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/wp-includes/ -> taxonomy.php (source)

   1  <?php
   2  /**
   3   * Core Taxonomy API
   4   *
   5   * @package WordPress
   6   * @subpackage Taxonomy
   7   */
   8  
   9  //
  10  // Taxonomy registration.
  11  //
  12  
  13  /**
  14   * Creates the initial taxonomies.
  15   *
  16   * This function fires twice: in wp-settings.php before plugins are loaded (for
  17   * backward compatibility reasons), and again on the {@see 'init'} action. We must
  18   * avoid registering rewrite rules before the {@see 'init'} action.
  19   *
  20   * @since 2.8.0
  21   * @since 5.9.0 Added `'wp_template_part_area'` taxonomy.
  22   *
  23   * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  24   */
  25  function create_initial_taxonomies() {
  26      global $wp_rewrite;
  27  
  28      WP_Taxonomy::reset_default_labels();
  29  
  30      if ( ! did_action( 'init' ) ) {
  31          $rewrite = array(
  32              'category'    => false,
  33              'post_tag'    => false,
  34              'post_format' => false,
  35          );
  36      } else {
  37  
  38          /**
  39           * Filters the post formats rewrite base.
  40           *
  41           * @since 3.1.0
  42           *
  43           * @param string $context Context of the rewrite base. Default 'type'.
  44           */
  45          $post_format_base = apply_filters( 'post_format_rewrite_base', 'type' );
  46          $rewrite          = array(
  47              'category'    => array(
  48                  'hierarchical' => true,
  49                  'slug'         => get_option( 'category_base' ) ? get_option( 'category_base' ) : 'category',
  50                  'with_front'   => ! get_option( 'category_base' ) || $wp_rewrite->using_index_permalinks(),
  51                  'ep_mask'      => EP_CATEGORIES,
  52              ),
  53              'post_tag'    => array(
  54                  'hierarchical' => false,
  55                  'slug'         => get_option( 'tag_base' ) ? get_option( 'tag_base' ) : 'tag',
  56                  'with_front'   => ! get_option( 'tag_base' ) || $wp_rewrite->using_index_permalinks(),
  57                  'ep_mask'      => EP_TAGS,
  58              ),
  59              'post_format' => $post_format_base ? array( 'slug' => $post_format_base ) : false,
  60          );
  61      }
  62  
  63      register_taxonomy(
  64          'category',
  65          'post',
  66          array(
  67              'hierarchical'          => true,
  68              'query_var'             => 'category_name',
  69              'rewrite'               => $rewrite['category'],
  70              'public'                => true,
  71              'show_ui'               => true,
  72              'show_admin_column'     => true,
  73              '_builtin'              => true,
  74              'capabilities'          => array(
  75                  'manage_terms' => 'manage_categories',
  76                  'edit_terms'   => 'edit_categories',
  77                  'delete_terms' => 'delete_categories',
  78                  'assign_terms' => 'assign_categories',
  79              ),
  80              'show_in_rest'          => true,
  81              'rest_base'             => 'categories',
  82              'rest_controller_class' => 'WP_REST_Terms_Controller',
  83          )
  84      );
  85  
  86      register_taxonomy(
  87          'post_tag',
  88          'post',
  89          array(
  90              'hierarchical'          => false,
  91              'query_var'             => 'tag',
  92              'rewrite'               => $rewrite['post_tag'],
  93              'public'                => true,
  94              'show_ui'               => true,
  95              'show_admin_column'     => true,
  96              '_builtin'              => true,
  97              'capabilities'          => array(
  98                  'manage_terms' => 'manage_post_tags',
  99                  'edit_terms'   => 'edit_post_tags',
 100                  'delete_terms' => 'delete_post_tags',
 101                  'assign_terms' => 'assign_post_tags',
 102              ),
 103              'show_in_rest'          => true,
 104              'rest_base'             => 'tags',
 105              'rest_controller_class' => 'WP_REST_Terms_Controller',
 106          )
 107      );
 108  
 109      register_taxonomy(
 110          'nav_menu',
 111          'nav_menu_item',
 112          array(
 113              'public'                => false,
 114              'hierarchical'          => false,
 115              'labels'                => array(
 116                  'name'          => __( 'Navigation Menus' ),
 117                  'singular_name' => __( 'Navigation Menu' ),
 118              ),
 119              'query_var'             => false,
 120              'rewrite'               => false,
 121              'show_ui'               => false,
 122              '_builtin'              => true,
 123              'show_in_nav_menus'     => false,
 124              'capabilities'          => array(
 125                  'manage_terms' => 'edit_theme_options',
 126                  'edit_terms'   => 'edit_theme_options',
 127                  'delete_terms' => 'edit_theme_options',
 128                  'assign_terms' => 'edit_theme_options',
 129              ),
 130              'show_in_rest'          => true,
 131              'rest_base'             => 'menus',
 132              'rest_controller_class' => 'WP_REST_Menus_Controller',
 133          )
 134      );
 135  
 136      register_taxonomy(
 137          'link_category',
 138          'link',
 139          array(
 140              'hierarchical' => false,
 141              'labels'       => array(
 142                  'name'                       => __( 'Link Categories' ),
 143                  'singular_name'              => __( 'Link Category' ),
 144                  'search_items'               => __( 'Search Link Categories' ),
 145                  'popular_items'              => null,
 146                  'all_items'                  => __( 'All Link Categories' ),
 147                  'edit_item'                  => __( 'Edit Link Category' ),
 148                  'update_item'                => __( 'Update Link Category' ),
 149                  'add_new_item'               => __( 'Add Link Category' ),
 150                  'new_item_name'              => __( 'New Link Category Name' ),
 151                  'separate_items_with_commas' => null,
 152                  'add_or_remove_items'        => null,
 153                  'choose_from_most_used'      => null,
 154                  'back_to_items'              => __( '&larr; Go to Link Categories' ),
 155              ),
 156              'capabilities' => array(
 157                  'manage_terms' => 'manage_links',
 158                  'edit_terms'   => 'manage_links',
 159                  'delete_terms' => 'manage_links',
 160                  'assign_terms' => 'manage_links',
 161              ),
 162              'query_var'    => false,
 163              'rewrite'      => false,
 164              'public'       => false,
 165              'show_ui'      => true,
 166              '_builtin'     => true,
 167          )
 168      );
 169  
 170      register_taxonomy(
 171          'post_format',
 172          'post',
 173          array(
 174              'public'            => true,
 175              'hierarchical'      => false,
 176              'labels'            => array(
 177                  'name'          => _x( 'Formats', 'post format' ),
 178                  'singular_name' => _x( 'Format', 'post format' ),
 179              ),
 180              'query_var'         => true,
 181              'rewrite'           => $rewrite['post_format'],
 182              'show_ui'           => false,
 183              '_builtin'          => true,
 184              'show_in_nav_menus' => current_theme_supports( 'post-formats' ),
 185          )
 186      );
 187  
 188      register_taxonomy(
 189          'wp_theme',
 190          array( 'wp_template', 'wp_template_part', 'wp_global_styles' ),
 191          array(
 192              'public'            => false,
 193              'hierarchical'      => false,
 194              'labels'            => array(
 195                  'name'          => __( 'Themes' ),
 196                  'singular_name' => __( 'Theme' ),
 197              ),
 198              'query_var'         => false,
 199              'rewrite'           => false,
 200              'show_ui'           => false,
 201              '_builtin'          => true,
 202              'show_in_nav_menus' => false,
 203              'show_in_rest'      => false,
 204          )
 205      );
 206  
 207      register_taxonomy(
 208          'wp_template_part_area',
 209          array( 'wp_template_part' ),
 210          array(
 211              'public'            => false,
 212              'hierarchical'      => false,
 213              'labels'            => array(
 214                  'name'          => __( 'Template Part Areas' ),
 215                  'singular_name' => __( 'Template Part Area' ),
 216              ),
 217              'query_var'         => false,
 218              'rewrite'           => false,
 219              'show_ui'           => false,
 220              '_builtin'          => true,
 221              'show_in_nav_menus' => false,
 222              'show_in_rest'      => false,
 223          )
 224      );
 225  
 226      register_taxonomy(
 227          'wp_pattern_category',
 228          array( 'wp_block' ),
 229          array(
 230              'public'             => false,
 231              'publicly_queryable' => false,
 232              'hierarchical'       => false,
 233              'labels'             => array(
 234                  'name'                       => _x( 'Pattern Categories', 'taxonomy general name' ),
 235                  'singular_name'              => _x( 'Pattern Category', 'taxonomy singular name' ),
 236                  'add_new_item'               => __( 'Add Category' ),
 237                  'add_or_remove_items'        => __( 'Add or remove pattern categories' ),
 238                  'back_to_items'              => __( '&larr; Go to Pattern Categories' ),
 239                  'choose_from_most_used'      => __( 'Choose from the most used pattern categories' ),
 240                  'edit_item'                  => __( 'Edit Pattern Category' ),
 241                  'item_link'                  => __( 'Pattern Category Link' ),
 242                  'item_link_description'      => __( 'A link to a pattern category.' ),
 243                  'items_list'                 => __( 'Pattern Categories list' ),
 244                  'items_list_navigation'      => __( 'Pattern Categories list navigation' ),
 245                  'new_item_name'              => __( 'New Pattern Category Name' ),
 246                  'no_terms'                   => __( 'No pattern categories' ),
 247                  'not_found'                  => __( 'No pattern categories found.' ),
 248                  'popular_items'              => __( 'Popular Pattern Categories' ),
 249                  'search_items'               => __( 'Search Pattern Categories' ),
 250                  'separate_items_with_commas' => __( 'Separate pattern categories with commas' ),
 251                  'update_item'                => __( 'Update Pattern Category' ),
 252                  'view_item'                  => __( 'View Pattern Category' ),
 253              ),
 254              'query_var'          => false,
 255              'rewrite'            => false,
 256              'show_ui'            => true,
 257              '_builtin'           => true,
 258              'show_in_nav_menus'  => false,
 259              'show_in_rest'       => true,
 260              'show_admin_column'  => true,
 261              'show_tagcloud'      => false,
 262          )
 263      );
 264  }
 265  
 266  /**
 267   * Retrieves a list of registered taxonomy names or objects.
 268   *
 269   * @since 3.0.0
 270   *
 271   * @global WP_Taxonomy[] $wp_taxonomies The registered taxonomies.
 272   *
 273   * @param array  $args     Optional. An array of `key => value` arguments to match against the taxonomy objects.
 274   *                         Default empty array.
 275   * @param string $output   Optional. The type of output to return in the array. Either 'names'
 276   *                         or 'objects'. Default 'names'.
 277   * @param string $operator Optional. The logical operation to perform. Accepts 'and' or 'or'. 'or' means only
 278   *                         one element from the array needs to match; 'and' means all elements must match.
 279   *                         Default 'and'.
 280   * @return string[]|WP_Taxonomy[] An array of taxonomy names or objects.
 281   */
 282  function get_taxonomies( $args = array(), $output = 'names', $operator = 'and' ) {
 283      global $wp_taxonomies;
 284  
 285      $field = ( 'names' === $output ) ? 'name' : false;
 286  
 287      return wp_filter_object_list( $wp_taxonomies, $args, $operator, $field );
 288  }
 289  
 290  /**
 291   * Returns the names or objects of the taxonomies which are registered for the requested object or object type,
 292   * such as a post object or post type name.
 293   *
 294   * Example:
 295   *
 296   *     $taxonomies = get_object_taxonomies( 'post' );
 297   *
 298   * This results in:
 299   *
 300   *     Array( 'category', 'post_tag' )
 301   *
 302   * @since 2.3.0
 303   *
 304   * @global WP_Taxonomy[] $wp_taxonomies The registered taxonomies.
 305   *
 306   * @param string|string[]|WP_Post $object_type Name of the type of taxonomy object, or an object (row from posts).
 307   * @param string                  $output      Optional. The type of output to return in the array. Accepts either
 308   *                                             'names' or 'objects'. Default 'names'.
 309   * @return string[]|WP_Taxonomy[] The names or objects of all taxonomies of `$object_type`.
 310   */
 311  function get_object_taxonomies( $object_type, $output = 'names' ) {
 312      global $wp_taxonomies;
 313  
 314      if ( is_object( $object_type ) ) {
 315          if ( 'attachment' === $object_type->post_type ) {
 316              return get_attachment_taxonomies( $object_type, $output );
 317          }
 318          $object_type = $object_type->post_type;
 319      }
 320  
 321      $object_type = (array) $object_type;
 322  
 323      $taxonomies = array();
 324      foreach ( (array) $wp_taxonomies as $tax_name => $tax_obj ) {
 325          if ( array_intersect( $object_type, (array) $tax_obj->object_type ) ) {
 326              if ( 'names' === $output ) {
 327                  $taxonomies[] = $tax_name;
 328              } else {
 329                  $taxonomies[ $tax_name ] = $tax_obj;
 330              }
 331          }
 332      }
 333  
 334      return $taxonomies;
 335  }
 336  
 337  /**
 338   * Retrieves the taxonomy object of $taxonomy.
 339   *
 340   * The get_taxonomy function will first check that the parameter string given
 341   * is a taxonomy object and if it is, it will return it.
 342   *
 343   * @since 2.3.0
 344   *
 345   * @global WP_Taxonomy[] $wp_taxonomies The registered taxonomies.
 346   *
 347   * @param string $taxonomy Name of taxonomy object to return.
 348   * @return WP_Taxonomy|false The taxonomy object or false if $taxonomy doesn't exist.
 349   */
 350  function get_taxonomy( $taxonomy ) {
 351      global $wp_taxonomies;
 352  
 353      if ( ! taxonomy_exists( $taxonomy ) ) {
 354          return false;
 355      }
 356  
 357      return $wp_taxonomies[ $taxonomy ];
 358  }
 359  
 360  /**
 361   * Determines whether the taxonomy name exists.
 362   *
 363   * Formerly is_taxonomy(), introduced in 2.3.0.
 364   *
 365   * For more information on this and similar theme functions, check out
 366   * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 367   * Conditional Tags} article in the Theme Developer Handbook.
 368   *
 369   * @since 3.0.0
 370   *
 371   * @global WP_Taxonomy[] $wp_taxonomies The registered taxonomies.
 372   *
 373   * @param string $taxonomy Name of taxonomy object.
 374   * @return bool Whether the taxonomy exists.
 375   */
 376  function taxonomy_exists( $taxonomy ) {
 377      global $wp_taxonomies;
 378  
 379      return is_string( $taxonomy ) && isset( $wp_taxonomies[ $taxonomy ] );
 380  }
 381  
 382  /**
 383   * Determines whether the taxonomy object is hierarchical.
 384   *
 385   * Checks to make sure that the taxonomy is an object first. Then Gets the
 386   * object, and finally returns the hierarchical value in the object.
 387   *
 388   * A false return value might also mean that the taxonomy does not exist.
 389   *
 390   * For more information on this and similar theme functions, check out
 391   * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 392   * Conditional Tags} article in the Theme Developer Handbook.
 393   *
 394   * @since 2.3.0
 395   *
 396   * @param string $taxonomy Name of taxonomy object.
 397   * @return bool Whether the taxonomy is hierarchical.
 398   */
 399  function is_taxonomy_hierarchical( $taxonomy ) {
 400      if ( ! taxonomy_exists( $taxonomy ) ) {
 401          return false;
 402      }
 403  
 404      $taxonomy = get_taxonomy( $taxonomy );
 405      return $taxonomy->hierarchical;
 406  }
 407  
 408  /**
 409   * Creates or modifies a taxonomy object.
 410   *
 411   * Note: Do not use before the {@see 'init'} hook.
 412   *
 413   * A simple function for creating or modifying a taxonomy object based on
 414   * the parameters given. If modifying an existing taxonomy object, note
 415   * that the `$object_type` value from the original registration will be
 416   * overwritten.
 417   *
 418   * @since 2.3.0
 419   * @since 4.2.0 Introduced `show_in_quick_edit` argument.
 420   * @since 4.4.0 The `show_ui` argument is now enforced on the term editing screen.
 421   * @since 4.4.0 The `public` argument now controls whether the taxonomy can be queried on the front end.
 422   * @since 4.5.0 Introduced `publicly_queryable` argument.
 423   * @since 4.7.0 Introduced `show_in_rest`, 'rest_base' and 'rest_controller_class'
 424   *              arguments to register the taxonomy in REST API.
 425   * @since 5.1.0 Introduced `meta_box_sanitize_cb` argument.
 426   * @since 5.4.0 Added the registered taxonomy object as a return value.
 427   * @since 5.5.0 Introduced `default_term` argument.
 428   * @since 5.9.0 Introduced `rest_namespace` argument.
 429   *
 430   * @global WP_Taxonomy[] $wp_taxonomies Registered taxonomies.
 431   *
 432   * @param string       $taxonomy    Taxonomy key. Must not exceed 32 characters and may only contain
 433   *                                  lowercase alphanumeric characters, dashes, and underscores. See sanitize_key().
 434   * @param array|string $object_type Object type or array of object types with which the taxonomy should be associated.
 435   * @param array|string $args        {
 436   *     Optional. Array or query string of arguments for registering a taxonomy.
 437   *
 438   *     @type string[]      $labels                An array of labels for this taxonomy. By default, Tag labels are
 439   *                                                used for non-hierarchical taxonomies, and Category labels are used
 440   *                                                for hierarchical taxonomies. See accepted values in
 441   *                                                get_taxonomy_labels(). Default empty array.
 442   *     @type string        $description           A short descriptive summary of what the taxonomy is for. Default empty.
 443   *     @type bool          $public                Whether a taxonomy is intended for use publicly either via
 444   *                                                the admin interface or by front-end users. The default settings
 445   *                                                of `$publicly_queryable`, `$show_ui`, and `$show_in_nav_menus`
 446   *                                                are inherited from `$public`.
 447   *     @type bool          $publicly_queryable    Whether the taxonomy is publicly queryable.
 448   *                                                If not set, the default is inherited from `$public`
 449   *     @type bool          $hierarchical          Whether the taxonomy is hierarchical. Default false.
 450   *     @type bool          $show_ui               Whether to generate and allow a UI for managing terms in this taxonomy in
 451   *                                                the admin. If not set, the default is inherited from `$public`
 452   *                                                (default true).
 453   *     @type bool          $show_in_menu          Whether to show the taxonomy in the admin menu. If true, the taxonomy is
 454   *                                                shown as a submenu of the object type menu. If false, no menu is shown.
 455   *                                                `$show_ui` must be true. If not set, default is inherited from `$show_ui`
 456   *                                                (default true).
 457   *     @type bool          $show_in_nav_menus     Makes this taxonomy available for selection in navigation menus. If not
 458   *                                                set, the default is inherited from `$public` (default true).
 459   *     @type bool          $show_in_rest          Whether to include the taxonomy in the REST API. Set this to true
 460   *                                                for the taxonomy to be available in the block editor.
 461   *     @type string        $rest_base             To change the base url of REST API route. Default is $taxonomy.
 462   *     @type string        $rest_namespace        To change the namespace URL of REST API route. Default is wp/v2.
 463   *     @type string        $rest_controller_class REST API Controller class name. Default is 'WP_REST_Terms_Controller'.
 464   *     @type bool          $show_tagcloud         Whether to list the taxonomy in the Tag Cloud Widget controls. If not set,
 465   *                                                the default is inherited from `$show_ui` (default true).
 466   *     @type bool          $show_in_quick_edit    Whether to show the taxonomy in the quick/bulk edit panel. It not set,
 467   *                                                the default is inherited from `$show_ui` (default true).
 468   *     @type bool          $show_admin_column     Whether to display a column for the taxonomy on its post type listing
 469   *                                                screens. Default false.
 470   *     @type bool|callable $meta_box_cb           Provide a callback function for the meta box display. If not set,
 471   *                                                post_categories_meta_box() is used for hierarchical taxonomies, and
 472   *                                                post_tags_meta_box() is used for non-hierarchical. If false, no meta
 473   *                                                box is shown.
 474   *     @type callable      $meta_box_sanitize_cb  Callback function for sanitizing taxonomy data saved from a meta
 475   *                                                box. If no callback is defined, an appropriate one is determined
 476   *                                                based on the value of `$meta_box_cb`.
 477   *     @type string[]      $capabilities {
 478   *         Array of capabilities for this taxonomy.
 479   *
 480   *         @type string $manage_terms Default 'manage_categories'.
 481   *         @type string $edit_terms   Default 'manage_categories'.
 482   *         @type string $delete_terms Default 'manage_categories'.
 483   *         @type string $assign_terms Default 'edit_posts'.
 484   *     }
 485   *     @type bool|array    $rewrite {
 486   *         Triggers the handling of rewrites for this taxonomy. Default true, using $taxonomy as slug. To prevent
 487   *         rewrite, set to false. To specify rewrite rules, an array can be passed with any of these keys:
 488   *
 489   *         @type string $slug         Customize the permastruct slug. Default `$taxonomy` key.
 490   *         @type bool   $with_front   Should the permastruct be prepended with WP_Rewrite::$front. Default true.
 491   *         @type bool   $hierarchical Either hierarchical rewrite tag or not. Default false.
 492   *         @type int    $ep_mask      Assign an endpoint mask. Default `EP_NONE`.
 493   *     }
 494   *     @type string|bool   $query_var             Sets the query var key for this taxonomy. Default `$taxonomy` key. If
 495   *                                                false, a taxonomy cannot be loaded at `?{query_var}={term_slug}`. If a
 496   *                                                string, the query `?{query_var}={term_slug}` will be valid.
 497   *     @type callable      $update_count_callback Works much like a hook, in that it will be called when the count is
 498   *                                                updated. Default _update_post_term_count() for taxonomies attached
 499   *                                                to post types, which confirms that the objects are published before
 500   *                                                counting them. Default _update_generic_term_count() for taxonomies
 501   *                                                attached to other object types, such as users.
 502   *     @type string|array  $default_term {
 503   *         Default term to be used for the taxonomy.
 504   *
 505   *         @type string $name         Name of default term.
 506   *         @type string $slug         Slug for default term. Default empty.
 507   *         @type string $description  Description for default term. Default empty.
 508   *     }
 509   *     @type bool          $sort                  Whether terms in this taxonomy should be sorted in the order they are
 510   *                                                provided to `wp_set_object_terms()`. Default null which equates to false.
 511   *     @type array         $args                  Array of arguments to automatically use inside `wp_get_object_terms()`
 512   *                                                for this taxonomy.
 513   *     @type bool          $_builtin              This taxonomy is a "built-in" taxonomy. INTERNAL USE ONLY!
 514   *                                                Default false.
 515   * }
 516   * @return WP_Taxonomy|WP_Error The registered taxonomy object on success, WP_Error object on failure.
 517   */
 518  function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
 519      global $wp_taxonomies;
 520  
 521      if ( ! is_array( $wp_taxonomies ) ) {
 522          $wp_taxonomies = array();
 523      }
 524  
 525      $args = wp_parse_args( $args );
 526  
 527      if ( empty( $taxonomy ) || strlen( $taxonomy ) > 32 ) {
 528          _doing_it_wrong( __FUNCTION__, __( 'Taxonomy names must be between 1 and 32 characters in length.' ), '4.2.0' );
 529          return new WP_Error( 'taxonomy_length_invalid', __( 'Taxonomy names must be between 1 and 32 characters in length.' ) );
 530      }
 531  
 532      $taxonomy_object = new WP_Taxonomy( $taxonomy, $object_type, $args );
 533      $taxonomy_object->add_rewrite_rules();
 534  
 535      $wp_taxonomies[ $taxonomy ] = $taxonomy_object;
 536  
 537      $taxonomy_object->add_hooks();
 538  
 539      // Add default term.
 540      if ( ! empty( $taxonomy_object->default_term ) ) {
 541          $term = term_exists( $taxonomy_object->default_term['name'], $taxonomy );
 542          if ( $term ) {
 543              update_option( 'default_term_' . $taxonomy_object->name, $term['term_id'] );
 544          } else {
 545              $term = wp_insert_term(
 546                  $taxonomy_object->default_term['name'],
 547                  $taxonomy,
 548                  array(
 549                      'slug'        => sanitize_title( $taxonomy_object->default_term['slug'] ),
 550                      'description' => $taxonomy_object->default_term['description'],
 551                  )
 552              );
 553  
 554              // Update `term_id` in options.
 555              if ( ! is_wp_error( $term ) ) {
 556                  update_option( 'default_term_' . $taxonomy_object->name, $term['term_id'] );
 557              }
 558          }
 559      }
 560  
 561      /**
 562       * Fires after a taxonomy is registered.
 563       *
 564       * @since 3.3.0
 565       *
 566       * @param string       $taxonomy    Taxonomy slug.
 567       * @param array|string $object_type Object type or array of object types.
 568       * @param array        $args        Array of taxonomy registration arguments.
 569       */
 570      do_action( 'registered_taxonomy', $taxonomy, $object_type, (array) $taxonomy_object );
 571  
 572      /**
 573       * Fires after a specific taxonomy is registered.
 574       *
 575       * The dynamic portion of the filter name, `$taxonomy`, refers to the taxonomy key.
 576       *
 577       * Possible hook names include:
 578       *
 579       *  - `registered_taxonomy_category`
 580       *  - `registered_taxonomy_post_tag`
 581       *
 582       * @since 6.0.0
 583       *
 584       * @param string       $taxonomy    Taxonomy slug.
 585       * @param array|string $object_type Object type or array of object types.
 586       * @param array        $args        Array of taxonomy registration arguments.
 587       */
 588      do_action( "registered_taxonomy_{$taxonomy}", $taxonomy, $object_type, (array) $taxonomy_object );
 589  
 590      return $taxonomy_object;
 591  }
 592  
 593  /**
 594   * Unregisters a taxonomy.
 595   *
 596   * Can not be used to unregister built-in taxonomies.
 597   *
 598   * @since 4.5.0
 599   *
 600   * @global WP_Taxonomy[] $wp_taxonomies List of taxonomies.
 601   *
 602   * @param string $taxonomy Taxonomy name.
 603   * @return true|WP_Error True on success, WP_Error on failure or if the taxonomy doesn't exist.
 604   */
 605  function unregister_taxonomy( $taxonomy ) {
 606      global $wp_taxonomies;
 607  
 608      if ( ! taxonomy_exists( $taxonomy ) ) {
 609          return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 610      }
 611  
 612      $taxonomy_object = get_taxonomy( $taxonomy );
 613  
 614      // Do not allow unregistering internal taxonomies.
 615      if ( $taxonomy_object->_builtin ) {
 616          return new WP_Error( 'invalid_taxonomy', __( 'Unregistering a built-in taxonomy is not allowed.' ) );
 617      }
 618  
 619      $taxonomy_object->remove_rewrite_rules();
 620      $taxonomy_object->remove_hooks();
 621  
 622      // Remove the taxonomy.
 623      unset( $wp_taxonomies[ $taxonomy ] );
 624  
 625      /**
 626       * Fires after a taxonomy is unregistered.
 627       *
 628       * @since 4.5.0
 629       *
 630       * @param string $taxonomy Taxonomy name.
 631       */
 632      do_action( 'unregistered_taxonomy', $taxonomy );
 633  
 634      return true;
 635  }
 636  
 637  /**
 638   * Builds an object with all taxonomy labels out of a taxonomy object.
 639   *
 640   * @since 3.0.0
 641   * @since 4.3.0 Added the `no_terms` label.
 642   * @since 4.4.0 Added the `items_list_navigation` and `items_list` labels.
 643   * @since 4.9.0 Added the `most_used` and `back_to_items` labels.
 644   * @since 5.7.0 Added the `filter_by_item` label.
 645   * @since 5.8.0 Added the `item_link` and `item_link_description` labels.
 646   * @since 5.9.0 Added the `name_field_description`, `slug_field_description`,
 647   *              `parent_field_description`, and `desc_field_description` labels.
 648   * @since 6.6.0 Added the `template_name` label.
 649   *
 650   * @param WP_Taxonomy $tax Taxonomy object.
 651   * @return object {
 652   *     Taxonomy labels object. The first default value is for non-hierarchical taxonomies
 653   *     (like tags) and the second one is for hierarchical taxonomies (like categories).
 654   *
 655   *     @type string $name                       General name for the taxonomy, usually plural. The same
 656   *                                              as and overridden by `$tax->label`. Default 'Tags'/'Categories'.
 657   *     @type string $singular_name              Name for one object of this taxonomy. Default 'Tag'/'Category'.
 658   *     @type string $search_items               Default 'Search Tags'/'Search Categories'.
 659   *     @type string $popular_items              This label is only used for non-hierarchical taxonomies.
 660   *                                              Default 'Popular Tags'.
 661   *     @type string $all_items                  Default 'All Tags'/'All Categories'.
 662   *     @type string $parent_item                This label is only used for hierarchical taxonomies. Default
 663   *                                              'Parent Category'.
 664   *     @type string $parent_item_colon          The same as `parent_item`, but with colon `:` in the end.
 665   *     @type string $name_field_description     Description for the Name field on Edit Tags screen.
 666   *                                              Default 'The name is how it appears on your site'.
 667   *     @type string $slug_field_description     Description for the Slug field on Edit Tags screen.
 668   *                                              Default 'The &#8220;slug&#8221; is the URL-friendly version
 669   *                                              of the name. It is usually all lowercase and contains
 670   *                                              only letters, numbers, and hyphens'.
 671   *     @type string $parent_field_description   Description for the Parent field on Edit Tags screen.
 672   *                                              Default 'Assign a parent term to create a hierarchy.
 673   *                                              The term Jazz, for example, would be the parent
 674   *                                              of Bebop and Big Band'.
 675   *     @type string $desc_field_description     Description for the Description field on Edit Tags screen.
 676   *                                              Default 'The description is not prominent by default;
 677   *                                              however, some themes may show it'.
 678   *     @type string $edit_item                  Default 'Edit Tag'/'Edit Category'.
 679   *     @type string $view_item                  Default 'View Tag'/'View Category'.
 680   *     @type string $update_item                Default 'Update Tag'/'Update Category'.
 681   *     @type string $add_new_item               Default 'Add Tag'/'Add Category'.
 682   *     @type string $new_item_name              Default 'New Tag Name'/'New Category Name'.
 683   *     @type string $template_name              Default 'Tag Archives'/'Category Archives'.
 684   *     @type string $separate_items_with_commas This label is only used for non-hierarchical taxonomies. Default
 685   *                                              'Separate tags with commas', used in the meta box.
 686   *     @type string $add_or_remove_items        This label is only used for non-hierarchical taxonomies. Default
 687   *                                              'Add or remove tags', used in the meta box when JavaScript
 688   *                                              is disabled.
 689   *     @type string $choose_from_most_used      This label is only used on non-hierarchical taxonomies. Default
 690   *                                              'Choose from the most used tags', used in the meta box.
 691   *     @type string $not_found                  Default 'No tags found'/'No categories found', used in
 692   *                                              the meta box and taxonomy list table.
 693   *     @type string $no_terms                   Default 'No tags'/'No categories', used in the posts and media
 694   *                                              list tables.
 695   *     @type string $filter_by_item             This label is only used for hierarchical taxonomies. Default
 696   *                                              'Filter by category', used in the posts list table.
 697   *     @type string $items_list_navigation      Label for the table pagination hidden heading.
 698   *     @type string $items_list                 Label for the table hidden heading.
 699   *     @type string $most_used                  Title for the Most Used tab. Default 'Most Used'.
 700   *     @type string $back_to_items              Label displayed after a term has been updated.
 701   *     @type string $item_link                  Used in the block editor. Title for a navigation link block variation.
 702   *                                              Default 'Tag Link'/'Category Link'.
 703   *     @type string $item_link_description      Used in the block editor. Description for a navigation link block
 704   *                                              variation. Default 'A link to a tag'/'A link to a category'.
 705   * }
 706   */
 707  function get_taxonomy_labels( $tax ) {
 708      $tax->labels = (array) $tax->labels;
 709  
 710      if ( isset( $tax->helps ) && empty( $tax->labels['separate_items_with_commas'] ) ) {
 711          $tax->labels['separate_items_with_commas'] = $tax->helps;
 712      }
 713  
 714      if ( isset( $tax->no_tagcloud ) && empty( $tax->labels['not_found'] ) ) {
 715          $tax->labels['not_found'] = $tax->no_tagcloud;
 716      }
 717  
 718      $nohier_vs_hier_defaults = WP_Taxonomy::get_default_labels();
 719  
 720      $nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];
 721  
 722      $labels = _get_custom_object_labels( $tax, $nohier_vs_hier_defaults );
 723  
 724      if ( ! isset( $tax->labels->template_name ) && isset( $labels->singular_name ) ) {
 725          /* translators: %s: Taxonomy name. */
 726          $labels->template_name = sprintf( _x( '%s Archives', 'taxonomy template name' ), $labels->singular_name );
 727      }
 728  
 729      $taxonomy = $tax->name;
 730  
 731      $default_labels = clone $labels;
 732  
 733      /**
 734       * Filters the labels of a specific taxonomy.
 735       *
 736       * The dynamic portion of the hook name, `$taxonomy`, refers to the taxonomy slug.
 737       *
 738       * Possible hook names include:
 739       *
 740       *  - `taxonomy_labels_category`
 741       *  - `taxonomy_labels_post_tag`
 742       *
 743       * @since 4.4.0
 744       *
 745       * @see get_taxonomy_labels() for the full list of taxonomy labels.
 746       *
 747       * @param object $labels Object with labels for the taxonomy as member variables.
 748       */
 749      $labels = apply_filters( "taxonomy_labels_{$taxonomy}", $labels );
 750  
 751      // Ensure that the filtered labels contain all required default values.
 752      $labels = (object) array_merge( (array) $default_labels, (array) $labels );
 753  
 754      return $labels;
 755  }
 756  
 757  /**
 758   * Adds an already registered taxonomy to an object type.
 759   *
 760   * @since 3.0.0
 761   *
 762   * @global WP_Taxonomy[] $wp_taxonomies The registered taxonomies.
 763   *
 764   * @param string $taxonomy    Name of taxonomy object.
 765   * @param string $object_type Name of the object type.
 766   * @return bool True if successful, false if not.
 767   */
 768  function register_taxonomy_for_object_type( $taxonomy, $object_type ) {
 769      global $wp_taxonomies;
 770  
 771      if ( ! isset( $wp_taxonomies[ $taxonomy ] ) ) {
 772          return false;
 773      }
 774  
 775      if ( ! get_post_type_object( $object_type ) ) {
 776          return false;
 777      }
 778  
 779      if ( ! in_array( $object_type, $wp_taxonomies[ $taxonomy ]->object_type, true ) ) {
 780          $wp_taxonomies[ $taxonomy ]->object_type[] = $object_type;
 781      }
 782  
 783      // Filter out empties.
 784      $wp_taxonomies[ $taxonomy ]->object_type = array_filter( $wp_taxonomies[ $taxonomy ]->object_type );
 785  
 786      /**
 787       * Fires after a taxonomy is registered for an object type.
 788       *
 789       * @since 5.1.0
 790       *
 791       * @param string $taxonomy    Taxonomy name.
 792       * @param string $object_type Name of the object type.
 793       */
 794      do_action( 'registered_taxonomy_for_object_type', $taxonomy, $object_type );
 795  
 796      return true;
 797  }
 798  
 799  /**
 800   * Removes an already registered taxonomy from an object type.
 801   *
 802   * @since 3.7.0
 803   *
 804   * @global WP_Taxonomy[] $wp_taxonomies The registered taxonomies.
 805   *
 806   * @param string $taxonomy    Name of taxonomy object.
 807   * @param string $object_type Name of the object type.
 808   * @return bool True if successful, false if not.
 809   */
 810  function unregister_taxonomy_for_object_type( $taxonomy, $object_type ) {
 811      global $wp_taxonomies;
 812  
 813      if ( ! isset( $wp_taxonomies[ $taxonomy ] ) ) {
 814          return false;
 815      }
 816  
 817      if ( ! get_post_type_object( $object_type ) ) {
 818          return false;
 819      }
 820  
 821      $key = array_search( $object_type, $wp_taxonomies[ $taxonomy ]->object_type, true );
 822      if ( false === $key ) {
 823          return false;
 824      }
 825  
 826      unset( $wp_taxonomies[ $taxonomy ]->object_type[ $key ] );
 827  
 828      /**
 829       * Fires after a taxonomy is unregistered for an object type.
 830       *
 831       * @since 5.1.0
 832       *
 833       * @param string $taxonomy    Taxonomy name.
 834       * @param string $object_type Name of the object type.
 835       */
 836      do_action( 'unregistered_taxonomy_for_object_type', $taxonomy, $object_type );
 837  
 838      return true;
 839  }
 840  
 841  //
 842  // Term API.
 843  //
 844  
 845  /**
 846   * Retrieves object IDs of valid taxonomy and term.
 847   *
 848   * The strings of `$taxonomies` must exist before this function will continue.
 849   * On failure of finding a valid taxonomy, it will return a WP_Error.
 850   *
 851   * The `$terms` aren't checked the same as `$taxonomies`, but still need to exist
 852   * for object IDs to be returned.
 853   *
 854   * It is possible to change the order that object IDs are returned by using `$args`
 855   * with either ASC or DESC array. The value should be in the key named 'order'.
 856   *
 857   * @since 2.3.0
 858   *
 859   * @global wpdb $wpdb WordPress database abstraction object.
 860   *
 861   * @param int|int[]       $term_ids   Term ID or array of term IDs of terms that will be used.
 862   * @param string|string[] $taxonomies String of taxonomy name or Array of string values of taxonomy names.
 863   * @param array|string    $args       {
 864   *     Change the order of the object IDs.
 865   *
 866   *     @type string $order Order to retrieve terms. Accepts 'ASC' or 'DESC'. Default 'ASC'.
 867   * }
 868   * @return string[]|WP_Error An array of object IDs as numeric strings on success,
 869   *                           WP_Error if the taxonomy does not exist.
 870   */
 871  function get_objects_in_term( $term_ids, $taxonomies, $args = array() ) {
 872      global $wpdb;
 873  
 874      if ( ! is_array( $term_ids ) ) {
 875          $term_ids = array( $term_ids );
 876      }
 877      if ( ! is_array( $taxonomies ) ) {
 878          $taxonomies = array( $taxonomies );
 879      }
 880      foreach ( (array) $taxonomies as $taxonomy ) {
 881          if ( ! taxonomy_exists( $taxonomy ) ) {
 882              return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 883          }
 884      }
 885  
 886      $defaults = array( 'order' => 'ASC' );
 887      $args     = wp_parse_args( $args, $defaults );
 888  
 889      $order = ( 'desc' === strtolower( $args['order'] ) ) ? 'DESC' : 'ASC';
 890  
 891      $term_ids = array_map( 'intval', $term_ids );
 892  
 893      $taxonomies = "'" . implode( "', '", array_map( 'esc_sql', $taxonomies ) ) . "'";
 894      $term_ids   = "'" . implode( "', '", $term_ids ) . "'";
 895  
 896      $sql = "SELECT tr.object_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ($taxonomies) AND tt.term_id IN ($term_ids) ORDER BY tr.object_id $order";
 897  
 898      $last_changed = wp_cache_get_last_changed( 'terms' );
 899      $cache_key    = 'get_objects_in_term:' . md5( $sql ) . ":$last_changed";
 900      $cache        = wp_cache_get( $cache_key, 'term-queries' );
 901      if ( false === $cache ) {
 902          $object_ids = $wpdb->get_col( $sql );
 903          wp_cache_set( $cache_key, $object_ids, 'term-queries' );
 904      } else {
 905          $object_ids = (array) $cache;
 906      }
 907  
 908      if ( ! $object_ids ) {
 909          return array();
 910      }
 911      return $object_ids;
 912  }
 913  
 914  /**
 915   * Given a taxonomy query, generates SQL to be appended to a main query.
 916   *
 917   * @since 3.1.0
 918   *
 919   * @see WP_Tax_Query
 920   *
 921   * @param array  $tax_query         A compact tax query
 922   * @param string $primary_table
 923   * @param string $primary_id_column
 924   * @return string[]
 925   */
 926  function get_tax_sql( $tax_query, $primary_table, $primary_id_column ) {
 927      $tax_query_obj = new WP_Tax_Query( $tax_query );
 928      return $tax_query_obj->get_sql( $primary_table, $primary_id_column );
 929  }
 930  
 931  /**
 932   * Gets all term data from database by term ID.
 933   *
 934   * The usage of the get_term function is to apply filters to a term object. It
 935   * is possible to get a term object from the database before applying the
 936   * filters.
 937   *
 938   * $term ID must be part of $taxonomy, to get from the database. Failure, might
 939   * be able to be captured by the hooks. Failure would be the same value as $wpdb
 940   * returns for the get_row method.
 941   *
 942   * There are two hooks, one is specifically for each term, named 'get_term', and
 943   * the second is for the taxonomy name, 'term_$taxonomy'. Both hooks gets the
 944   * term object, and the taxonomy name as parameters. Both hooks are expected to
 945   * return a term object.
 946   *
 947   * {@see 'get_term'} hook - Takes two parameters the term Object and the taxonomy name.
 948   * Must return term object. Used in get_term() as a catch-all filter for every
 949   * $term.
 950   *
 951   * {@see 'get_$taxonomy'} hook - Takes two parameters the term Object and the taxonomy
 952   * name. Must return term object. $taxonomy will be the taxonomy name, so for
 953   * example, if 'category', it would be 'get_category' as the filter name. Useful
 954   * for custom taxonomies or plugging into default taxonomies.
 955   *
 956   * @todo Better formatting for DocBlock
 957   *
 958   * @since 2.3.0
 959   * @since 4.4.0 Converted to return a WP_Term object if `$output` is `OBJECT`.
 960   *              The `$taxonomy` parameter was made optional.
 961   *
 962   * @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.
 963   *
 964   * @param int|WP_Term|object $term     If integer, term data will be fetched from the database,
 965   *                                     or from the cache if available.
 966   *                                     If stdClass object (as in the results of a database query),
 967   *                                     will apply filters and return a `WP_Term` object with the `$term` data.
 968   *                                     If `WP_Term`, will return `$term`.
 969   * @param string             $taxonomy Optional. Taxonomy name that `$term` is part of.
 970   * @param string             $output   Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
 971   *                                     correspond to a WP_Term object, an associative array, or a numeric array,
 972   *                                     respectively. Default OBJECT.
 973   * @param string             $filter   Optional. How to sanitize term fields. Default 'raw'.
 974   * @return WP_Term|array|WP_Error|null WP_Term instance (or array) on success, depending on the `$output` value.
 975   *                                     WP_Error if `$taxonomy` does not exist. Null for miscellaneous failure.
 976   */
 977  function get_term( $term, $taxonomy = '', $output = OBJECT, $filter = 'raw' ) {
 978      if ( empty( $term ) ) {
 979          return new WP_Error( 'invalid_term', __( 'Empty Term.' ) );
 980      }
 981  
 982      if ( $taxonomy && ! taxonomy_exists( $taxonomy ) ) {
 983          return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
 984      }
 985  
 986      if ( $term instanceof WP_Term ) {
 987          $_term = $term;
 988      } elseif ( is_object( $term ) ) {
 989          if ( empty( $term->filter ) || 'raw' === $term->filter ) {
 990              $_term = sanitize_term( $term, $taxonomy, 'raw' );
 991              $_term = new WP_Term( $_term );
 992          } else {
 993              $_term = WP_Term::get_instance( $term->term_id );
 994          }
 995      } else {
 996          $_term = WP_Term::get_instance( $term, $taxonomy );
 997      }
 998  
 999      if ( is_wp_error( $_term ) ) {
1000          return $_term;
1001      } elseif ( ! $_term ) {
1002          return null;
1003      }
1004  
1005      // Ensure for filters that this is not empty.
1006      $taxonomy = $_term->taxonomy;
1007  
1008      $old_term = $_term;
1009      /**
1010       * Filters a taxonomy term object.
1011       *
1012       * The {@see 'get_$taxonomy'} hook is also available for targeting a specific
1013       * taxonomy.
1014       *
1015       * @since 2.3.0
1016       * @since 4.4.0 `$_term` is now a `WP_Term` object.
1017       *
1018       * @param WP_Term $_term    Term object.
1019       * @param string  $taxonomy The taxonomy slug.
1020       */
1021      $_term = apply_filters( 'get_term', $_term, $taxonomy );
1022  
1023      /**
1024       * Filters a taxonomy term object.
1025       *
1026       * The dynamic portion of the hook name, `$taxonomy`, refers
1027       * to the slug of the term's taxonomy.
1028       *
1029       * Possible hook names include:
1030       *
1031       *  - `get_category`
1032       *  - `get_post_tag`
1033       *
1034       * @since 2.3.0
1035       * @since 4.4.0 `$_term` is now a `WP_Term` object.
1036       *
1037       * @param WP_Term $_term    Term object.
1038       * @param string  $taxonomy The taxonomy slug.
1039       */
1040      $_term = apply_filters( "get_{$taxonomy}", $_term, $taxonomy );
1041  
1042      // Bail if a filter callback has changed the type of the `$_term` object.
1043      if ( ! ( $_term instanceof WP_Term ) ) {
1044          return $_term;
1045      }
1046  
1047      // Sanitize term, according to the specified filter.
1048      if ( $_term !== $old_term || $_term->filter !== $filter ) {
1049          $_term->filter( $filter );
1050      }
1051  
1052      if ( ARRAY_A === $output ) {
1053          return $_term->to_array();
1054      } elseif ( ARRAY_N === $output ) {
1055          return array_values( $_term->to_array() );
1056      }
1057  
1058      return $_term;
1059  }
1060  
1061  /**
1062   * Gets all term data from database by term field and data.
1063   *
1064   * Warning: $value is not escaped for 'name' $field. You must do it yourself, if
1065   * required.
1066   *
1067   * The default $field is 'id', therefore it is possible to also use null for
1068   * field, but not recommended that you do so.
1069   *
1070   * If $value does not exist, the return value will be false. If $taxonomy exists
1071   * and $field and $value combinations exist, the term will be returned.
1072   *
1073   * This function will always return the first term that matches the `$field`-
1074   * `$value`-`$taxonomy` combination specified in the parameters. If your query
1075   * is likely to match more than one term (as is likely to be the case when
1076   * `$field` is 'name', for example), consider using get_terms() instead; that
1077   * way, you will get all matching terms, and can provide your own logic for
1078   * deciding which one was intended.
1079   *
1080   * @todo Better formatting for DocBlock.
1081   *
1082   * @since 2.3.0
1083   * @since 4.4.0 `$taxonomy` is optional if `$field` is 'term_taxonomy_id'. Converted to return
1084   *              a WP_Term object if `$output` is `OBJECT`.
1085   * @since 5.5.0 Added 'ID' as an alias of 'id' for the `$field` parameter.
1086   *
1087   * @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.
1088   *
1089   * @param string     $field    Either 'slug', 'name', 'term_id' (or 'id', 'ID'), or 'term_taxonomy_id'.
1090   * @param string|int $value    Search for this term value.
1091   * @param string     $taxonomy Taxonomy name. Optional, if `$field` is 'term_taxonomy_id'.
1092   * @param string     $output   Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
1093   *                             correspond to a WP_Term object, an associative array, or a numeric array,
1094   *                             respectively. Default OBJECT.
1095   * @param string     $filter   Optional. How to sanitize term fields. Default 'raw'.
1096   * @return WP_Term|array|false WP_Term instance (or array) on success, depending on the `$output` value.
1097   *                             False if `$taxonomy` does not exist or `$term` was not found.
1098   */
1099  function get_term_by( $field, $value, $taxonomy = '', $output = OBJECT, $filter = 'raw' ) {
1100  
1101      // 'term_taxonomy_id' lookups don't require taxonomy checks.
1102      if ( 'term_taxonomy_id' !== $field && ! taxonomy_exists( $taxonomy ) ) {
1103          return false;
1104      }
1105  
1106      // No need to perform a query for empty 'slug' or 'name'.
1107      if ( 'slug' === $field || 'name' === $field ) {
1108          $value = (string) $value;
1109  
1110          if ( 0 === strlen( $value ) ) {
1111              return false;
1112          }
1113      }
1114  
1115      if ( 'id' === $field || 'ID' === $field || 'term_id' === $field ) {
1116          $term = get_term( (int) $value, $taxonomy, $output, $filter );
1117          if ( is_wp_error( $term ) || null === $term ) {
1118              $term = false;
1119          }
1120          return $term;
1121      }
1122  
1123      $args = array(
1124          'get'                    => 'all',
1125          'number'                 => 1,
1126          'taxonomy'               => $taxonomy,
1127          'update_term_meta_cache' => false,
1128          'orderby'                => 'none',
1129          'suppress_filter'        => true,
1130      );
1131  
1132      switch ( $field ) {
1133          case 'slug':
1134              $args['slug'] = $value;
1135              break;
1136          case 'name':
1137              $args['name'] = $value;
1138              break;
1139          case 'term_taxonomy_id':
1140              $args['term_taxonomy_id'] = $value;
1141              unset( $args['taxonomy'] );
1142              break;
1143          default:
1144              return false;
1145      }
1146  
1147      $terms = get_terms( $args );
1148      if ( is_wp_error( $terms ) || empty( $terms ) ) {
1149          return false;
1150      }
1151  
1152      $term = array_shift( $terms );
1153  
1154      // In the case of 'term_taxonomy_id', override the provided `$taxonomy` with whatever we find in the DB.
1155      if ( 'term_taxonomy_id' === $field ) {
1156          $taxonomy = $term->taxonomy;
1157      }
1158  
1159      return get_term( $term, $taxonomy, $output, $filter );
1160  }
1161  
1162  /**
1163   * Merges all term children into a single array of their IDs.
1164   *
1165   * This recursive function will merge all of the children of $term into the same
1166   * array of term IDs. Only useful for taxonomies which are hierarchical.
1167   *
1168   * Will return an empty array if $term does not exist in $taxonomy.
1169   *
1170   * @since 2.3.0
1171   *
1172   * @param int    $term_id  ID of term to get children.
1173   * @param string $taxonomy Taxonomy name.
1174   * @return array|WP_Error List of term IDs. WP_Error returned if `$taxonomy` does not exist.
1175   */
1176  function get_term_children( $term_id, $taxonomy ) {
1177      if ( ! taxonomy_exists( $taxonomy ) ) {
1178          return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
1179      }
1180  
1181      $term_id = (int) $term_id;
1182  
1183      $terms = _get_term_hierarchy( $taxonomy );
1184  
1185      if ( ! isset( $terms[ $term_id ] ) ) {
1186          return array();
1187      }
1188  
1189      $children = $terms[ $term_id ];
1190  
1191      foreach ( (array) $terms[ $term_id ] as $child ) {
1192          if ( $term_id === $child ) {
1193              continue;
1194          }
1195  
1196          if ( isset( $terms[ $child ] ) ) {
1197              $children = array_merge( $children, get_term_children( $child, $taxonomy ) );
1198          }
1199      }
1200  
1201      return $children;
1202  }
1203  
1204  /**
1205   * Gets sanitized term field.
1206   *
1207   * The function is for contextual reasons and for simplicity of usage.
1208   *
1209   * @since 2.3.0
1210   * @since 4.4.0 The `$taxonomy` parameter was made optional. `$term` can also now accept a WP_Term object.
1211   *
1212   * @see sanitize_term_field()
1213   *
1214   * @param string      $field    Term field to fetch.
1215   * @param int|WP_Term $term     Term ID or object.
1216   * @param string      $taxonomy Optional. Taxonomy name. Default empty.
1217   * @param string      $context  Optional. How to sanitize term fields. Look at sanitize_term_field() for available options.
1218   *                              Default 'display'.
1219   * @return string|int|null|WP_Error Will return an empty string if $term is not an object or if $field is not set in $term.
1220   */
1221  function get_term_field( $field, $term, $taxonomy = '', $context = 'display' ) {
1222      $term = get_term( $term, $taxonomy );
1223      if ( is_wp_error( $term ) ) {
1224          return $term;
1225      }
1226  
1227      if ( ! is_object( $term ) ) {
1228          return '';
1229      }
1230  
1231      if ( ! isset( $term->$field ) ) {
1232          return '';
1233      }
1234  
1235      return sanitize_term_field( $field, $term->$field, $term->term_id, $term->taxonomy, $context );
1236  }
1237  
1238  /**
1239   * Sanitizes term for editing.
1240   *
1241   * Return value is sanitize_term() and usage is for sanitizing the term for
1242   * editing. Function is for contextual and simplicity.
1243   *
1244   * @since 2.3.0
1245   *
1246   * @param int|object $id       Term ID or object.
1247   * @param string     $taxonomy Taxonomy name.
1248   * @return string|int|null|WP_Error Will return empty string if $term is not an object.
1249   */
1250  function get_term_to_edit( $id, $taxonomy ) {
1251      $term = get_term( $id, $taxonomy );
1252  
1253      if ( is_wp_error( $term ) ) {
1254          return $term;
1255      }
1256  
1257      if ( ! is_object( $term ) ) {
1258          return '';
1259      }
1260  
1261      return sanitize_term( $term, $taxonomy, 'edit' );
1262  }
1263  
1264  /**
1265   * Retrieves the terms in a given taxonomy or list of taxonomies.
1266   *
1267   * You can fully inject any customizations to the query before it is sent, as
1268   * well as control the output with a filter.
1269   *
1270   * The return type varies depending on the value passed to `$args['fields']`. See
1271   * WP_Term_Query::get_terms() for details. In all cases, a `WP_Error` object will
1272   * be returned if an invalid taxonomy is requested.
1273   *
1274   * The {@see 'get_terms'} filter will be called when the cache has the term and will
1275   * pass the found term along with the array of $taxonomies and array of $args.
1276   * This filter is also called before the array of terms is passed and will pass
1277   * the array of terms, along with the $taxonomies and $args.
1278   *
1279   * The {@see 'list_terms_exclusions'} filter passes the compiled exclusions along with
1280   * the $args.
1281   *
1282   * The {@see 'get_terms_orderby'} filter passes the `ORDER BY` clause for the query
1283   * along with the $args array.
1284   *
1285   * Taxonomy or an array of taxonomies should be passed via the 'taxonomy' argument
1286   * in the `$args` array:
1287   *
1288   *     $terms = get_terms( array(
1289   *         'taxonomy'   => 'post_tag',
1290   *         'hide_empty' => false,
1291   *     ) );
1292   *
1293   * Prior to 4.5.0, taxonomy was passed as the first parameter of `get_terms()`.
1294   *
1295   * {@internal The `$deprecated` parameter is parsed for backward compatibility only.}
1296   *
1297   * @since 2.3.0
1298   * @since 4.2.0 Introduced 'name' and 'childless' parameters.
1299   * @since 4.4.0 Introduced the ability to pass 'term_id' as an alias of 'id' for the `orderby` parameter.
1300   *              Introduced the 'meta_query' and 'update_term_meta_cache' parameters. Converted to return
1301   *              a list of WP_Term objects.
1302   * @since 4.5.0 Changed the function signature so that the `$args` array can be provided as the first parameter.
1303   *              Introduced 'meta_key' and 'meta_value' parameters. Introduced the ability to order results by metadata.
1304   * @since 4.8.0 Introduced 'suppress_filter' parameter.
1305   *
1306   * @param array|string $args       Optional. Array or string of arguments. See WP_Term_Query::__construct()
1307   *                                 for information on accepted arguments. Default empty array.
1308   * @param array|string $deprecated Optional. Argument array, when using the legacy function parameter format.
1309   *                                 If present, this parameter will be interpreted as `$args`, and the first
1310   *                                 function parameter will be parsed as a taxonomy or array of taxonomies.
1311   *                                 Default empty.
1312   * @return WP_Term[]|int[]|string[]|string|WP_Error Array of terms, a count thereof as a numeric string,
1313   *                                                  or WP_Error if any of the taxonomies do not exist.
1314   *                                                  See the function description for more information.
1315   */
1316  function get_terms( $args = array(), $deprecated = '' ) {
1317      $term_query = new WP_Term_Query();
1318  
1319      $defaults = array(
1320          'suppress_filter' => false,
1321      );
1322  
1323      /*
1324       * Legacy argument format ($taxonomy, $args) takes precedence.
1325       *
1326       * We detect legacy argument format by checking if
1327       * (a) a second non-empty parameter is passed, or
1328       * (b) the first parameter shares no keys with the default array (ie, it's a list of taxonomies)
1329       */
1330      $_args          = wp_parse_args( $args );
1331      $key_intersect  = array_intersect_key( $term_query->query_var_defaults, (array) $_args );
1332      $do_legacy_args = $deprecated || empty( $key_intersect );
1333  
1334      if ( $do_legacy_args ) {
1335          $taxonomies       = (array) $args;
1336          $args             = wp_parse_args( $deprecated, $defaults );
1337          $args['taxonomy'] = $taxonomies;
1338      } else {
1339          $args = wp_parse_args( $args, $defaults );
1340          if ( isset( $args['taxonomy'] ) && null !== $args['taxonomy'] ) {
1341              $args['taxonomy'] = (array) $args['taxonomy'];
1342          }
1343      }
1344  
1345      if ( ! empty( $args['taxonomy'] ) ) {
1346          foreach ( $args['taxonomy'] as $taxonomy ) {
1347              if ( ! taxonomy_exists( $taxonomy ) ) {
1348                  return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
1349              }
1350          }
1351      }
1352  
1353      // Don't pass suppress_filter to WP_Term_Query.
1354      $suppress_filter = $args['suppress_filter'];
1355      unset( $args['suppress_filter'] );
1356  
1357      $terms = $term_query->query( $args );
1358  
1359      // Count queries are not filtered, for legacy reasons.
1360      if ( ! is_array( $terms ) ) {
1361          return $terms;
1362      }
1363  
1364      if ( $suppress_filter ) {
1365          return $terms;
1366      }
1367  
1368      /**
1369       * Filters the found terms.
1370       *
1371       * @since 2.3.0
1372       * @since 4.6.0 Added the `$term_query` parameter.
1373       *
1374       * @param array         $terms      Array of found terms.
1375       * @param array|null    $taxonomies An array of taxonomies if known.
1376       * @param array         $args       An array of get_terms() arguments.
1377       * @param WP_Term_Query $term_query The WP_Term_Query object.
1378       */
1379      return apply_filters( 'get_terms', $terms, $term_query->query_vars['taxonomy'], $term_query->query_vars, $term_query );
1380  }
1381  
1382  /**
1383   * Adds metadata to a term.
1384   *
1385   * For historical reasons both the meta key and the meta value are expected to be "slashed" (slashes escaped) on input.
1386   *
1387   * @since 4.4.0
1388   *
1389   * @param int    $term_id    Term ID.
1390   * @param string $meta_key   Metadata name.
1391   * @param mixed  $meta_value Metadata value. Arrays and objects are stored as serialized data and
1392   *                           will be returned as the same type when retrieved. Other data types will
1393   *                           be stored as strings in the database:
1394   *                           - false is stored and retrieved as an empty string ('')
1395   *                           - true is stored and retrieved as '1'
1396   *                           - numbers (both integer and float) are stored and retrieved as strings
1397   *                           Must be serializable if non-scalar.
1398   * @param bool   $unique     Optional. Whether the same key should not be added.
1399   *                           Default false.
1400   * @return int|false|WP_Error Meta ID on success, false on failure.
1401   *                            WP_Error when term_id is ambiguous between taxonomies.
1402   */
1403  function add_term_meta( $term_id, $meta_key, $meta_value, $unique = false ) {
1404      if ( wp_term_is_shared( $term_id ) ) {
1405          return new WP_Error( 'ambiguous_term_id', __( 'Term meta cannot be added to terms that are shared between taxonomies.' ), $term_id );
1406      }
1407  
1408      return add_metadata( 'term', $term_id, $meta_key, $meta_value, $unique );
1409  }
1410  
1411  /**
1412   * Removes metadata matching criteria from a term.
1413   *
1414   * For historical reasons both the meta key and the meta value are expected to be "slashed" (slashes escaped) on input.
1415   *
1416   * @since 4.4.0
1417   *
1418   * @param int    $term_id    Term ID.
1419   * @param string $meta_key   Metadata name.
1420   * @param mixed  $meta_value Optional. Metadata value. If provided,
1421   *                           rows will only be removed that match the value.
1422   *                           Must be serializable if non-scalar. Default empty.
1423   * @return bool True on success, false on failure.
1424   */
1425  function delete_term_meta( $term_id, $meta_key, $meta_value = '' ) {
1426      return delete_metadata( 'term', $term_id, $meta_key, $meta_value );
1427  }
1428  
1429  /**
1430   * Retrieves metadata for a term.
1431   *
1432   * @since 4.4.0
1433   *
1434   * @param int    $term_id Term ID.
1435   * @param string $key     Optional. The meta key to retrieve. By default,
1436   *                        returns data for all keys. Default empty.
1437   * @param bool   $single  Optional. Whether to return a single value.
1438   *                        This parameter has no effect if `$key` is not specified.
1439   *                        Default false.
1440   * @return mixed An array of values if `$single` is false.
1441   *               The value of the meta field if `$single` is true.
1442   *               False for an invalid `$term_id` (non-numeric, zero, or negative value).
1443   *               An empty array if a valid but non-existing term ID is passed and `$single` is false.
1444   *               An empty string if a valid but non-existing term ID is passed and `$single` is true.
1445   *               Note: Non-serialized values are returned as strings:
1446   *               - false values are returned as empty strings ('')
1447   *               - true values are returned as '1'
1448   *               - numbers are returned as strings
1449   *               Arrays and objects retain their original type.
1450   */
1451  function get_term_meta( $term_id, $key = '', $single = false ) {
1452      return get_metadata( 'term', $term_id, $key, $single );
1453  }
1454  
1455  /**
1456   * Updates term metadata.
1457   *
1458   * Use the `$prev_value` parameter to differentiate between meta fields with the same key and term ID.
1459   *
1460   * If the meta field for the term does not exist, it will be added.
1461   *
1462   * For historical reasons both the meta key and the meta value are expected to be "slashed" (slashes escaped) on input.
1463   *
1464   * @since 4.4.0
1465   *
1466   * @param int    $term_id    Term ID.
1467   * @param string $meta_key   Metadata key.
1468   * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
1469   * @param mixed  $prev_value Optional. Previous value to check before updating.
1470   *                           If specified, only update existing metadata entries with
1471   *                           this value. Otherwise, update all entries. Default empty.
1472   * @return int|bool|WP_Error Meta ID if the key didn't exist. true on successful update,
1473   *                           false on failure or if the value passed to the function
1474   *                           is the same as the one that is already in the database.
1475   *                           WP_Error when term_id is ambiguous between taxonomies.
1476   */
1477  function update_term_meta( $term_id, $meta_key, $meta_value, $prev_value = '' ) {
1478      if ( wp_term_is_shared( $term_id ) ) {
1479          return new WP_Error( 'ambiguous_term_id', __( 'Term meta cannot be added to terms that are shared between taxonomies.' ), $term_id );
1480      }
1481  
1482      return update_metadata( 'term', $term_id, $meta_key, $meta_value, $prev_value );
1483  }
1484  
1485  /**
1486   * Updates metadata cache for list of term IDs.
1487   *
1488   * Performs SQL query to retrieve all metadata for the terms matching `$term_ids` and stores them in the cache.
1489   * Subsequent calls to `get_term_meta()` will not need to query the database.
1490   *
1491   * @since 4.4.0
1492   *
1493   * @param array $term_ids List of term IDs.
1494   * @return array|false An array of metadata on success, false if there is nothing to update.
1495   */
1496  function update_termmeta_cache( $term_ids ) {
1497      return update_meta_cache( 'term', $term_ids );
1498  }
1499  
1500  
1501  /**
1502   * Queue term meta for lazy-loading.
1503   *
1504   * @since 6.3.0
1505   *
1506   * @param array $term_ids List of term IDs.
1507   */
1508  function wp_lazyload_term_meta( array $term_ids ) {
1509      if ( empty( $term_ids ) ) {
1510          return;
1511      }
1512      $lazyloader = wp_metadata_lazyloader();
1513      $lazyloader->queue_objects( 'term', $term_ids );
1514  }
1515  
1516  /**
1517   * Gets all meta data, including meta IDs, for the given term ID.
1518   *
1519   * @since 4.9.0
1520   *
1521   * @global wpdb $wpdb WordPress database abstraction object.
1522   *
1523   * @param int $term_id Term ID.
1524   * @return array|false Array with meta data, or false when the meta table is not installed.
1525   */
1526  function has_term_meta( $term_id ) {
1527      $check = wp_check_term_meta_support_prefilter( null );
1528      if ( null !== $check ) {
1529          return $check;
1530      }
1531  
1532      global $wpdb;
1533  
1534      return $wpdb->get_results( $wpdb->prepare( "SELECT meta_key, meta_value, meta_id, term_id FROM $wpdb->termmeta WHERE term_id = %d ORDER BY meta_key,meta_id", $term_id ), ARRAY_A );
1535  }
1536  
1537  /**
1538   * Registers a meta key for terms.
1539   *
1540   * @since 4.9.8
1541   *
1542   * @param string $taxonomy Taxonomy to register a meta key for. Pass an empty string
1543   *                         to register the meta key across all existing taxonomies.
1544   * @param string $meta_key The meta key to register.
1545   * @param array  $args     Data used to describe the meta key when registered. See
1546   *                         {@see register_meta()} for a list of supported arguments.
1547   * @return bool True if the meta key was successfully registered, false if not.
1548   */
1549  function register_term_meta( $taxonomy, $meta_key, array $args ) {
1550      $args['object_subtype'] = $taxonomy;
1551  
1552      return register_meta( 'term', $meta_key, $args );
1553  }
1554  
1555  /**
1556   * Unregisters a meta key for terms.
1557   *
1558   * @since 4.9.8
1559   *
1560   * @param string $taxonomy Taxonomy the meta key is currently registered for. Pass
1561   *                         an empty string if the meta key is registered across all
1562   *                         existing taxonomies.
1563   * @param string $meta_key The meta key to unregister.
1564   * @return bool True on success, false if the meta key was not previously registered.
1565   */
1566  function unregister_term_meta( $taxonomy, $meta_key ) {
1567      return unregister_meta_key( 'term', $meta_key, $taxonomy );
1568  }
1569  
1570  /**
1571   * Determines whether a taxonomy term exists.
1572   *
1573   * Formerly is_term(), introduced in 2.3.0.
1574   *
1575   * For more information on this and similar theme functions, check out
1576   * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
1577   * Conditional Tags} article in the Theme Developer Handbook.
1578   *
1579   * @since 3.0.0
1580   * @since 6.0.0 Converted to use `get_terms()`.
1581   *
1582   * @global bool $_wp_suspend_cache_invalidation
1583   *
1584   * @param int|string $term        The term to check. Accepts term ID, slug, or name.
1585   * @param string     $taxonomy    Optional. The taxonomy name to use.
1586   * @param int        $parent_term Optional. ID of parent term under which to confine the exists search.
1587   * @return mixed Returns null if the term does not exist.
1588   *               Returns the term ID if no taxonomy is specified and the term ID exists.
1589   *               Returns an array of the term ID and the term taxonomy ID if the taxonomy is specified and the pairing exists.
1590   *               Returns 0 if term ID 0 is passed to the function.
1591   */
1592  function term_exists( $term, $taxonomy = '', $parent_term = null ) {
1593      global $_wp_suspend_cache_invalidation;
1594  
1595      if ( null === $term ) {
1596          return null;
1597      }
1598  
1599      $defaults = array(
1600          'get'                    => 'all',
1601          'fields'                 => 'ids',
1602          'number'                 => 1,
1603          'update_term_meta_cache' => false,
1604          'order'                  => 'ASC',
1605          'orderby'                => 'term_id',
1606          'suppress_filter'        => true,
1607      );
1608  
1609      // Ensure that while importing, queries are not cached.
1610      if ( ! empty( $_wp_suspend_cache_invalidation ) ) {
1611          $defaults['cache_results'] = false;
1612      }
1613  
1614      if ( ! empty( $taxonomy ) ) {
1615          $defaults['taxonomy'] = $taxonomy;
1616          $defaults['fields']   = 'all';
1617      }
1618  
1619      /**
1620       * Filters default query arguments for checking if a term exists.
1621       *
1622       * @since 6.0.0
1623       *
1624       * @param array      $defaults    An array of arguments passed to get_terms().
1625       * @param int|string $term        The term to check. Accepts term ID, slug, or name.
1626       * @param string     $taxonomy    The taxonomy name to use. An empty string indicates
1627       *                                the search is against all taxonomies.
1628       * @param int|null   $parent_term ID of parent term under which to confine the exists search.
1629       *                                Null indicates the search is unconfined.
1630       */
1631      $defaults = apply_filters( 'term_exists_default_query_args', $defaults, $term, $taxonomy, $parent_term );
1632  
1633      if ( is_int( $term ) ) {
1634          if ( 0 === $term ) {
1635              return 0;
1636          }
1637          $args  = wp_parse_args( array( 'include' => array( $term ) ), $defaults );
1638          $terms = get_terms( $args );
1639      } else {
1640          $term = trim( wp_unslash( $term ) );
1641          if ( '' === $term ) {
1642              return null;
1643          }
1644  
1645          if ( ! empty( $taxonomy ) && is_numeric( $parent_term ) ) {
1646              $defaults['parent'] = (int) $parent_term;
1647          }
1648  
1649          $args  = wp_parse_args( array( 'slug' => sanitize_title( $term ) ), $defaults );
1650          $terms = get_terms( $args );
1651          if ( empty( $terms ) || is_wp_error( $terms ) ) {
1652              $args  = wp_parse_args( array( 'name' => $term ), $defaults );
1653              $terms = get_terms( $args );
1654          }
1655      }
1656  
1657      if ( empty( $terms ) || is_wp_error( $terms ) ) {
1658          return null;
1659      }
1660  
1661      $_term = array_shift( $terms );
1662  
1663      if ( ! empty( $taxonomy ) ) {
1664          return array(
1665              'term_id'          => (string) $_term->term_id,
1666              'term_taxonomy_id' => (string) $_term->term_taxonomy_id,
1667          );
1668      }
1669  
1670      return (string) $_term;
1671  }
1672  
1673  /**
1674   * Checks if a term is an ancestor of another term.
1675   *
1676   * You can use either an ID or the term object for both parameters.
1677   *
1678   * @since 3.4.0
1679   *
1680   * @param int|object $term1    ID or object to check if this is the parent term.
1681   * @param int|object $term2    The child term.
1682   * @param string     $taxonomy Taxonomy name that $term1 and `$term2` belong to.
1683   * @return bool Whether `$term2` is a child of `$term1`.
1684   */
1685  function term_is_ancestor_of( $term1, $term2, $taxonomy ) {
1686      if ( ! isset( $term1->term_id ) ) {
1687          $term1 = get_term( $term1, $taxonomy );
1688      }
1689      if ( ! isset( $term2->parent ) ) {
1690          $term2 = get_term( $term2, $taxonomy );
1691      }
1692  
1693      if ( empty( $term1->term_id ) || empty( $term2->parent ) ) {
1694          return false;
1695      }
1696      if ( $term2->parent === $term1->term_id ) {
1697          return true;
1698      }
1699  
1700      return term_is_ancestor_of( $term1, get_term( $term2->parent, $taxonomy ), $taxonomy );
1701  }
1702  
1703  /**
1704   * Sanitizes all term fields.
1705   *
1706   * Relies on sanitize_term_field() to sanitize the term. The difference is that
1707   * this function will sanitize **all** fields. The context is based
1708   * on sanitize_term_field().
1709   *
1710   * The `$term` is expected to be either an array or an object.
1711   *
1712   * @since 2.3.0
1713   *
1714   * @param array|object $term     The term to check.
1715   * @param string       $taxonomy The taxonomy name to use.
1716   * @param string       $context  Optional. Context in which to sanitize the term.
1717   *                               Accepts 'raw', 'edit', 'db', 'display', 'rss',
1718   *                               'attribute', or 'js'. Default 'display'.
1719   * @return array|object Term with all fields sanitized.
1720   */
1721  function sanitize_term( $term, $taxonomy, $context = 'display' ) {
1722      $fields = array( 'term_id', 'name', 'description', 'slug', 'count', 'parent', 'term_group', 'term_taxonomy_id', 'object_id' );
1723  
1724      $do_object = is_object( $term );
1725  
1726      $term_id = $do_object ? $term->term_id : ( isset( $term['term_id'] ) ? $term['term_id'] : 0 );
1727  
1728      foreach ( (array) $fields as $field ) {
1729          if ( $do_object ) {
1730              if ( isset( $term->$field ) ) {
1731                  $term->$field = sanitize_term_field( $field, $term->$field, $term_id, $taxonomy, $context );
1732              }
1733          } else {
1734              if ( isset( $term[ $field ] ) ) {
1735                  $term[ $field ] = sanitize_term_field( $field, $term[ $field ], $term_id, $taxonomy, $context );
1736              }
1737          }
1738      }
1739  
1740      if ( $do_object ) {
1741          $term->filter = $context;
1742      } else {
1743          $term['filter'] = $context;
1744      }
1745  
1746      return $term;
1747  }
1748  
1749  /**
1750   * Sanitizes the field value in the term based on the context.
1751   *
1752   * Passing a term field value through the function should be assumed to have
1753   * cleansed the value for whatever context the term field is going to be used.
1754   *
1755   * If no context or an unsupported context is given, then default filters will
1756   * be applied.
1757   *
1758   * There are enough filters for each context to support a custom filtering
1759   * without creating your own filter function. Simply create a function that
1760   * hooks into the filter you need.
1761   *
1762   * @since 2.3.0
1763   *
1764   * @param string $field    Term field to sanitize.
1765   * @param string $value    Search for this term value.
1766   * @param int    $term_id  Term ID.
1767   * @param string $taxonomy Taxonomy name.
1768   * @param string $context  Context in which to sanitize the term field.
1769   *                         Accepts 'raw', 'edit', 'db', 'display', 'rss',
1770   *                         'attribute', or 'js'. Default 'display'.
1771   * @return mixed Sanitized field.
1772   */
1773  function sanitize_term_field( $field, $value, $term_id, $taxonomy, $context ) {
1774      $int_fields = array( 'parent', 'term_id', 'count', 'term_group', 'term_taxonomy_id', 'object_id' );
1775      if ( in_array( $field, $int_fields, true ) ) {
1776          $value = (int) $value;
1777          if ( $value < 0 ) {
1778              $value = 0;
1779          }
1780      }
1781  
1782      $context = strtolower( $context );
1783  
1784      if ( 'raw' === $context ) {
1785          return $value;
1786      }
1787  
1788      if ( 'edit' === $context ) {
1789  
1790          /**
1791           * Filters a term field to edit before it is sanitized.
1792           *
1793           * The dynamic portion of the hook name, `$field`, refers to the term field.
1794           *
1795           * @since 2.3.0
1796           *
1797           * @param mixed $value     Value of the term field.
1798           * @param int   $term_id   Term ID.
1799           * @param string $taxonomy Taxonomy slug.
1800           */
1801          $value = apply_filters( "edit_term_{$field}", $value, $term_id, $taxonomy );
1802  
1803          /**
1804           * Filters the taxonomy field to edit before it is sanitized.
1805           *
1806           * The dynamic portions of the filter name, `$taxonomy` and `$field`, refer
1807           * to the taxonomy slug and taxonomy field, respectively.
1808           *
1809           * @since 2.3.0
1810           *
1811           * @param mixed $value   Value of the taxonomy field to edit.
1812           * @param int   $term_id Term ID.
1813           */
1814          $value = apply_filters( "edit_{$taxonomy}_{$field}", $value, $term_id );
1815  
1816          if ( 'description' === $field ) {
1817              $value = esc_html( $value ); // textarea_escaped
1818          } else {
1819              $value = esc_attr( $value );
1820          }
1821      } elseif ( 'db' === $context ) {
1822  
1823          /**
1824           * Filters a term field value before it is sanitized.
1825           *
1826           * The dynamic portion of the hook name, `$field`, refers to the term field.
1827           *
1828           * @since 2.3.0
1829           *
1830           * @param mixed  $value    Value of the term field.
1831           * @param string $taxonomy Taxonomy slug.
1832           */
1833          $value = apply_filters( "pre_term_{$field}", $value, $taxonomy );
1834  
1835          /**
1836           * Filters a taxonomy field before it is sanitized.
1837           *
1838           * The dynamic portions of the filter name, `$taxonomy` and `$field`, refer
1839           * to the taxonomy slug and field name, respectively.
1840           *
1841           * @since 2.3.0
1842           *
1843           * @param mixed $value Value of the taxonomy field.
1844           */
1845          $value = apply_filters( "pre_{$taxonomy}_{$field}", $value );
1846  
1847          // Back compat filters.
1848          if ( 'slug' === $field ) {
1849              /**
1850               * Filters the category nicename before it is sanitized.
1851               *
1852               * Use the {@see 'pre_$taxonomy_$field'} hook instead.
1853               *
1854               * @since 2.0.3
1855               *
1856               * @param string $value The category nicename.
1857               */
1858              $value = apply_filters( 'pre_category_nicename', $value );
1859          }
1860      } elseif ( 'rss' === $context ) {
1861  
1862          /**
1863           * Filters the term field for use in RSS.
1864           *
1865           * The dynamic portion of the hook name, `$field`, refers to the term field.
1866           *
1867           * @since 2.3.0
1868           *
1869           * @param mixed  $value    Value of the term field.
1870           * @param string $taxonomy Taxonomy slug.
1871           */
1872          $value = apply_filters( "term_{$field}_rss", $value, $taxonomy );
1873  
1874          /**
1875           * Filters the taxonomy field for use in RSS.
1876           *
1877           * The dynamic portions of the hook name, `$taxonomy`, and `$field`, refer
1878           * to the taxonomy slug and field name, respectively.
1879           *
1880           * @since 2.3.0
1881           *
1882           * @param mixed $value Value of the taxonomy field.
1883           */
1884          $value = apply_filters( "{$taxonomy}_{$field}_rss", $value );
1885      } else {
1886          // Use display filters by default.
1887  
1888          /**
1889           * Filters the term field sanitized for display.
1890           *
1891           * The dynamic portion of the hook name, `$field`, refers to the term field name.
1892           *
1893           * @since 2.3.0
1894           *
1895           * @param mixed  $value    Value of the term field.
1896           * @param int    $term_id  Term ID.
1897           * @param string $taxonomy Taxonomy slug.
1898           * @param string $context  Context to retrieve the term field value.
1899           */
1900          $value = apply_filters( "term_{$field}", $value, $term_id, $taxonomy, $context );
1901  
1902          /**
1903           * Filters the taxonomy field sanitized for display.
1904           *
1905           * The dynamic portions of the filter name, `$taxonomy`, and `$field`, refer
1906           * to the taxonomy slug and taxonomy field, respectively.
1907           *
1908           * @since 2.3.0
1909           *
1910           * @param mixed  $value   Value of the taxonomy field.
1911           * @param int    $term_id Term ID.
1912           * @param string $context Context to retrieve the taxonomy field value.
1913           */
1914          $value = apply_filters( "{$taxonomy}_{$field}", $value, $term_id, $context );
1915      }
1916  
1917      if ( 'attribute' === $context ) {
1918          $value = esc_attr( $value );
1919      } elseif ( 'js' === $context ) {
1920          $value = esc_js( $value );
1921      }
1922  
1923      // Restore the type for integer fields after esc_attr().
1924      if ( in_array( $field, $int_fields, true ) ) {
1925          $value = (int) $value;
1926      }
1927  
1928      return $value;
1929  }
1930  
1931  /**
1932   * Counts how many terms are in taxonomy.
1933   *
1934   * Default $args is 'hide_empty' which can be 'hide_empty=true' or array('hide_empty' => true).
1935   *
1936   * {@internal The `$deprecated` parameter is parsed for backward compatibility only.}
1937   *
1938   * @since 2.3.0
1939   * @since 5.6.0 Changed the function signature so that the `$args` array can be provided as the first parameter.
1940   *
1941   * @param array|string $args       Optional. Array or string of arguments. See WP_Term_Query::__construct()
1942   *                                 for information on accepted arguments. Default empty array.
1943   * @param array|string $deprecated Optional. Argument array, when using the legacy function parameter format.
1944   *                                 If present, this parameter will be interpreted as `$args`, and the first
1945   *                                 function parameter will be parsed as a taxonomy or array of taxonomies.
1946   *                                 Default empty.
1947   * @return string|WP_Error Numeric string containing the number of terms in that
1948   *                         taxonomy or WP_Error if the taxonomy does not exist.
1949   */
1950  function wp_count_terms( $args = array(), $deprecated = '' ) {
1951      $use_legacy_args = false;
1952  
1953      // Check whether function is used with legacy signature: `$taxonomy` and `$args`.
1954      if ( $args
1955          && ( is_string( $args ) && taxonomy_exists( $args )
1956              || is_array( $args ) && wp_is_numeric_array( $args ) )
1957      ) {
1958          $use_legacy_args = true;
1959      }
1960  
1961      $defaults = array( 'hide_empty' => false );
1962  
1963      if ( $use_legacy_args ) {
1964          $defaults['taxonomy'] = $args;
1965          $args                 = $deprecated;
1966      }
1967  
1968      $args = wp_parse_args( $args, $defaults );
1969  
1970      // Backward compatibility.
1971      if ( isset( $args['ignore_empty'] ) ) {
1972          $args['hide_empty'] = $args['ignore_empty'];
1973          unset( $args['ignore_empty'] );
1974      }
1975  
1976      $args['fields'] = 'count';
1977  
1978      return get_terms( $args );
1979  }
1980  
1981  /**
1982   * Unlinks the object from the taxonomy or taxonomies.
1983   *
1984   * Will remove all relationships between the object and any terms in
1985   * a particular taxonomy or taxonomies. Does not remove the term or
1986   * taxonomy itself.
1987   *
1988   * @since 2.3.0
1989   *
1990   * @param int          $object_id  The term object ID that refers to the term.
1991   * @param string|array $taxonomies List of taxonomy names or single taxonomy name.
1992   */
1993  function wp_delete_object_term_relationships( $object_id, $taxonomies ) {
1994      $object_id = (int) $object_id;
1995  
1996      if ( ! is_array( $taxonomies ) ) {
1997          $taxonomies = array( $taxonomies );
1998      }
1999  
2000      foreach ( (array) $taxonomies as $taxonomy ) {
2001          $term_ids = wp_get_object_terms( $object_id, $taxonomy, array( 'fields' => 'ids' ) );
2002          $term_ids = array_map( 'intval', $term_ids );
2003          wp_remove_object_terms( $object_id, $term_ids, $taxonomy );
2004      }
2005  }
2006  
2007  /**
2008   * Removes a term from the database.
2009   *
2010   * If the term is a parent of other terms, then the children will be updated to
2011   * that term's parent.
2012   *
2013   * Metadata associated with the term will be deleted.
2014   *
2015   * @since 2.3.0
2016   *
2017   * @global wpdb $wpdb WordPress database abstraction object.
2018   *
2019   * @param int          $term     Term ID.
2020   * @param string       $taxonomy Taxonomy name.
2021   * @param array|string $args {
2022   *     Optional. Array of arguments to override the default term ID. Default empty array.
2023   *
2024   *     @type int  $default       The term ID to make the default term. This will only override
2025   *                               the terms found if there is only one term found. Any other and
2026   *                               the found terms are used.
2027   *     @type bool $force_default Optional. Whether to force the supplied term as default to be
2028   *                               assigned even if the object was not going to be term-less.
2029   *                               Default false.
2030   * }
2031   * @return bool|int|WP_Error True on success, false if term does not exist. Zero on attempted
2032   *                           deletion of default Category. WP_Error if the taxonomy does not exist.
2033   */
2034  function wp_delete_term( $term, $taxonomy, $args = array() ) {
2035      global $wpdb;
2036  
2037      $term = (int) $term;
2038  
2039      $ids = term_exists( $term, $taxonomy );
2040      if ( ! $ids ) {
2041          return false;
2042      }
2043      if ( is_wp_error( $ids ) ) {
2044          return $ids;
2045      }
2046  
2047      $tt_id = $ids['term_taxonomy_id'];
2048  
2049      $defaults = array();
2050  
2051      if ( 'category' === $taxonomy ) {
2052          $defaults['default'] = (int) get_option( 'default_category' );
2053          if ( $defaults['default'] === $term ) {
2054              return 0; // Don't delete the default category.
2055          }
2056      }
2057  
2058      // Don't delete the default custom taxonomy term.
2059      $taxonomy_object = get_taxonomy( $taxonomy );
2060      if ( ! empty( $taxonomy_object->default_term ) ) {
2061          $defaults['default'] = (int) get_option( 'default_term_' . $taxonomy );
2062          if ( $defaults['default'] === $term ) {
2063              return 0;
2064          }
2065      }
2066  
2067      $args = wp_parse_args( $args, $defaults );
2068  
2069      if ( isset( $args['default'] ) ) {
2070          $default = (int) $args['default'];
2071          if ( ! term_exists( $default, $taxonomy ) ) {
2072              unset( $default );
2073          }
2074      }
2075  
2076      if ( isset( $args['force_default'] ) ) {
2077          $force_default = $args['force_default'];
2078      }
2079  
2080      /**
2081       * Fires when deleting a term, before any modifications are made to posts or terms.
2082       *
2083       * @since 4.1.0
2084       *
2085       * @param int    $term     Term ID.
2086       * @param string $taxonomy Taxonomy name.
2087       */
2088      do_action( 'pre_delete_term', $term, $taxonomy );
2089  
2090      // Update children to point to new parent.
2091      if ( is_taxonomy_hierarchical( $taxonomy ) ) {
2092          $term_obj = get_term( $term, $taxonomy );
2093          if ( is_wp_error( $term_obj ) ) {
2094              return $term_obj;
2095          }
2096          $parent = $term_obj->parent;
2097  
2098          $edit_ids    = $wpdb->get_results( "SELECT term_id, term_taxonomy_id FROM $wpdb->term_taxonomy WHERE `parent` = " . (int) $term_obj->term_id );
2099          $edit_tt_ids = wp_list_pluck( $edit_ids, 'term_taxonomy_id' );
2100  
2101          /**
2102           * Fires immediately before a term to delete's children are reassigned a parent.
2103           *
2104           * @since 2.9.0
2105           *
2106           * @param array $edit_tt_ids An array of term taxonomy IDs for the given term.
2107           */
2108          do_action( 'edit_term_taxonomies', $edit_tt_ids );
2109  
2110          $wpdb->update( $wpdb->term_taxonomy, compact( 'parent' ), array( 'parent' => $term_obj->term_id ) + compact( 'taxonomy' ) );
2111  
2112          // Clean the cache for all child terms.
2113          $edit_term_ids = wp_list_pluck( $edit_ids, 'term_id' );
2114          clean_term_cache( $edit_term_ids, $taxonomy );
2115  
2116          /**
2117           * Fires immediately after a term to delete's children are reassigned a parent.
2118           *
2119           * @since 2.9.0
2120           *
2121           * @param array $edit_tt_ids An array of term taxonomy IDs for the given term.
2122           */
2123          do_action( 'edited_term_taxonomies', $edit_tt_ids );
2124      }
2125  
2126      // Get the term before deleting it or its term relationships so we can pass to actions below.
2127      $deleted_term = get_term( $term, $taxonomy );
2128  
2129      $object_ids = (array) $wpdb->get_col( $wpdb->prepare( "SELECT object_id FROM $wpdb->term_relationships WHERE term_taxonomy_id = %d", $tt_id ) );
2130  
2131      foreach ( $object_ids as $object_id ) {
2132          if ( ! isset( $default ) ) {
2133              wp_remove_object_terms( $object_id, $term, $taxonomy );
2134              continue;
2135          }
2136  
2137          $terms = wp_get_object_terms(
2138              $object_id,
2139              $taxonomy,
2140              array(
2141                  'fields'  => 'ids',
2142                  'orderby' => 'none',
2143              )
2144          );
2145  
2146          if ( 1 === count( $terms ) && isset( $default ) ) {
2147              $terms = array( $default );
2148          } else {
2149              $terms = array_diff( $terms, array( $term ) );
2150              if ( isset( $default ) && isset( $force_default ) && $force_default ) {
2151                  $terms = array_merge( $terms, array( $default ) );
2152              }
2153          }
2154  
2155          $terms = array_map( 'intval', $terms );
2156          wp_set_object_terms( $object_id, $terms, $taxonomy );
2157      }
2158  
2159      // Clean the relationship caches for all object types using this term.
2160      $tax_object = get_taxonomy( $taxonomy );
2161      foreach ( $tax_object->object_type as $object_type ) {
2162          clean_object_term_cache( $object_ids, $object_type );
2163      }
2164  
2165      $term_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->termmeta WHERE term_id = %d ", $term ) );
2166      foreach ( $term_meta_ids as $mid ) {
2167          delete_metadata_by_mid( 'term', $mid );
2168      }
2169  
2170      /**
2171       * Fires immediately before a term taxonomy ID is deleted.
2172       *
2173       * @since 2.9.0
2174       *
2175       * @param int $tt_id Term taxonomy ID.
2176       */
2177      do_action( 'delete_term_taxonomy', $tt_id );
2178  
2179      $wpdb->delete( $wpdb->term_taxonomy, array( 'term_taxonomy_id' => $tt_id ) );
2180  
2181      /**
2182       * Fires immediately after a term taxonomy ID is deleted.
2183       *
2184       * @since 2.9.0
2185       *
2186       * @param int $tt_id Term taxonomy ID.
2187       */
2188      do_action( 'deleted_term_taxonomy', $tt_id );
2189  
2190      // Delete the term if no taxonomies use it.
2191      if ( ! $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_taxonomy WHERE term_id = %d", $term ) ) ) {
2192          $wpdb->delete( $wpdb->terms, array( 'term_id' => $term ) );
2193      }
2194  
2195      clean_term_cache( $term, $taxonomy );
2196  
2197      /**
2198       * Fires after a term is deleted from the database and the cache is cleaned.
2199       *
2200       * The {@see 'delete_$taxonomy'} hook is also available for targeting a specific
2201       * taxonomy.
2202       *
2203       * @since 2.5.0
2204       * @since 4.5.0 Introduced the `$object_ids` argument.
2205       *
2206       * @param int     $term         Term ID.
2207       * @param int     $tt_id        Term taxonomy ID.
2208       * @param string  $taxonomy     Taxonomy slug.
2209       * @param WP_Term $deleted_term Copy of the already-deleted term.
2210       * @param array   $object_ids   List of term object IDs.
2211       */
2212      do_action( 'delete_term', $term, $tt_id, $taxonomy, $deleted_term, $object_ids );
2213  
2214      /**
2215       * Fires after a term in a specific taxonomy is deleted.
2216       *
2217       * The dynamic portion of the hook name, `$taxonomy`, refers to the specific
2218       * taxonomy the term belonged to.
2219       *
2220       * Possible hook names include:
2221       *
2222       *  - `delete_category`
2223       *  - `delete_post_tag`
2224       *
2225       * @since 2.3.0
2226       * @since 4.5.0 Introduced the `$object_ids` argument.
2227       *
2228       * @param int     $term         Term ID.
2229       * @param int     $tt_id        Term taxonomy ID.
2230       * @param WP_Term $deleted_term Copy of the already-deleted term.
2231       * @param array   $object_ids   List of term object IDs.
2232       */
2233      do_action( "delete_{$taxonomy}", $term, $tt_id, $deleted_term, $object_ids );
2234  
2235      return true;
2236  }
2237  
2238  /**
2239   * Deletes one existing category.
2240   *
2241   * @since 2.0.0
2242   *
2243   * @param int $cat_id Category term ID.
2244   * @return bool|int|WP_Error Returns true if completes delete action; false if term doesn't exist;
2245   *                           Zero on attempted deletion of default Category; WP_Error object is
2246   *                           also a possibility.
2247   */
2248  function wp_delete_category( $cat_id ) {
2249      return wp_delete_term( $cat_id, 'category' );
2250  }
2251  
2252  /**
2253   * Retrieves the terms associated with the given object(s), in the supplied taxonomies.
2254   *
2255   * @since 2.3.0
2256   * @since 4.2.0 Added support for 'taxonomy', 'parent', and 'term_taxonomy_id' values of `$orderby`.
2257   *              Introduced `$parent` argument.
2258   * @since 4.4.0 Introduced `$meta_query` and `$update_term_meta_cache` arguments. When `$fields` is 'all' or
2259   *              'all_with_object_id', an array of `WP_Term` objects will be returned.
2260   * @since 4.7.0 Refactored to use WP_Term_Query, and to support any WP_Term_Query arguments.
2261   * @since 6.3.0 Passing `update_term_meta_cache` argument value false by default resulting in get_terms() to not
2262   *              prime the term meta cache.
2263   *
2264   * @param int|int[]       $object_ids The ID(s) of the object(s) to retrieve.
2265   * @param string|string[] $taxonomies The taxonomy names to retrieve terms from.
2266   * @param array|string    $args       See WP_Term_Query::__construct() for supported arguments.
2267   * @return WP_Term[]|int[]|string[]|string|WP_Error Array of terms, a count thereof as a numeric string,
2268   *                                                  or WP_Error if any of the taxonomies do not exist.
2269   *                                                  See WP_Term_Query::get_terms() for more information.
2270   */
2271  function wp_get_object_terms( $object_ids, $taxonomies, $args = array() ) {
2272      if ( empty( $object_ids ) || empty( $taxonomies ) ) {
2273          return array();
2274      }
2275  
2276      if ( ! is_array( $taxonomies ) ) {
2277          $taxonomies = array( $taxonomies );
2278      }
2279  
2280      foreach ( $taxonomies as $taxonomy ) {
2281          if ( ! taxonomy_exists( $taxonomy ) ) {
2282              return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
2283          }
2284      }
2285  
2286      if ( ! is_array( $object_ids ) ) {
2287          $object_ids = array( $object_ids );
2288      }
2289      $object_ids = array_map( 'intval', $object_ids );
2290  
2291      $defaults = array(
2292          'update_term_meta_cache' => false,
2293      );
2294  
2295      $args = wp_parse_args( $args, $defaults );
2296  
2297      /**
2298       * Filters arguments for retrieving object terms.
2299       *
2300       * @since 4.9.0
2301       *
2302       * @param array    $args       An array of arguments for retrieving terms for the given object(s).
2303       *                             See {@see wp_get_object_terms()} for details.
2304       * @param int[]    $object_ids Array of object IDs.
2305       * @param string[] $taxonomies Array of taxonomy names to retrieve terms from.
2306       */
2307      $args = apply_filters( 'wp_get_object_terms_args', $args, $object_ids, $taxonomies );
2308  
2309      /*
2310       * When one or more queried taxonomies is registered with an 'args' array,
2311       * those params override the `$args` passed to this function.
2312       */
2313      $terms = array();
2314      if ( count( $taxonomies ) > 1 ) {
2315          foreach ( $taxonomies as $index => $taxonomy ) {
2316              $t = get_taxonomy( $taxonomy );
2317              if ( isset( $t->args ) && is_array( $t->args ) && array_merge( $args, $t->args ) != $args ) {
2318                  unset( $taxonomies[ $index ] );
2319                  $terms = array_merge( $terms, wp_get_object_terms( $object_ids, $taxonomy, array_merge( $args, $t->args ) ) );
2320              }
2321          }
2322      } else {
2323          $t = get_taxonomy( $taxonomies[0] );
2324          if ( isset( $t->args ) && is_array( $t->args ) ) {
2325              $args = array_merge( $args, $t->args );
2326          }
2327      }
2328  
2329      $args['taxonomy']   = $taxonomies;
2330      $args['object_ids'] = $object_ids;
2331  
2332      // Taxonomies registered without an 'args' param are handled here.
2333      if ( ! empty( $taxonomies ) ) {
2334          $terms_from_remaining_taxonomies = get_terms( $args );
2335  
2336          // Array keys should be preserved for values of $fields that use term_id for keys.
2337          if ( ! empty( $args['fields'] ) && str_starts_with( $args['fields'], 'id=>' ) ) {
2338              $terms = $terms + $terms_from_remaining_taxonomies;
2339          } else {
2340              $terms = array_merge( $terms, $terms_from_remaining_taxonomies );
2341          }
2342      }
2343  
2344      /**
2345       * Filters the terms for a given object or objects.
2346       *
2347       * @since 4.2.0
2348       *
2349       * @param WP_Term[]|int[]|string[]|string $terms      Array of terms or a count thereof as a numeric string.
2350       * @param int[]                           $object_ids Array of object IDs for which terms were retrieved.
2351       * @param string[]                        $taxonomies Array of taxonomy names from which terms were retrieved.
2352       * @param array                           $args       Array of arguments for retrieving terms for the given
2353       *                                                    object(s). See wp_get_object_terms() for details.
2354       */
2355      $terms = apply_filters( 'get_object_terms', $terms, $object_ids, $taxonomies, $args );
2356  
2357      $object_ids = implode( ',', $object_ids );
2358      $taxonomies = "'" . implode( "', '", array_map( 'esc_sql', $taxonomies ) ) . "'";
2359  
2360      /**
2361       * Filters the terms for a given object or objects.
2362       *
2363       * The `$taxonomies` parameter passed to this filter is formatted as a SQL fragment. The
2364       * {@see 'get_object_terms'} filter is recommended as an alternative.
2365       *
2366       * @since 2.8.0
2367       *
2368       * @param WP_Term[]|int[]|string[]|string $terms      Array of terms or a count thereof as a numeric string.
2369       * @param string                          $object_ids Comma separated list of object IDs for which terms were retrieved.
2370       * @param string                          $taxonomies SQL fragment of taxonomy names from which terms were retrieved.
2371       * @param array                           $args       Array of arguments for retrieving terms for the given
2372       *                                                    object(s). See wp_get_object_terms() for details.
2373       */
2374      return apply_filters( 'wp_get_object_terms', $terms, $object_ids, $taxonomies, $args );
2375  }
2376  
2377  /**
2378   * Adds a new term to the database.
2379   *
2380   * A non-existent term is inserted in the following sequence:
2381   * 1. The term is added to the term table, then related to the taxonomy.
2382   * 2. If everything is correct, several actions are fired.
2383   * 3. The 'term_id_filter' is evaluated.
2384   * 4. The term cache is cleaned.
2385   * 5. Several more actions are fired.
2386   * 6. An array is returned containing the `term_id` and `term_taxonomy_id`.
2387   *
2388   * If the 'slug' argument is not empty, then it is checked to see if the term
2389   * is invalid. If it is not a valid, existing term, it is added and the term_id
2390   * is given.
2391   *
2392   * If the taxonomy is hierarchical, and the 'parent' argument is not empty,
2393   * the term is inserted and the term_id will be given.
2394   *
2395   * Error handling:
2396   * If `$taxonomy` does not exist or `$term` is empty,
2397   * a WP_Error object will be returned.
2398   *
2399   * If the term already exists on the same hierarchical level,
2400   * or the term slug and name are not unique, a WP_Error object will be returned.
2401   *
2402   * @global wpdb $wpdb WordPress database abstraction object.
2403   *
2404   * @since 2.3.0
2405   *
2406   * @param string       $term     The term name to add.
2407   * @param string       $taxonomy The taxonomy to which to add the term.
2408   * @param array|string $args {
2409   *     Optional. Array or query string of arguments for inserting a term.
2410   *
2411   *     @type string $alias_of    Slug of the term to make this term an alias of.
2412   *                               Default empty string. Accepts a term slug.
2413   *     @type string $description The term description. Default empty string.
2414   *     @type int    $parent      The id of the parent term. Default 0.
2415   *     @type string $slug        The term slug to use. Default empty string.
2416   * }
2417   * @return array|WP_Error {
2418   *     An array of the new term data, WP_Error otherwise.
2419   *
2420   *     @type int        $term_id          The new term ID.
2421   *     @type int|string $term_taxonomy_id The new term taxonomy ID. Can be a numeric string.
2422   * }
2423   */
2424  function wp_insert_term( $term, $taxonomy, $args = array() ) {
2425      global $wpdb;
2426  
2427      if ( ! taxonomy_exists( $taxonomy ) ) {
2428          return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
2429      }
2430  
2431      /**
2432       * Filters a term before it is sanitized and inserted into the database.
2433       *
2434       * @since 3.0.0
2435       * @since 6.1.0 The `$args` parameter was added.
2436       *
2437       * @param string|WP_Error $term     The term name to add, or a WP_Error object if there's an error.
2438       * @param string          $taxonomy Taxonomy slug.
2439       * @param array|string    $args     Array or query string of arguments passed to wp_insert_term().
2440       */
2441      $term = apply_filters( 'pre_insert_term', $term, $taxonomy, $args );
2442  
2443      if ( is_wp_error( $term ) ) {
2444          return $term;
2445      }
2446  
2447      if ( is_int( $term ) && 0 === $term ) {
2448          return new WP_Error( 'invalid_term_id', __( 'Invalid term ID.' ) );
2449      }
2450  
2451      if ( '' === trim( $term ) ) {
2452          return new WP_Error( 'empty_term_name', __( 'A name is required for this term.' ) );
2453      }
2454  
2455      $defaults = array(
2456          'alias_of'    => '',
2457          'description' => '',
2458          'parent'      => 0,
2459          'slug'        => '',
2460      );
2461      $args     = wp_parse_args( $args, $defaults );
2462  
2463      if ( (int) $args['parent'] > 0 && ! term_exists( (int) $args['parent'] ) ) {
2464          return new WP_Error( 'missing_parent', __( 'Parent term does not exist.' ) );
2465      }
2466  
2467      $args['name']     = $term;
2468      $args['taxonomy'] = $taxonomy;
2469  
2470      // Coerce null description to strings, to avoid database errors.
2471      $args['description'] = (string) $args['description'];
2472  
2473      $args = sanitize_term( $args, $taxonomy, 'db' );
2474  
2475      // expected_slashed ($name)
2476      $name        = wp_unslash( $args['name'] );
2477      $description = wp_unslash( $args['description'] );
2478      $parent      = (int) $args['parent'];
2479  
2480      // Sanitization could clean the name to an empty string that must be checked again.
2481      if ( '' === $name ) {
2482          return new WP_Error( 'invalid_term_name', __( 'Invalid term name.' ) );
2483      }
2484  
2485      $slug_provided = ! empty( $args['slug'] );
2486      if ( ! $slug_provided ) {
2487          $slug = sanitize_title( $name );
2488      } else {
2489          $slug = $args['slug'];
2490      }
2491  
2492      $term_group = 0;
2493      if ( $args['alias_of'] ) {
2494          $alias = get_term_by( 'slug', $args['alias_of'], $taxonomy );
2495          if ( ! empty( $alias->term_group ) ) {
2496              // The alias we want is already in a group, so let's use that one.
2497              $term_group = $alias->term_group;
2498          } elseif ( ! empty( $alias->term_id ) ) {
2499              /*
2500               * The alias is not in a group, so we create a new one
2501               * and add the alias to it.
2502               */
2503              $term_group = $wpdb->get_var( "SELECT MAX(term_group) FROM $wpdb->terms" ) + 1;
2504  
2505              wp_update_term(
2506                  $alias->term_id,
2507                  $taxonomy,
2508                  array(
2509                      'term_group' => $term_group,
2510                  )
2511              );
2512          }
2513      }
2514  
2515      /*
2516       * Prevent the creation of terms with duplicate names at the same level of a taxonomy hierarchy,
2517       * unless a unique slug has been explicitly provided.
2518       */
2519      $name_matches = get_terms(
2520          array(
2521              'taxonomy'               => $taxonomy,
2522              'name'                   => $name,
2523              'hide_empty'             => false,
2524              'parent'                 => $args['parent'],
2525              'update_term_meta_cache' => false,
2526          )
2527      );
2528  
2529      /*
2530       * The `name` match in `get_terms()` doesn't differentiate accented characters,
2531       * so we do a stricter comparison here.
2532       */
2533      $name_match = null;
2534      if ( $name_matches ) {
2535          foreach ( $name_matches as $_match ) {
2536              if ( strtolower( $name ) === strtolower( $_match->name ) ) {
2537                  $name_match = $_match;
2538                  break;
2539              }
2540          }
2541      }
2542  
2543      if ( $name_match ) {
2544          $slug_match = get_term_by( 'slug', $slug, $taxonomy );
2545          if ( ! $slug_provided || $name_match->slug === $slug || $slug_match ) {
2546              if ( is_taxonomy_hierarchical( $taxonomy ) ) {
2547                  $siblings = get_terms(
2548                      array(
2549                          'taxonomy'               => $taxonomy,
2550                          'get'                    => 'all',
2551                          'parent'                 => $parent,
2552                          'update_term_meta_cache' => false,
2553                      )
2554                  );
2555  
2556                  $existing_term = null;
2557                  $sibling_names = wp_list_pluck( $siblings, 'name' );
2558                  $sibling_slugs = wp_list_pluck( $siblings, 'slug' );
2559  
2560                  if ( ( ! $slug_provided || $name_match->slug === $slug ) && in_array( $name, $sibling_names, true ) ) {
2561                      $existing_term = $name_match;
2562                  } elseif ( $slug_match && in_array( $slug, $sibling_slugs, true ) ) {
2563                      $existing_term = $slug_match;
2564                  }
2565  
2566                  if ( $existing_term ) {
2567                      return new WP_Error( 'term_exists', __( 'A term with the name provided already exists with this parent.' ), $existing_term->term_id );
2568                  }
2569              } else {
2570                  return new WP_Error( 'term_exists', __( 'A term with the name provided already exists in this taxonomy.' ), $name_match->term_id );
2571              }
2572          }
2573      }
2574  
2575      $slug = wp_unique_term_slug( $slug, (object) $args );
2576  
2577      $data = compact( 'name', 'slug', 'term_group' );
2578  
2579      /**
2580       * Filters term data before it is inserted into the database.
2581       *
2582       * @since 4.7.0
2583       *
2584       * @param array  $data     Term data to be inserted.
2585       * @param string $taxonomy Taxonomy slug.
2586       * @param array  $args     Arguments passed to wp_insert_term().
2587       */
2588      $data = apply_filters( 'wp_insert_term_data', $data, $taxonomy, $args );
2589  
2590      if ( false === $wpdb->insert( $wpdb->terms, $data ) ) {
2591          return new WP_Error( 'db_insert_error', __( 'Could not insert term into the database.' ), $wpdb->last_error );
2592      }
2593  
2594      $term_id = (int) $wpdb->insert_id;
2595  
2596      // Seems unreachable. However, is used in the case that a term name is provided, which sanitizes to an empty string.
2597      if ( empty( $slug ) ) {
2598          $slug = sanitize_title( $slug, $term_id );
2599  
2600          /** This action is documented in wp-includes/taxonomy.php */
2601          do_action( 'edit_terms', $term_id, $taxonomy );
2602          $wpdb->update( $wpdb->terms, compact( 'slug' ), compact( 'term_id' ) );
2603  
2604          /** This action is documented in wp-includes/taxonomy.php */
2605          do_action( 'edited_terms', $term_id, $taxonomy );
2606      }
2607  
2608      $tt_id = $wpdb->get_var( $wpdb->prepare( "SELECT tt.term_taxonomy_id FROM $wpdb->term_taxonomy AS tt INNER JOIN $wpdb->terms AS t ON tt.term_id = t.term_id WHERE tt.taxonomy = %s AND t.term_id = %d", $taxonomy, $term_id ) );
2609  
2610      if ( ! empty( $tt_id ) ) {
2611          return array(
2612              'term_id'          => $term_id,
2613              'term_taxonomy_id' => $tt_id,
2614          );
2615      }
2616  
2617      if ( false === $wpdb->insert( $wpdb->term_taxonomy, compact( 'term_id', 'taxonomy', 'description', 'parent' ) + array( 'count' => 0 ) ) ) {
2618          return new WP_Error( 'db_insert_error', __( 'Could not insert term taxonomy into the database.' ), $wpdb->last_error );
2619      }
2620  
2621      $tt_id = (int) $wpdb->insert_id;
2622  
2623      /*
2624       * Confidence check: if we just created a term with the same parent + taxonomy + slug but a higher term_id than
2625       * an existing term, then we have unwittingly created a duplicate term. Delete the dupe, and use the term_id
2626       * and term_taxonomy_id of the older term instead. Then return out of the function so that the "create" hooks
2627       * are not fired.
2628       */
2629      $duplicate_term = $wpdb->get_row( $wpdb->prepare( "SELECT t.term_id, t.slug, tt.term_taxonomy_id, tt.taxonomy FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON ( tt.term_id = t.term_id ) WHERE t.slug = %s AND tt.parent = %d AND tt.taxonomy = %s AND t.term_id < %d AND tt.term_taxonomy_id != %d", $slug, $parent, $taxonomy, $term_id, $tt_id ) );
2630  
2631      /**
2632       * Filters the duplicate term check that takes place during term creation.
2633       *
2634       * Term parent + taxonomy + slug combinations are meant to be unique, and wp_insert_term()
2635       * performs a last-minute confirmation of this uniqueness before allowing a new term
2636       * to be created. Plugins with different uniqueness requirements may use this filter
2637       * to bypass or modify the duplicate-term check.
2638       *
2639       * @since 5.1.0
2640       *
2641       * @param object $duplicate_term Duplicate term row from terms table, if found.
2642       * @param string $term           Term being inserted.
2643       * @param string $taxonomy       Taxonomy name.
2644       * @param array  $args           Arguments passed to wp_insert_term().
2645       * @param int    $tt_id          term_taxonomy_id for the newly created term.
2646       */
2647      $duplicate_term = apply_filters( 'wp_insert_term_duplicate_term_check', $duplicate_term, $term, $taxonomy, $args, $tt_id );
2648  
2649      if ( $duplicate_term ) {
2650          $wpdb->delete( $wpdb->terms, array( 'term_id' => $term_id ) );
2651          $wpdb->delete( $wpdb->term_taxonomy, array( 'term_taxonomy_id' => $tt_id ) );
2652  
2653          $term_id = (int) $duplicate_term->term_id;
2654          $tt_id   = (int) $duplicate_term->term_taxonomy_id;
2655  
2656          clean_term_cache( $term_id, $taxonomy );
2657          return array(
2658              'term_id'          => $term_id,
2659              'term_taxonomy_id' => $tt_id,
2660          );
2661      }
2662  
2663      /**
2664       * Fires immediately after a new term is created, before the term cache is cleaned.
2665       *
2666       * The {@see 'create_$taxonomy'} hook is also available for targeting a specific
2667       * taxonomy.
2668       *
2669       * @since 2.3.0
2670       * @since 6.1.0 The `$args` parameter was added.
2671       *
2672       * @param int    $term_id  Term ID.
2673       * @param int    $tt_id    Term taxonomy ID.
2674       * @param string $taxonomy Taxonomy slug.
2675       * @param array  $args     Arguments passed to wp_insert_term().
2676       */
2677      do_action( 'create_term', $term_id, $tt_id, $taxonomy, $args );
2678  
2679      /**
2680       * Fires after a new term is created for a specific taxonomy.
2681       *
2682       * The dynamic portion of the hook name, `$taxonomy`, refers
2683       * to the slug of the taxonomy the term was created for.
2684       *
2685       * Possible hook names include:
2686       *
2687       *  - `create_category`
2688       *  - `create_post_tag`
2689       *
2690       * @since 2.3.0
2691       * @since 6.1.0 The `$args` parameter was added.
2692       *
2693       * @param int   $term_id Term ID.
2694       * @param int   $tt_id   Term taxonomy ID.
2695       * @param array $args    Arguments passed to wp_insert_term().
2696       */
2697      do_action( "create_{$taxonomy}", $term_id, $tt_id, $args );
2698  
2699      /**
2700       * Filters the term ID after a new term is created.
2701       *
2702       * @since 2.3.0
2703       * @since 6.1.0 The `$args` parameter was added.
2704       *
2705       * @param int   $term_id Term ID.
2706       * @param int   $tt_id   Term taxonomy ID.
2707       * @param array $args    Arguments passed to wp_insert_term().
2708       */
2709      $term_id = apply_filters( 'term_id_filter', $term_id, $tt_id, $args );
2710  
2711      clean_term_cache( $term_id, $taxonomy );
2712  
2713      /**
2714       * Fires after a new term is created, and after the term cache has been cleaned.
2715       *
2716       * The {@see 'created_$taxonomy'} hook is also available for targeting a specific
2717       * taxonomy.
2718       *
2719       * @since 2.3.0
2720       * @since 6.1.0 The `$args` parameter was added.
2721       *
2722       * @param int    $term_id  Term ID.
2723       * @param int    $tt_id    Term taxonomy ID.
2724       * @param string $taxonomy Taxonomy slug.
2725       * @param array  $args     Arguments passed to wp_insert_term().
2726       */
2727      do_action( 'created_term', $term_id, $tt_id, $taxonomy, $args );
2728  
2729      /**
2730       * Fires after a new term in a specific taxonomy is created, and after the term
2731       * cache has been cleaned.
2732       *
2733       * The dynamic portion of the hook name, `$taxonomy`, refers to the taxonomy slug.
2734       *
2735       * Possible hook names include:
2736       *
2737       *  - `created_category`
2738       *  - `created_post_tag`
2739       *
2740       * @since 2.3.0
2741       * @since 6.1.0 The `$args` parameter was added.
2742       *
2743       * @param int   $term_id Term ID.
2744       * @param int   $tt_id   Term taxonomy ID.
2745       * @param array $args    Arguments passed to wp_insert_term().
2746       */
2747      do_action( "created_{$taxonomy}", $term_id, $tt_id, $args );
2748  
2749      /**
2750       * Fires after a term has been saved, and the term cache has been cleared.
2751       *
2752       * The {@see 'saved_$taxonomy'} hook is also available for targeting a specific
2753       * taxonomy.
2754       *
2755       * @since 5.5.0
2756       * @since 6.1.0 The `$args` parameter was added.
2757       *
2758       * @param int    $term_id  Term ID.
2759       * @param int    $tt_id    Term taxonomy ID.
2760       * @param string $taxonomy Taxonomy slug.
2761       * @param bool   $update   Whether this is an existing term being updated.
2762       * @param array  $args     Arguments passed to wp_insert_term().
2763       */
2764      do_action( 'saved_term', $term_id, $tt_id, $taxonomy, false, $args );
2765  
2766      /**
2767       * Fires after a term in a specific taxonomy has been saved, and the term
2768       * cache has been cleared.
2769       *
2770       * The dynamic portion of the hook name, `$taxonomy`, refers to the taxonomy slug.
2771       *
2772       * Possible hook names include:
2773       *
2774       *  - `saved_category`
2775       *  - `saved_post_tag`
2776       *
2777       * @since 5.5.0
2778       * @since 6.1.0 The `$args` parameter was added.
2779       *
2780       * @param int   $term_id Term ID.
2781       * @param int   $tt_id   Term taxonomy ID.
2782       * @param bool  $update  Whether this is an existing term being updated.
2783       * @param array $args    Arguments passed to wp_insert_term().
2784       */
2785      do_action( "saved_{$taxonomy}", $term_id, $tt_id, false, $args );
2786  
2787      return array(
2788          'term_id'          => $term_id,
2789          'term_taxonomy_id' => $tt_id,
2790      );
2791  }
2792  
2793  /**
2794   * Creates term and taxonomy relationships.
2795   *
2796   * Relates an object (post, link, etc.) to a term and taxonomy type. Creates the
2797   * term and taxonomy relationship if it doesn't already exist. Creates a term if
2798   * it doesn't exist (using the slug).
2799   *
2800   * A relationship means that the term is grouped in or belongs to the taxonomy.
2801   * A term has no meaning until it is given context by defining which taxonomy it
2802   * exists under.
2803   *
2804   * @since 2.3.0
2805   *
2806   * @global wpdb $wpdb WordPress database abstraction object.
2807   *
2808   * @param int              $object_id The object to relate to.
2809   * @param string|int|array $terms     A single term slug, single term ID, or array of either term slugs or IDs.
2810   *                                    Will replace all existing related terms in this taxonomy. Passing an
2811   *                                    empty array will remove all related terms.
2812   * @param string           $taxonomy  The context in which to relate the term to the object.
2813   * @param bool             $append    Optional. If false will delete difference of terms. Default false.
2814   * @return array|WP_Error Term taxonomy IDs of the affected terms or WP_Error on failure.
2815   */
2816  function wp_set_object_terms( $object_id, $terms, $taxonomy, $append = false ) {
2817      global $wpdb;
2818  
2819      $object_id = (int) $object_id;
2820  
2821      if ( ! taxonomy_exists( $taxonomy ) ) {
2822          return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
2823      }
2824  
2825      if ( empty( $terms ) ) {
2826          $terms = array();
2827      } elseif ( ! is_array( $terms ) ) {
2828          $terms = array( $terms );
2829      }
2830  
2831      if ( ! $append ) {
2832          $old_tt_ids = wp_get_object_terms(
2833              $object_id,
2834              $taxonomy,
2835              array(
2836                  'fields'                 => 'tt_ids',
2837                  'orderby'                => 'none',
2838                  'update_term_meta_cache' => false,
2839              )
2840          );
2841      } else {
2842          $old_tt_ids = array();
2843      }
2844  
2845      $tt_ids     = array();
2846      $new_tt_ids = array();
2847  
2848      foreach ( (array) $terms as $term ) {
2849          if ( '' === trim( $term ) ) {
2850              continue;
2851          }
2852  
2853          $term_info = term_exists( $term, $taxonomy );
2854  
2855          if ( ! $term_info ) {
2856              // Skip if a non-existent term ID is passed.
2857              if ( is_int( $term ) ) {
2858                  continue;
2859              }
2860  
2861              $term_info = wp_insert_term( $term, $taxonomy );
2862          }
2863  
2864          if ( is_wp_error( $term_info ) ) {
2865              return $term_info;
2866          }
2867  
2868          $tt_id    = $term_info['term_taxonomy_id'];
2869          $tt_ids[] = $tt_id;
2870  
2871          if ( $wpdb->get_var( $wpdb->prepare( "SELECT term_taxonomy_id FROM $wpdb->term_relationships WHERE object_id = %d AND term_taxonomy_id = %d", $object_id, $tt_id ) ) ) {
2872              continue;
2873          }
2874  
2875          /**
2876           * Fires immediately before an object-term relationship is added.
2877           *
2878           * @since 2.9.0
2879           * @since 4.7.0 Added the `$taxonomy` parameter.
2880           *
2881           * @param int    $object_id Object ID.
2882           * @param int    $tt_id     Term taxonomy ID.
2883           * @param string $taxonomy  Taxonomy slug.
2884           */
2885          do_action( 'add_term_relationship', $object_id, $tt_id, $taxonomy );
2886  
2887          $wpdb->insert(
2888              $wpdb->term_relationships,
2889              array(
2890                  'object_id'        => $object_id,
2891                  'term_taxonomy_id' => $tt_id,
2892              )
2893          );
2894  
2895          /**
2896           * Fires immediately after an object-term relationship is added.
2897           *
2898           * @since 2.9.0
2899           * @since 4.7.0 Added the `$taxonomy` parameter.
2900           *
2901           * @param int    $object_id Object ID.
2902           * @param int    $tt_id     Term taxonomy ID.
2903           * @param string $taxonomy  Taxonomy slug.
2904           */
2905          do_action( 'added_term_relationship', $object_id, $tt_id, $taxonomy );
2906  
2907          $new_tt_ids[] = $tt_id;
2908      }
2909  
2910      if ( $new_tt_ids ) {
2911          wp_update_term_count( $new_tt_ids, $taxonomy );
2912      }
2913  
2914      if ( ! $append ) {
2915          $delete_tt_ids = array_diff( $old_tt_ids, $tt_ids );
2916  
2917          if ( $delete_tt_ids ) {
2918              $in_delete_tt_ids = "'" . implode( "', '", $delete_tt_ids ) . "'";
2919              $delete_term_ids  = $wpdb->get_col( $wpdb->prepare( "SELECT tt.term_id FROM $wpdb->term_taxonomy AS tt WHERE tt.taxonomy = %s AND tt.term_taxonomy_id IN ($in_delete_tt_ids)", $taxonomy ) );
2920              $delete_term_ids  = array_map( 'intval', $delete_term_ids );
2921  
2922              $remove = wp_remove_object_terms( $object_id, $delete_term_ids, $taxonomy );
2923              if ( is_wp_error( $remove ) ) {
2924                  return $remove;
2925              }
2926          }
2927      }
2928  
2929      $t = get_taxonomy( $taxonomy );
2930  
2931      if ( ! $append && isset( $t->sort ) && $t->sort ) {
2932          $values     = array();
2933          $term_order = 0;
2934  
2935          $final_tt_ids = wp_get_object_terms(
2936              $object_id,
2937              $taxonomy,
2938              array(
2939                  'fields'                 => 'tt_ids',
2940                  'update_term_meta_cache' => false,
2941              )
2942          );
2943  
2944          foreach ( $tt_ids as $tt_id ) {
2945              if ( in_array( (int) $tt_id, $final_tt_ids, true ) ) {
2946                  $values[] = $wpdb->prepare( '(%d, %d, %d)', $object_id, $tt_id, ++$term_order );
2947              }
2948          }
2949  
2950          if ( $values ) {
2951              if ( false === $wpdb->query( "INSERT INTO $wpdb->term_relationships (object_id, term_taxonomy_id, term_order) VALUES " . implode( ',', $values ) . ' ON DUPLICATE KEY UPDATE term_order = VALUES(term_order)' ) ) {
2952                  return new WP_Error( 'db_insert_error', __( 'Could not insert term relationship into the database.' ), $wpdb->last_error );
2953              }
2954          }
2955      }
2956  
2957      wp_cache_delete( $object_id, $taxonomy . '_relationships' );
2958      wp_cache_set_terms_last_changed();
2959  
2960      /**
2961       * Fires after an object's terms have been set.
2962       *
2963       * @since 2.8.0
2964       *
2965       * @param int    $object_id  Object ID.
2966       * @param array  $terms      An array of object term IDs or slugs.
2967       * @param array  $tt_ids     An array of term taxonomy IDs.
2968       * @param string $taxonomy   Taxonomy slug.
2969       * @param bool   $append     Whether to append new terms to the old terms.
2970       * @param array  $old_tt_ids Old array of term taxonomy IDs.
2971       */
2972      do_action( 'set_object_terms', $object_id, $terms, $tt_ids, $taxonomy, $append, $old_tt_ids );
2973  
2974      return $tt_ids;
2975  }
2976  
2977  /**
2978   * Adds term(s) associated with a given object.
2979   *
2980   * @since 3.6.0
2981   *
2982   * @param int              $object_id The ID of the object to which the terms will be added.
2983   * @param string|int|array $terms     The slug(s) or ID(s) of the term(s) to add.
2984   * @param array|string     $taxonomy  Taxonomy name.
2985   * @return array|WP_Error Term taxonomy IDs of the affected terms.
2986   */
2987  function wp_add_object_terms( $object_id, $terms, $taxonomy ) {
2988      return wp_set_object_terms( $object_id, $terms, $taxonomy, true );
2989  }
2990  
2991  /**
2992   * Removes term(s) associated with a given object.
2993   *
2994   * @since 3.6.0
2995   *
2996   * @global wpdb $wpdb WordPress database abstraction object.
2997   *
2998   * @param int              $object_id The ID of the object from which the terms will be removed.
2999   * @param string|int|array $terms     The slug(s) or ID(s) of the term(s) to remove.
3000   * @param string           $taxonomy  Taxonomy name.
3001   * @return bool|WP_Error True on success, false or WP_Error on failure.
3002   */
3003  function wp_remove_object_terms( $object_id, $terms, $taxonomy ) {
3004      global $wpdb;
3005  
3006      $object_id = (int) $object_id;
3007  
3008      if ( ! taxonomy_exists( $taxonomy ) ) {
3009          return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
3010      }
3011  
3012      if ( ! is_array( $terms ) ) {
3013          $terms = array( $terms );
3014      }
3015  
3016      $tt_ids = array();
3017  
3018      foreach ( (array) $terms as $term ) {
3019          if ( '' === trim( $term ) ) {
3020              continue;
3021          }
3022  
3023          $term_info = term_exists( $term, $taxonomy );
3024          if ( ! $term_info ) {
3025              // Skip if a non-existent term ID is passed.
3026              if ( is_int( $term ) ) {
3027                  continue;
3028              }
3029          }
3030  
3031          if ( is_wp_error( $term_info ) ) {
3032              return $term_info;
3033          }
3034  
3035          $tt_ids[] = $term_info['term_taxonomy_id'];
3036      }
3037  
3038      if ( $tt_ids ) {
3039          $in_tt_ids = "'" . implode( "', '", $tt_ids ) . "'";
3040  
3041          /**
3042           * Fires immediately before an object-term relationship is deleted.
3043           *
3044           * @since 2.9.0
3045           * @since 4.7.0 Added the `$taxonomy` parameter.
3046           *
3047           * @param int    $object_id Object ID.
3048           * @param array  $tt_ids    An array of term taxonomy IDs.
3049           * @param string $taxonomy  Taxonomy slug.
3050           */
3051          do_action( 'delete_term_relationships', $object_id, $tt_ids, $taxonomy );
3052  
3053          $deleted = $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->term_relationships WHERE object_id = %d AND term_taxonomy_id IN ($in_tt_ids)", $object_id ) );
3054  
3055          wp_cache_delete( $object_id, $taxonomy . '_relationships' );
3056          wp_cache_set_terms_last_changed();
3057  
3058          /**
3059           * Fires immediately after an object-term relationship is deleted.
3060           *
3061           * @since 2.9.0
3062           * @since 4.7.0 Added the `$taxonomy` parameter.
3063           *
3064           * @param int    $object_id Object ID.
3065           * @param array  $tt_ids    An array of term taxonomy IDs.
3066           * @param string $taxonomy  Taxonomy slug.
3067           */
3068          do_action( 'deleted_term_relationships', $object_id, $tt_ids, $taxonomy );
3069  
3070          wp_update_term_count( $tt_ids, $taxonomy );
3071  
3072          return (bool) $deleted;
3073      }
3074  
3075      return false;
3076  }
3077  
3078  /**
3079   * Makes term slug unique, if it isn't already.
3080   *
3081   * The `$slug` has to be unique global to every taxonomy, meaning that one
3082   * taxonomy term can't have a matching slug with another taxonomy term. Each
3083   * slug has to be globally unique for every taxonomy.
3084   *
3085   * The way this works is that if the taxonomy that the term belongs to is
3086   * hierarchical and has a parent, it will append that parent to the $slug.
3087   *
3088   * If that still doesn't return a unique slug, then it tries to append a number
3089   * until it finds a number that is truly unique.
3090   *
3091   * The only purpose for `$term` is for appending a parent, if one exists.
3092   *
3093   * @since 2.3.0
3094   *
3095   * @global wpdb $wpdb WordPress database abstraction object.
3096   *
3097   * @param string $slug The string that will be tried for a unique slug.
3098   * @param object $term The term object that the `$slug` will belong to.
3099   * @return string Will return a true unique slug.
3100   */
3101  function wp_unique_term_slug( $slug, $term ) {
3102      global $wpdb;
3103  
3104      $needs_suffix  = true;
3105      $original_slug = $slug;
3106  
3107      // As of 4.1, duplicate slugs are allowed as long as they're in different taxonomies.
3108      if ( ! term_exists( $slug ) || get_option( 'db_version' ) >= 30133 && ! get_term_by( 'slug', $slug, $term->taxonomy ) ) {
3109          $needs_suffix = false;
3110      }
3111  
3112      /*
3113       * If the taxonomy supports hierarchy and the term has a parent, make the slug unique
3114       * by incorporating parent slugs.
3115       */
3116      $parent_suffix = '';
3117      if ( $needs_suffix && is_taxonomy_hierarchical( $term->taxonomy ) && ! empty( $term->parent ) ) {
3118          $the_parent = $term->parent;
3119          while ( ! empty( $the_parent ) ) {
3120              $parent_term = get_term( $the_parent, $term->taxonomy );
3121              if ( is_wp_error( $parent_term ) || empty( $parent_term ) ) {
3122                  break;
3123              }
3124              $parent_suffix .= '-' . $parent_term->slug;
3125              if ( ! term_exists( $slug . $parent_suffix ) ) {
3126                  break;
3127              }
3128  
3129              if ( empty( $parent_term->parent ) ) {
3130                  break;
3131              }
3132              $the_parent = $parent_term->parent;
3133          }
3134      }
3135  
3136      // If we didn't get a unique slug, try appending a number to make it unique.
3137  
3138      /**
3139       * Filters whether the proposed unique term slug is bad.
3140       *
3141       * @since 4.3.0
3142       *
3143       * @param bool   $needs_suffix Whether the slug needs to be made unique with a suffix.
3144       * @param string $slug         The slug.
3145       * @param object $term         Term object.
3146       */
3147      if ( apply_filters( 'wp_unique_term_slug_is_bad_slug', $needs_suffix, $slug, $term ) ) {
3148          if ( $parent_suffix ) {
3149              $slug .= $parent_suffix;
3150          }
3151  
3152          if ( ! empty( $term->term_id ) ) {
3153              $query = $wpdb->prepare( "SELECT slug FROM $wpdb->terms WHERE slug = %s AND term_id != %d", $slug, $term->term_id );
3154          } else {
3155              $query = $wpdb->prepare( "SELECT slug FROM $wpdb->terms WHERE slug = %s", $slug );
3156          }
3157  
3158          if ( $wpdb->get_var( $query ) ) { // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
3159              $num = 2;
3160              do {
3161                  $alt_slug = $slug . "-$num";
3162                  ++$num;
3163                  $slug_check = $wpdb->get_var( $wpdb->prepare( "SELECT slug FROM $wpdb->terms WHERE slug = %s", $alt_slug ) );
3164              } while ( $slug_check );
3165              $slug = $alt_slug;
3166          }
3167      }
3168  
3169      /**
3170       * Filters the unique term slug.
3171       *
3172       * @since 4.3.0
3173       *
3174       * @param string $slug          Unique term slug.
3175       * @param object $term          Term object.
3176       * @param string $original_slug Slug originally passed to the function for testing.
3177       */
3178      return apply_filters( 'wp_unique_term_slug', $slug, $term, $original_slug );
3179  }
3180  
3181  /**
3182   * Updates term based on arguments provided.
3183   *
3184   * The `$args` will indiscriminately override all values with the same field name.
3185   * Care must be taken to not override important information need to update or
3186   * update will fail (or perhaps create a new term, neither would be acceptable).
3187   *
3188   * Defaults will set 'alias_of', 'description', 'parent', and 'slug' if not
3189   * defined in `$args` already.
3190   *
3191   * 'alias_of' will create a term group, if it doesn't already exist, and
3192   * update it for the `$term`.
3193   *
3194   * If the 'slug' argument in `$args` is missing, then the 'name' will be used.
3195   * If you set 'slug' and it isn't unique, then a WP_Error is returned.
3196   * If you don't pass any slug, then a unique one will be created.
3197   *
3198   * @since 2.3.0
3199   *
3200   * @global wpdb $wpdb WordPress database abstraction object.
3201   *
3202   * @param int          $term_id  The ID of the term.
3203   * @param string       $taxonomy The taxonomy of the term.
3204   * @param array        $args {
3205   *     Optional. Array of arguments for updating a term.
3206   *
3207   *     @type string $alias_of    Slug of the term to make this term an alias of.
3208   *                               Default empty string. Accepts a term slug.
3209   *     @type string $description The term description. Default empty string.
3210   *     @type int    $parent      The id of the parent term. Default 0.
3211   *     @type string $slug        The term slug to use. Default empty string.
3212   * }
3213   * @return array|WP_Error An array containing the `term_id` and `term_taxonomy_id`,
3214   *                        WP_Error otherwise.
3215   */
3216  function wp_update_term( $term_id, $taxonomy, $args = array() ) {
3217      global $wpdb;
3218  
3219      if ( ! taxonomy_exists( $taxonomy ) ) {
3220          return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
3221      }
3222  
3223      $term_id = (int) $term_id;
3224  
3225      // First, get all of the original args.
3226      $term = get_term( $term_id, $taxonomy );
3227  
3228      if ( is_wp_error( $term ) ) {
3229          return $term;
3230      }
3231  
3232      if ( ! $term ) {
3233          return new WP_Error( 'invalid_term', __( 'Empty Term.' ) );
3234      }
3235  
3236      $term = (array) $term->data;
3237  
3238      // Escape data pulled from DB.
3239      $term = wp_slash( $term );
3240  
3241      // Merge old and new args with new args overwriting old ones.
3242      $args = array_merge( $term, $args );
3243  
3244      $defaults    = array(
3245          'alias_of'    => '',
3246          'description' => '',
3247          'parent'      => 0,
3248          'slug'        => '',
3249      );
3250      $args        = wp_parse_args( $args, $defaults );
3251      $args        = sanitize_term( $args, $taxonomy, 'db' );
3252      $parsed_args = $args;
3253  
3254      // expected_slashed ($name)
3255      $name        = wp_unslash( $args['name'] );
3256      $description = wp_unslash( $args['description'] );
3257  
3258      $parsed_args['name']        = $name;
3259      $parsed_args['description'] = $description;
3260  
3261      if ( '' === trim( $name ) ) {
3262          return new WP_Error( 'empty_term_name', __( 'A name is required for this term.' ) );
3263      }
3264  
3265      if ( (int) $parsed_args['parent'] > 0 && ! term_exists( (int) $parsed_args['parent'] ) ) {
3266          return new WP_Error( 'missing_parent', __( 'Parent term does not exist.' ) );
3267      }
3268  
3269      $empty_slug = false;
3270      if ( empty( $args['slug'] ) ) {
3271          $empty_slug = true;
3272          $slug       = sanitize_title( $name );
3273      } else {
3274          $slug = $args['slug'];
3275      }
3276  
3277      $parsed_args['slug'] = $slug;
3278  
3279      $term_group = isset( $parsed_args['term_group'] ) ? $parsed_args['term_group'] : 0;
3280      if ( $args['alias_of'] ) {
3281          $alias = get_term_by( 'slug', $args['alias_of'], $taxonomy );
3282          if ( ! empty( $alias->term_group ) ) {
3283              // The alias we want is already in a group, so let's use that one.
3284              $term_group = $alias->term_group;
3285          } elseif ( ! empty( $alias->term_id ) ) {
3286              /*
3287               * The alias is not in a group, so we create a new one
3288               * and add the alias to it.
3289               */
3290              $term_group = $wpdb->get_var( "SELECT MAX(term_group) FROM $wpdb->terms" ) + 1;
3291  
3292              wp_update_term(
3293                  $alias->term_id,
3294                  $taxonomy,
3295                  array(
3296                      'term_group' => $term_group,
3297                  )
3298              );
3299          }
3300  
3301          $parsed_args['term_group'] = $term_group;
3302      }
3303  
3304      /**
3305       * Filters the term parent.
3306       *
3307       * Hook to this filter to see if it will cause a hierarchy loop.
3308       *
3309       * @since 3.1.0
3310       *
3311       * @param int    $parent_term ID of the parent term.
3312       * @param int    $term_id     Term ID.
3313       * @param string $taxonomy    Taxonomy slug.
3314       * @param array  $parsed_args An array of potentially altered update arguments for the given term.
3315       * @param array  $args        Arguments passed to wp_update_term().
3316       */
3317      $parent = (int) apply_filters( 'wp_update_term_parent', $args['parent'], $term_id, $taxonomy, $parsed_args, $args );
3318  
3319      // Check for duplicate slug.
3320      $duplicate = get_term_by( 'slug', $slug, $taxonomy );
3321      if ( $duplicate && $duplicate->term_id !== $term_id ) {
3322          /*
3323           * If an empty slug was passed or the parent changed, reset the slug to something unique.
3324           * Otherwise, bail.
3325           */
3326          if ( $empty_slug || ( $parent !== (int) $term['parent'] ) ) {
3327              $slug = wp_unique_term_slug( $slug, (object) $args );
3328          } else {
3329              /* translators: %s: Taxonomy term slug. */
3330              return new WP_Error( 'duplicate_term_slug', sprintf( __( 'The slug &#8220;%s&#8221; is already in use by another term.' ), $slug ) );
3331          }
3332      }
3333  
3334      $tt_id = (int) $wpdb->get_var( $wpdb->prepare( "SELECT tt.term_taxonomy_id FROM $wpdb->term_taxonomy AS tt INNER JOIN $wpdb->terms AS t ON tt.term_id = t.term_id WHERE tt.taxonomy = %s AND t.term_id = %d", $taxonomy, $term_id ) );
3335  
3336      // Check whether this is a shared term that needs splitting.
3337      $_term_id = _split_shared_term( $term_id, $tt_id );
3338      if ( ! is_wp_error( $_term_id ) ) {
3339          $term_id = $_term_id;
3340      }
3341  
3342      /**
3343       * Fires immediately before the given terms are edited.
3344       *
3345       * @since 2.9.0
3346       * @since 6.1.0 The `$args` parameter was added.
3347       *
3348       * @param int    $term_id  Term ID.
3349       * @param string $taxonomy Taxonomy slug.
3350       * @param array  $args     Arguments passed to wp_update_term().
3351       */
3352      do_action( 'edit_terms', $term_id, $taxonomy, $args );
3353  
3354      $data = compact( 'name', 'slug', 'term_group' );
3355  
3356      /**
3357       * Filters term data before it is updated in the database.
3358       *
3359       * @since 4.7.0
3360       *
3361       * @param array  $data     Term data to be updated.
3362       * @param int    $term_id  Term ID.
3363       * @param string $taxonomy Taxonomy slug.
3364       * @param array  $args     Arguments passed to wp_update_term().
3365       */
3366      $data = apply_filters( 'wp_update_term_data', $data, $term_id, $taxonomy, $args );
3367  
3368      $wpdb->update( $wpdb->terms, $data, compact( 'term_id' ) );
3369  
3370      if ( empty( $slug ) ) {
3371          $slug = sanitize_title( $name, $term_id );
3372          $wpdb->update( $wpdb->terms, compact( 'slug' ), compact( 'term_id' ) );
3373      }
3374  
3375      /**
3376       * Fires immediately after a term is updated in the database, but before its
3377       * term-taxonomy relationship is updated.
3378       *
3379       * @since 2.9.0
3380       * @since 6.1.0 The `$args` parameter was added.
3381       *
3382       * @param int    $term_id  Term ID.
3383       * @param string $taxonomy Taxonomy slug.
3384       * @param array  $args     Arguments passed to wp_update_term().
3385       */
3386      do_action( 'edited_terms', $term_id, $taxonomy, $args );
3387  
3388      /**
3389       * Fires immediate before a term-taxonomy relationship is updated.
3390       *
3391       * @since 2.9.0
3392       * @since 6.1.0 The `$args` parameter was added.
3393       *
3394       * @param int    $tt_id    Term taxonomy ID.
3395       * @param string $taxonomy Taxonomy slug.
3396       * @param array  $args     Arguments passed to wp_update_term().
3397       */
3398      do_action( 'edit_term_taxonomy', $tt_id, $taxonomy, $args );
3399  
3400      $wpdb->update( $wpdb->term_taxonomy, compact( 'term_id', 'taxonomy', 'description', 'parent' ), array( 'term_taxonomy_id' => $tt_id ) );
3401  
3402      /**
3403       * Fires immediately after a term-taxonomy relationship is updated.
3404       *
3405       * @since 2.9.0
3406       * @since 6.1.0 The `$args` parameter was added.
3407       *
3408       * @param int    $tt_id    Term taxonomy ID.
3409       * @param string $taxonomy Taxonomy slug.
3410       * @param array  $args     Arguments passed to wp_update_term().
3411       */
3412      do_action( 'edited_term_taxonomy', $tt_id, $taxonomy, $args );
3413  
3414      /**
3415       * Fires after a term has been updated, but before the term cache has been cleaned.
3416       *
3417       * The {@see 'edit_$taxonomy'} hook is also available for targeting a specific
3418       * taxonomy.
3419       *
3420       * @since 2.3.0
3421       * @since 6.1.0 The `$args` parameter was added.
3422       *
3423       * @param int    $term_id  Term ID.
3424       * @param int    $tt_id    Term taxonomy ID.
3425       * @param string $taxonomy Taxonomy slug.
3426       * @param array  $args     Arguments passed to wp_update_term().
3427       */
3428      do_action( 'edit_term', $term_id, $tt_id, $taxonomy, $args );
3429  
3430      /**
3431       * Fires after a term in a specific taxonomy has been updated, but before the term
3432       * cache has been cleaned.
3433       *
3434       * The dynamic portion of the hook name, `$taxonomy`, refers to the taxonomy slug.
3435       *
3436       * Possible hook names include:
3437       *
3438       *  - `edit_category`
3439       *  - `edit_post_tag`
3440       *
3441       * @since 2.3.0
3442       * @since 6.1.0 The `$args` parameter was added.
3443       *
3444       * @param int   $term_id Term ID.
3445       * @param int   $tt_id   Term taxonomy ID.
3446       * @param array $args    Arguments passed to wp_update_term().
3447       */
3448      do_action( "edit_{$taxonomy}", $term_id, $tt_id, $args );
3449  
3450      /** This filter is documented in wp-includes/taxonomy.php */
3451      $term_id = apply_filters( 'term_id_filter', $term_id, $tt_id );
3452  
3453      clean_term_cache( $term_id, $taxonomy );
3454  
3455      /**
3456       * Fires after a term has been updated, and the term cache has been cleaned.
3457       *
3458       * The {@see 'edited_$taxonomy'} hook is also available for targeting a specific
3459       * taxonomy.
3460       *
3461       * @since 2.3.0
3462       * @since 6.1.0 The `$args` parameter was added.
3463       *
3464       * @param int    $term_id  Term ID.
3465       * @param int    $tt_id    Term taxonomy ID.
3466       * @param string $taxonomy Taxonomy slug.
3467       * @param array  $args     Arguments passed to wp_update_term().
3468       */
3469      do_action( 'edited_term', $term_id, $tt_id, $taxonomy, $args );
3470  
3471      /**
3472       * Fires after a term for a specific taxonomy has been updated, and the term
3473       * cache has been cleaned.
3474       *
3475       * The dynamic portion of the hook name, `$taxonomy`, refers to the taxonomy slug.
3476       *
3477       * Possible hook names include:
3478       *
3479       *  - `edited_category`
3480       *  - `edited_post_tag`
3481       *
3482       * @since 2.3.0
3483       * @since 6.1.0 The `$args` parameter was added.
3484       *
3485       * @param int   $term_id Term ID.
3486       * @param int   $tt_id   Term taxonomy ID.
3487       * @param array $args    Arguments passed to wp_update_term().
3488       */
3489      do_action( "edited_{$taxonomy}", $term_id, $tt_id, $args );
3490  
3491      /** This action is documented in wp-includes/taxonomy.php */
3492      do_action( 'saved_term', $term_id, $tt_id, $taxonomy, true, $args );
3493  
3494      /** This action is documented in wp-includes/taxonomy.php */
3495      do_action( "saved_{$taxonomy}", $term_id, $tt_id, true, $args );
3496  
3497      return array(
3498          'term_id'          => $term_id,
3499          'term_taxonomy_id' => $tt_id,
3500      );
3501  }
3502  
3503  /**
3504   * Enables or disables term counting.
3505   *
3506   * @since 2.5.0
3507   *
3508   * @param bool $defer Optional. Enable if true, disable if false.
3509   * @return bool Whether term counting is enabled or disabled.
3510   */
3511  function wp_defer_term_counting( $defer = null ) {
3512      static $_defer = false;
3513  
3514      if ( is_bool( $defer ) ) {
3515          $_defer = $defer;
3516          // Flush any deferred counts.
3517          if ( ! $defer ) {
3518              wp_update_term_count( null, null, true );
3519          }
3520      }
3521  
3522      return $_defer;
3523  }
3524  
3525  /**
3526   * Updates the amount of terms in taxonomy.
3527   *
3528   * If there is a taxonomy callback applied, then it will be called for updating
3529   * the count.
3530   *
3531   * The default action is to count what the amount of terms have the relationship
3532   * of term ID. Once that is done, then update the database.
3533   *
3534   * @since 2.3.0
3535   *
3536   * @param int|array $terms       The term_taxonomy_id of the terms.
3537   * @param string    $taxonomy    The context of the term.
3538   * @param bool      $do_deferred Whether to flush the deferred term counts too. Default false.
3539   * @return bool If no terms will return false, and if successful will return true.
3540   */
3541  function wp_update_term_count( $terms, $taxonomy, $do_deferred = false ) {
3542      static $_deferred = array();
3543  
3544      if ( $do_deferred ) {
3545          foreach ( (array) array_keys( $_deferred ) as $tax ) {
3546              wp_update_term_count_now( $_deferred[ $tax ], $tax );
3547              unset( $_deferred[ $tax ] );
3548          }
3549      }
3550  
3551      if ( empty( $terms ) ) {
3552          return false;
3553      }
3554  
3555      if ( ! is_array( $terms ) ) {
3556          $terms = array( $terms );
3557      }
3558  
3559      if ( wp_defer_term_counting() ) {
3560          if ( ! isset( $_deferred[ $taxonomy ] ) ) {
3561              $_deferred[ $taxonomy ] = array();
3562          }
3563          $_deferred[ $taxonomy ] = array_unique( array_merge( $_deferred[ $taxonomy ], $terms ) );
3564          return true;
3565      }
3566  
3567      return wp_update_term_count_now( $terms, $taxonomy );
3568  }
3569  
3570  /**
3571   * Performs term count update immediately.
3572   *
3573   * @since 2.5.0
3574   *
3575   * @param array  $terms    The term_taxonomy_id of terms to update.
3576   * @param string $taxonomy The context of the term.
3577   * @return true Always true when complete.
3578   */
3579  function wp_update_term_count_now( $terms, $taxonomy ) {
3580      $terms = array_map( 'intval', $terms );
3581  
3582      $taxonomy = get_taxonomy( $taxonomy );
3583      if ( ! empty( $taxonomy->update_count_callback ) ) {
3584          call_user_func( $taxonomy->update_count_callback, $terms, $taxonomy );
3585      } else {
3586          $object_types = (array) $taxonomy->object_type;
3587          foreach ( $object_types as &$object_type ) {
3588              if ( str_starts_with( $object_type, 'attachment:' ) ) {
3589                  list( $object_type ) = explode( ':', $object_type );
3590              }
3591          }
3592  
3593          if ( array_filter( $object_types, 'post_type_exists' ) == $object_types ) {
3594              // Only post types are attached to this taxonomy.
3595              _update_post_term_count( $terms, $taxonomy );
3596          } else {
3597              // Default count updater.
3598              _update_generic_term_count( $terms, $taxonomy );
3599          }
3600      }
3601  
3602      clean_term_cache( $terms, '', false );
3603  
3604      return true;
3605  }
3606  
3607  //
3608  // Cache.
3609  //
3610  
3611  /**
3612   * Removes the taxonomy relationship to terms from the cache.
3613   *
3614   * Will remove the entire taxonomy relationship containing term `$object_id`. The
3615   * term IDs have to exist within the taxonomy `$object_type` for the deletion to
3616   * take place.
3617   *
3618   * @since 2.3.0
3619   *
3620   * @global bool $_wp_suspend_cache_invalidation
3621   *
3622   * @see get_object_taxonomies() for more on $object_type.
3623   *
3624   * @param int|array    $object_ids  Single or list of term object ID(s).
3625   * @param array|string $object_type The taxonomy object type.
3626   */
3627  function clean_object_term_cache( $object_ids, $object_type ) {
3628      global $_wp_suspend_cache_invalidation;
3629  
3630      if ( ! empty( $_wp_suspend_cache_invalidation ) ) {
3631          return;
3632      }
3633  
3634      if ( ! is_array( $object_ids ) ) {
3635          $object_ids = array( $object_ids );
3636      }
3637  
3638      $taxonomies = get_object_taxonomies( $object_type );
3639  
3640      foreach ( $taxonomies as $taxonomy ) {
3641          wp_cache_delete_multiple( $object_ids, "{$taxonomy}_relationships" );
3642      }
3643  
3644      wp_cache_set_terms_last_changed();
3645  
3646      /**
3647       * Fires after the object term cache has been cleaned.
3648       *
3649       * @since 2.5.0
3650       *
3651       * @param array  $object_ids An array of object IDs.
3652       * @param string $object_type Object type.
3653       */
3654      do_action( 'clean_object_term_cache', $object_ids, $object_type );
3655  }
3656  
3657  /**
3658   * Removes all of the term IDs from the cache.
3659   *
3660   * @since 2.3.0
3661   *
3662   * @global wpdb $wpdb                           WordPress database abstraction object.
3663   * @global bool $_wp_suspend_cache_invalidation
3664   *
3665   * @param int|int[] $ids            Single or array of term IDs.
3666   * @param string    $taxonomy       Optional. Taxonomy slug. Can be empty, in which case the taxonomies of the passed
3667   *                                  term IDs will be used. Default empty.
3668   * @param bool      $clean_taxonomy Optional. Whether to clean taxonomy wide caches (true), or just individual
3669   *                                  term object caches (false). Default true.
3670   */
3671  function clean_term_cache( $ids, $taxonomy = '', $clean_taxonomy = true ) {
3672      global $wpdb, $_wp_suspend_cache_invalidation;
3673  
3674      if ( ! empty( $_wp_suspend_cache_invalidation ) ) {
3675          return;
3676      }
3677  
3678      if ( ! is_array( $ids ) ) {
3679          $ids = array( $ids );
3680      }
3681  
3682      $taxonomies = array();
3683      // If no taxonomy, assume tt_ids.
3684      if ( empty( $taxonomy ) ) {
3685          $tt_ids = array_map( 'intval', $ids );
3686          $tt_ids = implode( ', ', $tt_ids );
3687          $terms  = $wpdb->get_results( "SELECT term_id, taxonomy FROM $wpdb->term_taxonomy WHERE term_taxonomy_id IN ($tt_ids)" );
3688          $ids    = array();
3689  
3690          foreach ( (array) $terms as $term ) {
3691              $taxonomies[] = $term->taxonomy;
3692              $ids[]        = $term->term_id;
3693          }
3694          wp_cache_delete_multiple( $ids, 'terms' );
3695          $taxonomies = array_unique( $taxonomies );
3696      } else {
3697          wp_cache_delete_multiple( $ids, 'terms' );
3698          $taxonomies = array( $taxonomy );
3699      }
3700  
3701      foreach ( $taxonomies as $taxonomy ) {
3702          if ( $clean_taxonomy ) {
3703              clean_taxonomy_cache( $taxonomy );
3704          }
3705  
3706          /**
3707           * Fires once after each taxonomy's term cache has been cleaned.
3708           *
3709           * @since 2.5.0
3710           * @since 4.5.0 Added the `$clean_taxonomy` parameter.
3711           *
3712           * @param array  $ids            An array of term IDs.
3713           * @param string $taxonomy       Taxonomy slug.
3714           * @param bool   $clean_taxonomy Whether or not to clean taxonomy-wide caches
3715           */
3716          do_action( 'clean_term_cache', $ids, $taxonomy, $clean_taxonomy );
3717      }
3718  
3719      wp_cache_set_terms_last_changed();
3720  }
3721  
3722  /**
3723   * Cleans the caches for a taxonomy.
3724   *
3725   * @since 4.9.0
3726   *
3727   * @param string $taxonomy Taxonomy slug.
3728   */
3729  function clean_taxonomy_cache( $taxonomy ) {
3730      wp_cache_delete( 'all_ids', $taxonomy );
3731      wp_cache_delete( 'get', $taxonomy );
3732      wp_cache_set_terms_last_changed();
3733  
3734      // Regenerate cached hierarchy.
3735      delete_option( "{$taxonomy}_children" );
3736      _get_term_hierarchy( $taxonomy );
3737  
3738      /**
3739       * Fires after a taxonomy's caches have been cleaned.
3740       *
3741       * @since 4.9.0
3742       *
3743       * @param string $taxonomy Taxonomy slug.
3744       */
3745      do_action( 'clean_taxonomy_cache', $taxonomy );
3746  }
3747  
3748  /**
3749   * Retrieves the cached term objects for the given object ID.
3750   *
3751   * Upstream functions (like get_the_terms() and is_object_in_term()) are
3752   * responsible for populating the object-term relationship cache. The current
3753   * function only fetches relationship data that is already in the cache.
3754   *
3755   * @since 2.3.0
3756   * @since 4.7.0 Returns a `WP_Error` object if there's an error with
3757   *              any of the matched terms.
3758   *
3759   * @param int    $id       Term object ID, for example a post, comment, or user ID.
3760   * @param string $taxonomy Taxonomy name.
3761   * @return bool|WP_Term[]|WP_Error Array of `WP_Term` objects, if cached.
3762   *                                 False if cache is empty for `$taxonomy` and `$id`.
3763   *                                 WP_Error if get_term() returns an error object for any term.
3764   */
3765  function get_object_term_cache( $id, $taxonomy ) {
3766      $_term_ids = wp_cache_get( $id, "{$taxonomy}_relationships" );
3767  
3768      // We leave the priming of relationship caches to upstream functions.
3769      if ( false === $_term_ids ) {
3770          return false;
3771      }
3772  
3773      // Backward compatibility for if a plugin is putting objects into the cache, rather than IDs.
3774      $term_ids = array();
3775      foreach ( $_term_ids as $term_id ) {
3776          if ( is_numeric( $term_id ) ) {
3777              $term_ids[] = (int) $term_id;
3778          } elseif ( isset( $term_id->term_id ) ) {
3779              $term_ids[] = (int) $term_id->term_id;
3780          }
3781      }
3782  
3783      // Fill the term objects.
3784      _prime_term_caches( $term_ids );
3785  
3786      $terms = array();
3787      foreach ( $term_ids as $term_id ) {
3788          $term = get_term( $term_id, $taxonomy );
3789          if ( is_wp_error( $term ) ) {
3790              return $term;
3791          }
3792  
3793          $terms[] = $term;
3794      }
3795  
3796      return $terms;
3797  }
3798  
3799  /**
3800   * Updates the cache for the given term object ID(s).
3801   *
3802   * Note: Due to performance concerns, great care should be taken to only update
3803   * term caches when necessary. Processing time can increase exponentially depending
3804   * on both the number of passed term IDs and the number of taxonomies those terms
3805   * belong to.
3806   *
3807   * Caches will only be updated for terms not already cached.
3808   *
3809   * @since 2.3.0
3810   *
3811   * @param string|int[]    $object_ids  Comma-separated list or array of term object IDs.
3812   * @param string|string[] $object_type The taxonomy object type or array of the same.
3813   * @return void|false Void on success or if the `$object_ids` parameter is empty,
3814   *                    false if all of the terms in `$object_ids` are already cached.
3815   */
3816  function update_object_term_cache( $object_ids, $object_type ) {
3817      if ( empty( $object_ids ) ) {
3818          return;
3819      }
3820  
3821      if ( ! is_array( $object_ids ) ) {
3822          $object_ids = explode( ',', $object_ids );
3823      }
3824  
3825      $object_ids     = array_map( 'intval', $object_ids );
3826      $non_cached_ids = array();
3827  
3828      $taxonomies = get_object_taxonomies( $object_type );
3829  
3830      foreach ( $taxonomies as $taxonomy ) {
3831          $cache_values = wp_cache_get_multiple( (array) $object_ids, "{$taxonomy}_relationships" );
3832  
3833          foreach ( $cache_values as $id => $value ) {
3834              if ( false === $value ) {
3835                  $non_cached_ids[] = $id;
3836              }
3837          }
3838      }
3839  
3840      if ( empty( $non_cached_ids ) ) {
3841          return false;
3842      }
3843  
3844      $non_cached_ids = array_unique( $non_cached_ids );
3845  
3846      $terms = wp_get_object_terms(
3847          $non_cached_ids,
3848          $taxonomies,
3849          array(
3850              'fields'                 => 'all_with_object_id',
3851              'orderby'                => 'name',
3852              'update_term_meta_cache' => false,
3853          )
3854      );
3855  
3856      $object_terms = array();
3857      foreach ( (array) $terms as $term ) {
3858          $object_terms[ $term->object_id ][ $term->taxonomy ][] = $term->term_id;
3859      }
3860  
3861      foreach ( $non_cached_ids as $id ) {
3862          foreach ( $taxonomies as $taxonomy ) {
3863              if ( ! isset( $object_terms[ $id ][ $taxonomy ] ) ) {
3864                  if ( ! isset( $object_terms[ $id ] ) ) {
3865                      $object_terms[ $id ] = array();
3866                  }
3867                  $object_terms[ $id ][ $taxonomy ] = array();
3868              }
3869          }
3870      }
3871  
3872      $cache_values = array();
3873      foreach ( $object_terms as $id => $value ) {
3874          foreach ( $value as $taxonomy => $terms ) {
3875              $cache_values[ $taxonomy ][ $id ] = $terms;
3876          }
3877      }
3878      foreach ( $cache_values as $taxonomy => $data ) {
3879          wp_cache_add_multiple( $data, "{$taxonomy}_relationships" );
3880      }
3881  }
3882  
3883  /**
3884   * Updates terms in cache.
3885   *
3886   * @since 2.3.0
3887   *
3888   * @param WP_Term[] $terms    Array of term objects to change.
3889   * @param string    $taxonomy Not used.
3890   */
3891  function update_term_cache( $terms, $taxonomy = '' ) {
3892      $data = array();
3893      foreach ( (array) $terms as $term ) {
3894          // Create a copy in case the array was passed by reference.
3895          $_term = clone $term;
3896  
3897          // Object ID should not be cached.
3898          unset( $_term->object_id );
3899  
3900          $data[ $term->term_id ] = $_term;
3901      }
3902      wp_cache_add_multiple( $data, 'terms' );
3903  }
3904  
3905  //
3906  // Private.
3907  //
3908  
3909  /**
3910   * Retrieves children of taxonomy as term IDs.
3911   *
3912   * @access private
3913   * @since 2.3.0
3914   *
3915   * @param string $taxonomy Taxonomy name.
3916   * @return array Empty if $taxonomy isn't hierarchical or returns children as term IDs.
3917   */
3918  function _get_term_hierarchy( $taxonomy ) {
3919      if ( ! is_taxonomy_hierarchical( $taxonomy ) ) {
3920          return array();
3921      }
3922      $children = get_option( "{$taxonomy}_children" );
3923  
3924      if ( is_array( $children ) ) {
3925          return $children;
3926      }
3927      $children = array();
3928      $terms    = get_terms(
3929          array(
3930              'taxonomy'               => $taxonomy,
3931              'get'                    => 'all',
3932              'orderby'                => 'id',
3933              'fields'                 => 'id=>parent',
3934              'update_term_meta_cache' => false,
3935          )
3936      );
3937      foreach ( $terms as $term_id => $parent ) {
3938          if ( $parent > 0 ) {
3939              $children[ $parent ][] = $term_id;
3940          }
3941      }
3942      update_option( "{$taxonomy}_children", $children );
3943  
3944      return $children;
3945  }
3946  
3947  /**
3948   * Gets the subset of $terms that are descendants of $term_id.
3949   *
3950   * If `$terms` is an array of objects, then _get_term_children() returns an array of objects.
3951   * If `$terms` is an array of IDs, then _get_term_children() returns an array of IDs.
3952   *
3953   * @access private
3954   * @since 2.3.0
3955   *
3956   * @param int    $term_id   The ancestor term: all returned terms should be descendants of `$term_id`.
3957   * @param array  $terms     The set of terms - either an array of term objects or term IDs - from which those that
3958   *                          are descendants of $term_id will be chosen.
3959   * @param string $taxonomy  The taxonomy which determines the hierarchy of the terms.
3960   * @param array  $ancestors Optional. Term ancestors that have already been identified. Passed by reference, to keep
3961   *                          track of found terms when recursing the hierarchy. The array of located ancestors is used
3962   *                          to prevent infinite recursion loops. For performance, `term_ids` are used as array keys,
3963   *                          with 1 as value. Default empty array.
3964   * @return array|WP_Error The subset of $terms that are descendants of $term_id.
3965   */
3966  function _get_term_children( $term_id, $terms, $taxonomy, &$ancestors = array() ) {
3967      $empty_array = array();
3968      if ( empty( $terms ) ) {
3969          return $empty_array;
3970      }
3971  
3972      $term_id      = (int) $term_id;
3973      $term_list    = array();
3974      $has_children = _get_term_hierarchy( $taxonomy );
3975  
3976      if ( $term_id && ! isset( $has_children[ $term_id ] ) ) {
3977          return $empty_array;
3978      }
3979  
3980      // Include the term itself in the ancestors array, so we can properly detect when a loop has occurred.
3981      if ( empty( $ancestors ) ) {
3982          $ancestors[ $term_id ] = 1;
3983      }
3984  
3985      foreach ( (array) $terms as $term ) {
3986          $use_id = false;
3987          if ( ! is_object( $term ) ) {
3988              $term = get_term( $term, $taxonomy );
3989              if ( is_wp_error( $term ) ) {
3990                  return $term;
3991              }
3992              $use_id = true;
3993          }
3994  
3995          // Don't recurse if we've already identified the term as a child - this indicates a loop.
3996          if ( isset( $ancestors[ $term->term_id ] ) ) {
3997              continue;
3998          }
3999  
4000          if ( (int) $term->parent === $term_id ) {
4001              if ( $use_id ) {
4002                  $term_list[] = $term->term_id;
4003              } else {
4004                  $term_list[] = $term;
4005              }
4006  
4007              if ( ! isset( $has_children[ $term->term_id ] ) ) {
4008                  continue;
4009              }
4010  
4011              $ancestors[ $term->term_id ] = 1;
4012  
4013              $children = _get_term_children( $term->term_id, $terms, $taxonomy, $ancestors );
4014              if ( $children ) {
4015                  $term_list = array_merge( $term_list, $children );
4016              }
4017          }
4018      }
4019  
4020      return $term_list;
4021  }
4022  
4023  /**
4024   * Adds count of children to parent count.
4025   *
4026   * Recalculates term counts by including items from child terms. Assumes all
4027   * relevant children are already in the $terms argument.
4028   *
4029   * @access private
4030   * @since 2.3.0
4031   *
4032   * @global wpdb $wpdb WordPress database abstraction object.
4033   *
4034   * @param object[]|WP_Term[] $terms    List of term objects (passed by reference).
4035   * @param string             $taxonomy Term context.
4036   */
4037  function _pad_term_counts( &$terms, $taxonomy ) {
4038      global $wpdb;
4039  
4040      // This function only works for hierarchical taxonomies like post categories.
4041      if ( ! is_taxonomy_hierarchical( $taxonomy ) ) {
4042          return;
4043      }
4044  
4045      $term_hier = _get_term_hierarchy( $taxonomy );
4046  
4047      if ( empty( $term_hier ) ) {
4048          return;
4049      }
4050  
4051      $term_items  = array();
4052      $terms_by_id = array();
4053      $term_ids    = array();
4054  
4055      foreach ( (array) $terms as $key => $term ) {
4056          $terms_by_id[ $term->term_id ]       = & $terms[ $key ];
4057          $term_ids[ $term->term_taxonomy_id ] = $term->term_id;
4058      }
4059  
4060      // Get the object and term IDs and stick them in a lookup table.
4061      $tax_obj      = get_taxonomy( $taxonomy );
4062      $object_types = esc_sql( $tax_obj->object_type );
4063      $results      = $wpdb->get_results( "SELECT object_id, term_taxonomy_id FROM $wpdb->term_relationships INNER JOIN $wpdb->posts ON object_id = ID WHERE term_taxonomy_id IN (" . implode( ',', array_keys( $term_ids ) ) . ") AND post_type IN ('" . implode( "', '", $object_types ) . "') AND post_status = 'publish'" );
4064  
4065      foreach ( $results as $row ) {
4066          $id = $term_ids[ $row->term_taxonomy_id ];
4067  
4068          $term_items[ $id ][ $row->object_id ] = isset( $term_items[ $id ][ $row->object_id ] ) ? ++$term_items[ $id ][ $row->object_id ] : 1;
4069      }
4070  
4071      // Touch every ancestor's lookup row for each post in each term.
4072      foreach ( $term_ids as $term_id ) {
4073          $child     = $term_id;
4074          $ancestors = array();
4075          while ( ! empty( $terms_by_id[ $child ] ) && $parent = $terms_by_id[ $child ]->parent ) {
4076              $ancestors[] = $child;
4077  
4078              if ( ! empty( $term_items[ $term_id ] ) ) {
4079                  foreach ( $term_items[ $term_id ] as $item_id => $touches ) {
4080                      $term_items[ $parent ][ $item_id ] = isset( $term_items[ $parent ][ $item_id ] ) ? ++$term_items[ $parent ][ $item_id ] : 1;
4081                  }
4082              }
4083  
4084              $child = $parent;
4085  
4086              if ( in_array( $parent, $ancestors, true ) ) {
4087                  break;
4088              }
4089          }
4090      }
4091  
4092      // Transfer the touched cells.
4093      foreach ( (array) $term_items as $id => $items ) {
4094          if ( isset( $terms_by_id[ $id ] ) ) {
4095              $terms_by_id[ $id ]->count = count( $items );
4096          }
4097      }
4098  }
4099  
4100  /**
4101   * Adds any terms from the given IDs to the cache that do not already exist in cache.
4102   *
4103   * @since 4.6.0
4104   * @since 6.1.0 This function is no longer marked as "private".
4105   * @since 6.3.0 Use wp_lazyload_term_meta() for lazy-loading of term meta.
4106   *
4107   * @global wpdb $wpdb WordPress database abstraction object.
4108   *
4109   * @param array $term_ids          Array of term IDs.
4110   * @param bool  $update_meta_cache Optional. Whether to update the meta cache. Default true.
4111   */
4112  function _prime_term_caches( $term_ids, $update_meta_cache = true ) {
4113      global $wpdb;
4114  
4115      $non_cached_ids = _get_non_cached_ids( $term_ids, 'terms' );
4116      if ( ! empty( $non_cached_ids ) ) {
4117          $fresh_terms = $wpdb->get_results( sprintf( "SELECT t.*, tt.* FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE t.term_id IN (%s)", implode( ',', array_map( 'intval', $non_cached_ids ) ) ) );
4118  
4119          update_term_cache( $fresh_terms );
4120      }
4121  
4122      if ( $update_meta_cache ) {
4123          wp_lazyload_term_meta( $term_ids );
4124      }
4125  }
4126  
4127  //
4128  // Default callbacks.
4129  //
4130  
4131  /**
4132   * Updates term count based on object types of the current taxonomy.
4133   *
4134   * Private function for the default callback for post_tag and category
4135   * taxonomies.
4136   *
4137   * @access private
4138   * @since 2.3.0
4139   *
4140   * @global wpdb $wpdb WordPress database abstraction object.
4141   *
4142   * @param int[]       $terms    List of term taxonomy IDs.
4143   * @param WP_Taxonomy $taxonomy Current taxonomy object of terms.
4144   */
4145  function _update_post_term_count( $terms, $taxonomy ) {
4146      global $wpdb;
4147  
4148      $object_types = (array) $taxonomy->object_type;
4149  
4150      foreach ( $object_types as &$object_type ) {
4151          list( $object_type ) = explode( ':', $object_type );
4152      }
4153  
4154      $object_types = array_unique( $object_types );
4155  
4156      $check_attachments = array_search( 'attachment', $object_types, true );
4157      if ( false !== $check_attachments ) {
4158          unset( $object_types[ $check_attachments ] );
4159          $check_attachments = true;
4160      }
4161  
4162      if ( $object_types ) {
4163          $object_types = esc_sql( array_filter( $object_types, 'post_type_exists' ) );
4164      }
4165  
4166      $post_statuses = array( 'publish' );
4167  
4168      /**
4169       * Filters the post statuses for updating the term count.
4170       *
4171       * @since 5.7.0
4172       *
4173       * @param string[]    $post_statuses List of post statuses to include in the count. Default is 'publish'.
4174       * @param WP_Taxonomy $taxonomy      Current taxonomy object.
4175       */
4176      $post_statuses = esc_sql( apply_filters( 'update_post_term_count_statuses', $post_statuses, $taxonomy ) );
4177  
4178      foreach ( (array) $terms as $term ) {
4179          $count = 0;
4180  
4181          // Attachments can be 'inherit' status, we need to base count off the parent's status if so.
4182          if ( $check_attachments ) {
4183              // phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.QuotedDynamicPlaceholderGeneration
4184              $count += (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_relationships, $wpdb->posts p1 WHERE p1.ID = $wpdb->term_relationships.object_id AND ( post_status IN ('" . implode( "', '", $post_statuses ) . "') OR ( post_status = 'inherit' AND post_parent > 0 AND ( SELECT post_status FROM $wpdb->posts WHERE ID = p1.post_parent ) IN ('" . implode( "', '", $post_statuses ) . "') ) ) AND post_type = 'attachment' AND term_taxonomy_id = %d", $term ) );
4185          }
4186  
4187          if ( $object_types ) {
4188              // phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.QuotedDynamicPlaceholderGeneration
4189              $count += (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_relationships, $wpdb->posts WHERE $wpdb->posts.ID = $wpdb->term_relationships.object_id AND post_status IN ('" . implode( "', '", $post_statuses ) . "') AND post_type IN ('" . implode( "', '", $object_types ) . "') AND term_taxonomy_id = %d", $term ) );
4190          }
4191  
4192          /** This action is documented in wp-includes/taxonomy.php */
4193          do_action( 'edit_term_taxonomy', $term, $taxonomy->name );
4194          $wpdb->update( $wpdb->term_taxonomy, compact( 'count' ), array( 'term_taxonomy_id' => $term ) );
4195  
4196          /** This action is documented in wp-includes/taxonomy.php */
4197          do_action( 'edited_term_taxonomy', $term, $taxonomy->name );
4198      }
4199  }
4200  
4201  /**
4202   * Updates term count based on number of objects.
4203   *
4204   * Default callback for the 'link_category' taxonomy.
4205   *
4206   * @since 3.3.0
4207   *
4208   * @global wpdb $wpdb WordPress database abstraction object.
4209   *
4210   * @param int[]       $terms    List of term taxonomy IDs.
4211   * @param WP_Taxonomy $taxonomy Current taxonomy object of terms.
4212   */
4213  function _update_generic_term_count( $terms, $taxonomy ) {
4214      global $wpdb;
4215  
4216      foreach ( (array) $terms as $term ) {
4217          $count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_relationships WHERE term_taxonomy_id = %d", $term ) );
4218  
4219          /** This action is documented in wp-includes/taxonomy.php */
4220          do_action( 'edit_term_taxonomy', $term, $taxonomy->name );
4221          $wpdb->update( $wpdb->term_taxonomy, compact( 'count' ), array( 'term_taxonomy_id' => $term ) );
4222  
4223          /** This action is documented in wp-includes/taxonomy.php */
4224          do_action( 'edited_term_taxonomy', $term, $taxonomy->name );
4225      }
4226  }
4227  
4228  /**
4229   * Creates a new term for a term_taxonomy item that currently shares its term
4230   * with another term_taxonomy.
4231   *
4232   * @ignore
4233   * @since 4.2.0
4234   * @since 4.3.0 Introduced `$record` parameter. Also, `$term_id` and
4235   *              `$term_taxonomy_id` can now accept objects.
4236   *
4237   * @global wpdb $wpdb WordPress database abstraction object.
4238   *
4239   * @param int|object $term_id          ID of the shared term, or the shared term object.
4240   * @param int|object $term_taxonomy_id ID of the term_taxonomy item to receive a new term, or the term_taxonomy object
4241   *                                     (corresponding to a row from the term_taxonomy table).
4242   * @param bool       $record           Whether to record data about the split term in the options table. The recording
4243   *                                     process has the potential to be resource-intensive, so during batch operations
4244   *                                     it can be beneficial to skip inline recording and do it just once, after the
4245   *                                     batch is processed. Only set this to `false` if you know what you are doing.
4246   *                                     Default: true.
4247   * @return int|WP_Error When the current term does not need to be split (or cannot be split on the current
4248   *                      database schema), `$term_id` is returned. When the term is successfully split, the
4249   *                      new term_id is returned. A WP_Error is returned for miscellaneous errors.
4250   */
4251  function _split_shared_term( $term_id, $term_taxonomy_id, $record = true ) {
4252      global $wpdb;
4253  
4254      if ( is_object( $term_id ) ) {
4255          $shared_term = $term_id;
4256          $term_id     = (int) $shared_term->term_id;
4257      }
4258  
4259      if ( is_object( $term_taxonomy_id ) ) {
4260          $term_taxonomy    = $term_taxonomy_id;
4261          $term_taxonomy_id = (int) $term_taxonomy->term_taxonomy_id;
4262      }
4263  
4264      // If there are no shared term_taxonomy rows, there's nothing to do here.
4265      $shared_tt_count = (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_taxonomy tt WHERE tt.term_id = %d AND tt.term_taxonomy_id != %d", $term_id, $term_taxonomy_id ) );
4266  
4267      if ( ! $shared_tt_count ) {
4268          return $term_id;
4269      }
4270  
4271      /*
4272       * Verify that the term_taxonomy_id passed to the function is actually associated with the term_id.
4273       * If there's a mismatch, it may mean that the term is already split. Return the actual term_id from the db.
4274       */
4275      $check_term_id = (int) $wpdb->get_var( $wpdb->prepare( "SELECT term_id FROM $wpdb->term_taxonomy WHERE term_taxonomy_id = %d", $term_taxonomy_id ) );
4276      if ( $check_term_id !== $term_id ) {
4277          return $check_term_id;
4278      }
4279  
4280      // Pull up data about the currently shared slug, which we'll use to populate the new one.
4281      if ( empty( $shared_term ) ) {
4282          $shared_term = $wpdb->get_row( $wpdb->prepare( "SELECT t.* FROM $wpdb->terms t WHERE t.term_id = %d", $term_id ) );
4283      }
4284  
4285      $new_term_data = array(
4286          'name'       => $shared_term->name,
4287          'slug'       => $shared_term->slug,
4288          'term_group' => $shared_term->term_group,
4289      );
4290  
4291      if ( false === $wpdb->insert( $wpdb->terms, $new_term_data ) ) {
4292          return new WP_Error( 'db_insert_error', __( 'Could not split shared term.' ), $wpdb->last_error );
4293      }
4294  
4295      $new_term_id = (int) $wpdb->insert_id;
4296  
4297      // Update the existing term_taxonomy to point to the newly created term.
4298      $wpdb->update(
4299          $wpdb->term_taxonomy,
4300          array( 'term_id' => $new_term_id ),
4301          array( 'term_taxonomy_id' => $term_taxonomy_id )
4302      );
4303  
4304      // Reassign child terms to the new parent.
4305      if ( empty( $term_taxonomy ) ) {
4306          $term_taxonomy = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->term_taxonomy WHERE term_taxonomy_id = %d", $term_taxonomy_id ) );
4307      }
4308  
4309      $children_tt_ids = $wpdb->get_col( $wpdb->prepare( "SELECT term_taxonomy_id FROM $wpdb->term_taxonomy WHERE parent = %d AND taxonomy = %s", $term_id, $term_taxonomy->taxonomy ) );
4310      if ( ! empty( $children_tt_ids ) ) {
4311          foreach ( $children_tt_ids as $child_tt_id ) {
4312              $wpdb->update(
4313                  $wpdb->term_taxonomy,
4314                  array( 'parent' => $new_term_id ),
4315                  array( 'term_taxonomy_id' => $child_tt_id )
4316              );
4317              clean_term_cache( (int) $child_tt_id, '', false );
4318          }
4319      } else {
4320          // If the term has no children, we must force its taxonomy cache to be rebuilt separately.
4321          clean_term_cache( $new_term_id, $term_taxonomy->taxonomy, false );
4322      }
4323  
4324      clean_term_cache( $term_id, $term_taxonomy->taxonomy, false );
4325  
4326      /*
4327       * Taxonomy cache clearing is delayed to avoid race conditions that may occur when
4328       * regenerating the taxonomy's hierarchy tree.
4329       */
4330      $taxonomies_to_clean = array( $term_taxonomy->taxonomy );
4331  
4332      // Clean the cache for term taxonomies formerly shared with the current term.
4333      $shared_term_taxonomies = $wpdb->get_col( $wpdb->prepare( "SELECT taxonomy FROM $wpdb->term_taxonomy WHERE term_id = %d", $term_id ) );
4334      $taxonomies_to_clean    = array_merge( $taxonomies_to_clean, $shared_term_taxonomies );
4335  
4336      foreach ( $taxonomies_to_clean as $taxonomy_to_clean ) {
4337          clean_taxonomy_cache( $taxonomy_to_clean );
4338      }
4339  
4340      // Keep a record of term_ids that have been split, keyed by old term_id. See wp_get_split_term().
4341      if ( $record ) {
4342          $split_term_data = get_option( '_split_terms', array() );
4343          if ( ! isset( $split_term_data[ $term_id ] ) ) {
4344              $split_term_data[ $term_id ] = array();
4345          }
4346  
4347          $split_term_data[ $term_id ][ $term_taxonomy->taxonomy ] = $new_term_id;
4348          update_option( '_split_terms', $split_term_data );
4349      }
4350  
4351      // If we've just split the final shared term, set the "finished" flag.
4352      $shared_terms_exist = $wpdb->get_results(
4353          "SELECT tt.term_id, t.*, count(*) as term_tt_count FROM {$wpdb->term_taxonomy} tt
4354           LEFT JOIN {$wpdb->terms} t ON t.term_id = tt.term_id
4355           GROUP BY t.term_id
4356           HAVING term_tt_count > 1
4357           LIMIT 1"
4358      );
4359      if ( ! $shared_terms_exist ) {
4360          update_option( 'finished_splitting_shared_terms', true );
4361      }
4362  
4363      /**
4364       * Fires after a previously shared taxonomy term is split into two separate terms.
4365       *
4366       * @since 4.2.0
4367       *
4368       * @param int    $term_id          ID of the formerly shared term.
4369       * @param int    $new_term_id      ID of the new term created for the $term_taxonomy_id.
4370       * @param int    $term_taxonomy_id ID for the term_taxonomy row affected by the split.
4371       * @param string $taxonomy         Taxonomy for the split term.
4372       */
4373      do_action( 'split_shared_term', $term_id, $new_term_id, $term_taxonomy_id, $term_taxonomy->taxonomy );
4374  
4375      return $new_term_id;
4376  }
4377  
4378  /**
4379   * Splits a batch of shared taxonomy terms.
4380   *
4381   * @since 4.3.0
4382   *
4383   * @global wpdb $wpdb WordPress database abstraction object.
4384   */
4385  function _wp_batch_split_terms() {
4386      global $wpdb;
4387  
4388      $lock_name = 'term_split.lock';
4389  
4390      // Try to lock.
4391      $lock_result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'off') /* LOCK */", $lock_name, time() ) );
4392  
4393      if ( ! $lock_result ) {
4394          $lock_result = get_option( $lock_name );
4395  
4396          // Bail if we were unable to create a lock, or if the existing lock is still valid.
4397          if ( ! $lock_result || ( $lock_result > ( time() - HOUR_IN_SECONDS ) ) ) {
4398              wp_schedule_single_event( time() + ( 5 * MINUTE_IN_SECONDS ), 'wp_split_shared_term_batch' );
4399              return;
4400          }
4401      }
4402  
4403      // Update the lock, as by this point we've definitely got a lock, just need to fire the actions.
4404      update_option( $lock_name, time() );
4405  
4406      // Get a list of shared terms (those with more than one associated row in term_taxonomy).
4407      $shared_terms = $wpdb->get_results(
4408          "SELECT tt.term_id, t.*, count(*) as term_tt_count FROM {$wpdb->term_taxonomy} tt
4409           LEFT JOIN {$wpdb->terms} t ON t.term_id = tt.term_id
4410           GROUP BY t.term_id
4411           HAVING term_tt_count > 1
4412           LIMIT 10"
4413      );
4414  
4415      // No more terms, we're done here.
4416      if ( ! $shared_terms ) {
4417          update_option( 'finished_splitting_shared_terms', true );
4418          delete_option( $lock_name );
4419          return;
4420      }
4421  
4422      // Shared terms found? We'll need to run this script again.
4423      wp_schedule_single_event( time() + ( 2 * MINUTE_IN_SECONDS ), 'wp_split_shared_term_batch' );
4424  
4425      // Rekey shared term array for faster lookups.
4426      $_shared_terms = array();
4427      foreach ( $shared_terms as $shared_term ) {
4428          $term_id                   = (int) $shared_term->term_id;
4429          $_shared_terms[ $term_id ] = $shared_term;
4430      }
4431      $shared_terms = $_shared_terms;
4432  
4433      // Get term taxonomy data for all shared terms.
4434      $shared_term_ids = implode( ',', array_keys( $shared_terms ) );
4435      $shared_tts      = $wpdb->get_results( "SELECT * FROM {$wpdb->term_taxonomy} WHERE `term_id` IN ({$shared_term_ids})" );
4436  
4437      // Split term data recording is slow, so we do it just once, outside the loop.
4438      $split_term_data    = get_option( '_split_terms', array() );
4439      $skipped_first_term = array();
4440      $taxonomies         = array();
4441      foreach ( $shared_tts as $shared_tt ) {
4442          $term_id = (int) $shared_tt->term_id;
4443  
4444          // Don't split the first tt belonging to a given term_id.
4445          if ( ! isset( $skipped_first_term[ $term_id ] ) ) {
4446              $skipped_first_term[ $term_id ] = 1;
4447              continue;
4448          }
4449  
4450          if ( ! isset( $split_term_data[ $term_id ] ) ) {
4451              $split_term_data[ $term_id ] = array();
4452          }
4453  
4454          // Keep track of taxonomies whose hierarchies need flushing.
4455          if ( ! isset( $taxonomies[ $shared_tt->taxonomy ] ) ) {
4456              $taxonomies[ $shared_tt->taxonomy ] = 1;
4457          }
4458  
4459          // Split the term.
4460          $split_term_data[ $term_id ][ $shared_tt->taxonomy ] = _split_shared_term( $shared_terms[ $term_id ], $shared_tt, false );
4461      }
4462  
4463      // Rebuild the cached hierarchy for each affected taxonomy.
4464      foreach ( array_keys( $taxonomies ) as $tax ) {
4465          delete_option( "{$tax}_children" );
4466          _get_term_hierarchy( $tax );
4467      }
4468  
4469      update_option( '_split_terms', $split_term_data );
4470  
4471      delete_option( $lock_name );
4472  }
4473  
4474  /**
4475   * In order to avoid the _wp_batch_split_terms() job being accidentally removed,
4476   * checks that it's still scheduled while we haven't finished splitting terms.
4477   *
4478   * @ignore
4479   * @since 4.3.0
4480   */
4481  function _wp_check_for_scheduled_split_terms() {
4482      if ( ! get_option( 'finished_splitting_shared_terms' ) && ! wp_next_scheduled( 'wp_split_shared_term_batch' ) ) {
4483          wp_schedule_single_event( time() + MINUTE_IN_SECONDS, 'wp_split_shared_term_batch' );
4484      }
4485  }
4486  
4487  /**
4488   * Checks default categories when a term gets split to see if any of them need to be updated.
4489   *
4490   * @ignore
4491   * @since 4.2.0
4492   *
4493   * @param int    $term_id          ID of the formerly shared term.
4494   * @param int    $new_term_id      ID of the new term created for the $term_taxonomy_id.
4495   * @param int    $term_taxonomy_id ID for the term_taxonomy row affected by the split.
4496   * @param string $taxonomy         Taxonomy for the split term.
4497   */
4498  function _wp_check_split_default_terms( $term_id, $new_term_id, $term_taxonomy_id, $taxonomy ) {
4499      if ( 'category' !== $taxonomy ) {
4500          return;
4501      }
4502  
4503      foreach ( array( 'default_category', 'default_link_category', 'default_email_category' ) as $option ) {
4504          if ( (int) get_option( $option, -1 ) === $term_id ) {
4505              update_option( $option, $new_term_id );
4506          }
4507      }
4508  }
4509  
4510  /**
4511   * Checks menu items when a term gets split to see if any of them need to be updated.
4512   *
4513   * @ignore
4514   * @since 4.2.0
4515   *
4516   * @global wpdb $wpdb WordPress database abstraction object.
4517   *
4518   * @param int    $term_id          ID of the formerly shared term.
4519   * @param int    $new_term_id      ID of the new term created for the $term_taxonomy_id.
4520   * @param int    $term_taxonomy_id ID for the term_taxonomy row affected by the split.
4521   * @param string $taxonomy         Taxonomy for the split term.
4522   */
4523  function _wp_check_split_terms_in_menus( $term_id, $new_term_id, $term_taxonomy_id, $taxonomy ) {
4524      global $wpdb;
4525      $post_ids = $wpdb->get_col(
4526          $wpdb->prepare(
4527              "SELECT m1.post_id
4528          FROM {$wpdb->postmeta} AS m1
4529              INNER JOIN {$wpdb->postmeta} AS m2 ON ( m2.post_id = m1.post_id )
4530              INNER JOIN {$wpdb->postmeta} AS m3 ON ( m3.post_id = m1.post_id )
4531          WHERE ( m1.meta_key = '_menu_item_type' AND m1.meta_value = 'taxonomy' )
4532              AND ( m2.meta_key = '_menu_item_object' AND m2.meta_value = %s )
4533              AND ( m3.meta_key = '_menu_item_object_id' AND m3.meta_value = %d )",
4534              $taxonomy,
4535              $term_id
4536          )
4537      );
4538  
4539      if ( $post_ids ) {
4540          foreach ( $post_ids as $post_id ) {
4541              update_post_meta( $post_id, '_menu_item_object_id', $new_term_id, $term_id );
4542          }
4543      }
4544  }
4545  
4546  /**
4547   * If the term being split is a nav_menu, changes associations.
4548   *
4549   * @ignore
4550   * @since 4.3.0
4551   *
4552   * @param int    $term_id          ID of the formerly shared term.
4553   * @param int    $new_term_id      ID of the new term created for the $term_taxonomy_id.
4554   * @param int    $term_taxonomy_id ID for the term_taxonomy row affected by the split.
4555   * @param string $taxonomy         Taxonomy for the split term.
4556   */
4557  function _wp_check_split_nav_menu_terms( $term_id, $new_term_id, $term_taxonomy_id, $taxonomy ) {
4558      if ( 'nav_menu' !== $taxonomy ) {
4559          return;
4560      }
4561  
4562      // Update menu locations.
4563      $locations = get_nav_menu_locations();
4564      foreach ( $locations as $location => $menu_id ) {
4565          if ( $term_id === $menu_id ) {
4566              $locations[ $location ] = $new_term_id;
4567          }
4568      }
4569      set_theme_mod( 'nav_menu_locations', $locations );
4570  }
4571  
4572  /**
4573   * Gets data about terms that previously shared a single term_id, but have since been split.
4574   *
4575   * @since 4.2.0
4576   *
4577   * @param int $old_term_id Term ID. This is the old, pre-split term ID.
4578   * @return array Array of new term IDs, keyed by taxonomy.
4579   */
4580  function wp_get_split_terms( $old_term_id ) {
4581      $split_terms = get_option( '_split_terms', array() );
4582  
4583      $terms = array();
4584      if ( isset( $split_terms[ $old_term_id ] ) ) {
4585          $terms = $split_terms[ $old_term_id ];
4586      }
4587  
4588      return $terms;
4589  }
4590  
4591  /**
4592   * Gets the new term ID corresponding to a previously split term.
4593   *
4594   * @since 4.2.0
4595   *
4596   * @param int    $old_term_id Term ID. This is the old, pre-split term ID.
4597   * @param string $taxonomy    Taxonomy that the term belongs to.
4598   * @return int|false If a previously split term is found corresponding to the old term_id and taxonomy,
4599   *                   the new term_id will be returned. If no previously split term is found matching
4600   *                   the parameters, returns false.
4601   */
4602  function wp_get_split_term( $old_term_id, $taxonomy ) {
4603      $split_terms = wp_get_split_terms( $old_term_id );
4604  
4605      $term_id = false;
4606      if ( isset( $split_terms[ $taxonomy ] ) ) {
4607          $term_id = (int) $split_terms[ $taxonomy ];
4608      }
4609  
4610      return $term_id;
4611  }
4612  
4613  /**
4614   * Determines whether a term is shared between multiple taxonomies.
4615   *
4616   * Shared taxonomy terms began to be split in 4.3, but failed cron tasks or
4617   * other delays in upgrade routines may cause shared terms to remain.
4618   *
4619   * @since 4.4.0
4620   *
4621   * @global wpdb $wpdb WordPress database abstraction object.
4622   *
4623   * @param int $term_id Term ID.
4624   * @return bool Returns false if a term is not shared between multiple taxonomies or
4625   *              if splitting shared taxonomy terms is finished.
4626   */
4627  function wp_term_is_shared( $term_id ) {
4628      global $wpdb;
4629  
4630      if ( get_option( 'finished_splitting_shared_terms' ) ) {
4631          return false;
4632      }
4633  
4634      $tt_count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_taxonomy WHERE term_id = %d", $term_id ) );
4635  
4636      return $tt_count > 1;
4637  }
4638  
4639  /**
4640   * Generates a permalink for a taxonomy term archive.
4641   *
4642   * @since 2.5.0
4643   *
4644   * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
4645   *
4646   * @param WP_Term|int|string $term     The term object, ID, or slug whose link will be retrieved.
4647   * @param string             $taxonomy Optional. Taxonomy. Default empty.
4648   * @return string|WP_Error URL of the taxonomy term archive on success, WP_Error if term does not exist.
4649   */
4650  function get_term_link( $term, $taxonomy = '' ) {
4651      global $wp_rewrite;
4652  
4653      if ( ! is_object( $term ) ) {
4654          if ( is_int( $term ) ) {
4655              $term = get_term( $term, $taxonomy );
4656          } else {
4657              $term = get_term_by( 'slug', $term, $taxonomy );
4658          }
4659      }
4660  
4661      if ( ! is_object( $term ) ) {
4662          $term = new WP_Error( 'invalid_term', __( 'Empty Term.' ) );
4663      }
4664  
4665      if ( is_wp_error( $term ) ) {
4666          return $term;
4667      }
4668  
4669      $taxonomy = $term->taxonomy;
4670  
4671      $termlink = $wp_rewrite->get_extra_permastruct( $taxonomy );
4672  
4673      /**
4674       * Filters the permalink structure for a term before token replacement occurs.
4675       *
4676       * @since 4.9.0
4677       *
4678       * @param string  $termlink The permalink structure for the term's taxonomy.
4679       * @param WP_Term $term     The term object.
4680       */
4681      $termlink = apply_filters( 'pre_term_link', $termlink, $term );
4682  
4683      $slug = $term->slug;
4684      $t    = get_taxonomy( $taxonomy );
4685  
4686      if ( empty( $termlink ) ) {
4687          if ( 'category' === $taxonomy ) {
4688              $termlink = '?cat=' . $term->term_id;
4689          } elseif ( $t->query_var ) {
4690              $termlink = "?$t->query_var=$slug";
4691          } else {
4692              $termlink = "?taxonomy=$taxonomy&term=$slug";
4693          }
4694          $termlink = home_url( $termlink );
4695      } else {
4696          if ( ! empty( $t->rewrite['hierarchical'] ) ) {
4697              $hierarchical_slugs = array();
4698              $ancestors          = get_ancestors( $term->term_id, $taxonomy, 'taxonomy' );
4699              foreach ( (array) $ancestors as $ancestor ) {
4700                  $ancestor_term        = get_term( $ancestor, $taxonomy );
4701                  $hierarchical_slugs[] = $ancestor_term->slug;
4702              }
4703              $hierarchical_slugs   = array_reverse( $hierarchical_slugs );
4704              $hierarchical_slugs[] = $slug;
4705              $termlink             = str_replace( "%$taxonomy%", implode( '/', $hierarchical_slugs ), $termlink );
4706          } else {
4707              $termlink = str_replace( "%$taxonomy%", $slug, $termlink );
4708          }
4709          $termlink = home_url( user_trailingslashit( $termlink, 'category' ) );
4710      }
4711  
4712      // Back compat filters.
4713      if ( 'post_tag' === $taxonomy ) {
4714  
4715          /**
4716           * Filters the tag link.
4717           *
4718           * @since 2.3.0
4719           * @since 2.5.0 Deprecated in favor of {@see 'term_link'} filter.
4720           * @since 5.4.1 Restored (un-deprecated).
4721           *
4722           * @param string $termlink Tag link URL.
4723           * @param int    $term_id  Term ID.
4724           */
4725          $termlink = apply_filters( 'tag_link', $termlink, $term->term_id );
4726      } elseif ( 'category' === $taxonomy ) {
4727  
4728          /**
4729           * Filters the category link.
4730           *
4731           * @since 1.5.0
4732           * @since 2.5.0 Deprecated in favor of {@see 'term_link'} filter.
4733           * @since 5.4.1 Restored (un-deprecated).
4734           *
4735           * @param string $termlink Category link URL.
4736           * @param int    $term_id  Term ID.
4737           */
4738          $termlink = apply_filters( 'category_link', $termlink, $term->term_id );
4739      }
4740  
4741      /**
4742       * Filters the term link.
4743       *
4744       * @since 2.5.0
4745       *
4746       * @param string  $termlink Term link URL.
4747       * @param WP_Term $term     Term object.
4748       * @param string  $taxonomy Taxonomy slug.
4749       */
4750      return apply_filters( 'term_link', $termlink, $term, $taxonomy );
4751  }
4752  
4753  /**
4754   * Displays the taxonomies of a post with available options.
4755   *
4756   * This function can be used within the loop to display the taxonomies for a
4757   * post without specifying the Post ID. You can also use it outside the Loop to
4758   * display the taxonomies for a specific post.
4759   *
4760   * @since 2.5.0
4761   *
4762   * @param array $args {
4763   *     Arguments about which post to use and how to format the output. Shares all of the arguments
4764   *     supported by get_the_taxonomies(), in addition to the following.
4765   *
4766   *     @type int|WP_Post $post   Post ID or object to get taxonomies of. Default current post.
4767   *     @type string      $before Displays before the taxonomies. Default empty string.
4768   *     @type string      $sep    Separates each taxonomy. Default is a space.
4769   *     @type string      $after  Displays after the taxonomies. Default empty string.
4770   * }
4771   */
4772  function the_taxonomies( $args = array() ) {
4773      $defaults = array(
4774          'post'   => 0,
4775          'before' => '',
4776          'sep'    => ' ',
4777          'after'  => '',
4778      );
4779  
4780      $parsed_args = wp_parse_args( $args, $defaults );
4781  
4782      echo $parsed_args['before'] . implode( $parsed_args['sep'], get_the_taxonomies( $parsed_args['post'], $parsed_args ) ) . $parsed_args['after'];
4783  }
4784  
4785  /**
4786   * Retrieves all taxonomies associated with a post.
4787   *
4788   * This function can be used within the loop. It will also return an array of
4789   * the taxonomies with links to the taxonomy and name.
4790   *
4791   * @since 2.5.0
4792   *
4793   * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
4794   * @param array       $args {
4795   *           Optional. Arguments about how to format the list of taxonomies. Default empty array.
4796   *
4797   *     @type string $template      Template for displaying a taxonomy label and list of terms.
4798   *                                 Default is "Label: Terms."
4799   *     @type string $term_template Template for displaying a single term in the list. Default is the term name
4800   *                                 linked to its archive.
4801   * }
4802   * @return string[] List of taxonomies.
4803   */
4804  function get_the_taxonomies( $post = 0, $args = array() ) {
4805      $post = get_post( $post );
4806  
4807      $args = wp_parse_args(
4808          $args,
4809          array(
4810              /* translators: %s: Taxonomy label, %l: List of terms formatted as per $term_template. */
4811              'template'      => __( '%s: %l.' ),
4812              'term_template' => '<a href="%1$s">%2$s</a>',
4813          )
4814      );
4815  
4816      $taxonomies = array();
4817  
4818      if ( ! $post ) {
4819          return $taxonomies;
4820      }
4821  
4822      foreach ( get_object_taxonomies( $post ) as $taxonomy ) {
4823          $t = (array) get_taxonomy( $taxonomy );
4824          if ( empty( $t['label'] ) ) {
4825              $t['label'] = $taxonomy;
4826          }
4827          if ( empty( $t['args'] ) ) {
4828              $t['args'] = array();
4829          }
4830          if ( empty( $t['template'] ) ) {
4831              $t['template'] = $args['template'];
4832          }
4833          if ( empty( $t['term_template'] ) ) {
4834              $t['term_template'] = $args['term_template'];
4835          }
4836  
4837          $terms = get_object_term_cache( $post->ID, $taxonomy );
4838          if ( false === $terms ) {
4839              $terms = wp_get_object_terms( $post->ID, $taxonomy, $t['args'] );
4840          }
4841          $links = array();
4842  
4843          foreach ( $terms as $term ) {
4844              $links[] = wp_sprintf( $t['term_template'], esc_attr( get_term_link( $term ) ), $term->name );
4845          }
4846          if ( $links ) {
4847              $taxonomies[ $taxonomy ] = wp_sprintf( $t['template'], $t['label'], $links, $terms );
4848          }
4849      }
4850      return $taxonomies;
4851  }
4852  
4853  /**
4854   * Retrieves all taxonomy names for the given post.
4855   *
4856   * @since 2.5.0
4857   *
4858   * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
4859   * @return string[] An array of all taxonomy names for the given post.
4860   */
4861  function get_post_taxonomies( $post = 0 ) {
4862      $post = get_post( $post );
4863  
4864      return get_object_taxonomies( $post );
4865  }
4866  
4867  /**
4868   * Determines if the given object is associated with any of the given terms.
4869   *
4870   * The given terms are checked against the object's terms' term_ids, names and slugs.
4871   * Terms given as integers will only be checked against the object's terms' term_ids.
4872   * If no terms are given, determines if object is associated with any terms in the given taxonomy.
4873   *
4874   * @since 2.7.0
4875   *
4876   * @param int                       $object_id ID of the object (post ID, link ID, ...).
4877   * @param string                    $taxonomy  Single taxonomy name.
4878   * @param int|string|int[]|string[] $terms     Optional. Term ID, name, slug, or array of such
4879   *                                             to check against. Default null.
4880   * @return bool|WP_Error WP_Error on input error.
4881   */
4882  function is_object_in_term( $object_id, $taxonomy, $terms = null ) {
4883      $object_id = (int) $object_id;
4884      if ( ! $object_id ) {
4885          return new WP_Error( 'invalid_object', __( 'Invalid object ID.' ) );
4886      }
4887  
4888      $object_terms = get_object_term_cache( $object_id, $taxonomy );
4889      if ( false === $object_terms ) {
4890          $object_terms = wp_get_object_terms( $object_id, $taxonomy, array( 'update_term_meta_cache' => false ) );
4891          if ( is_wp_error( $object_terms ) ) {
4892              return $object_terms;
4893          }
4894  
4895          wp_cache_set( $object_id, wp_list_pluck( $object_terms, 'term_id' ), "{$taxonomy}_relationships" );
4896      }
4897  
4898      if ( is_wp_error( $object_terms ) ) {
4899          return $object_terms;
4900      }
4901  
4902      if ( empty( $object_terms ) ) {
4903          return false;
4904      }
4905  
4906      if ( empty( $terms ) ) {
4907          return true;
4908      }
4909  
4910      $terms = (array) $terms;
4911  
4912      $ints = array_filter( $terms, 'is_int' );
4913      if ( $ints ) {
4914          $strs = array_diff( $terms, $ints );
4915      } else {
4916          $strs =& $terms;
4917      }
4918  
4919      foreach ( $object_terms as $object_term ) {
4920          // If term is an int, check against term_ids only.
4921          if ( $ints && in_array( $object_term->term_id, $ints, true ) ) {
4922              return true;
4923          }
4924  
4925          if ( $strs ) {
4926              // Only check numeric strings against term_id, to avoid false matches due to type juggling.
4927              $numeric_strs = array_map( 'intval', array_filter( $strs, 'is_numeric' ) );
4928              if ( in_array( $object_term->term_id, $numeric_strs, true ) ) {
4929                  return true;
4930              }
4931  
4932              if ( in_array( $object_term->name, $strs, true ) ) {
4933                  return true;
4934              }
4935              if ( in_array( $object_term->slug, $strs, true ) ) {
4936                  return true;
4937              }
4938          }
4939      }
4940  
4941      return false;
4942  }
4943  
4944  /**
4945   * Determines if the given object type is associated with the given taxonomy.
4946   *
4947   * @since 3.0.0
4948   *
4949   * @param string $object_type Object type string.
4950   * @param string $taxonomy    Single taxonomy name.
4951   * @return bool True if object is associated with the taxonomy, otherwise false.
4952   */
4953  function is_object_in_taxonomy( $object_type, $taxonomy ) {
4954      $taxonomies = get_object_taxonomies( $object_type );
4955      if ( empty( $taxonomies ) ) {
4956          return false;
4957      }
4958      return in_array( $taxonomy, $taxonomies, true );
4959  }
4960  
4961  /**
4962   * Gets an array of ancestor IDs for a given object.
4963   *
4964   * @since 3.1.0
4965   * @since 4.1.0 Introduced the `$resource_type` argument.
4966   *
4967   * @param int    $object_id     Optional. The ID of the object. Default 0.
4968   * @param string $object_type   Optional. The type of object for which we'll be retrieving
4969   *                              ancestors. Accepts a post type or a taxonomy name. Default empty.
4970   * @param string $resource_type Optional. Type of resource $object_type is. Accepts 'post_type'
4971   *                              or 'taxonomy'. Default empty.
4972   * @return int[] An array of IDs of ancestors from lowest to highest in the hierarchy.
4973   */
4974  function get_ancestors( $object_id = 0, $object_type = '', $resource_type = '' ) {
4975      $object_id = (int) $object_id;
4976  
4977      $ancestors = array();
4978  
4979      if ( empty( $object_id ) ) {
4980  
4981          /** This filter is documented in wp-includes/taxonomy.php */
4982          return apply_filters( 'get_ancestors', $ancestors, $object_id, $object_type, $resource_type );
4983      }
4984  
4985      if ( ! $resource_type ) {
4986          if ( is_taxonomy_hierarchical( $object_type ) ) {
4987              $resource_type = 'taxonomy';
4988          } elseif ( post_type_exists( $object_type ) ) {
4989              $resource_type = 'post_type';
4990          }
4991      }
4992  
4993      if ( 'taxonomy' === $resource_type ) {
4994          $term = get_term( $object_id, $object_type );
4995          while ( ! is_wp_error( $term ) && ! empty( $term->parent ) && ! in_array( $term->parent, $ancestors, true ) ) {
4996              $ancestors[] = (int) $term->parent;
4997              $term        = get_term( $term->parent, $object_type );
4998          }
4999      } elseif ( 'post_type' === $resource_type ) {
5000          $ancestors = get_post_ancestors( $object_id );
5001      }
5002  
5003      /**
5004       * Filters a given object's ancestors.
5005       *
5006       * @since 3.1.0
5007       * @since 4.1.1 Introduced the `$resource_type` parameter.
5008       *
5009       * @param int[]  $ancestors     An array of IDs of object ancestors.
5010       * @param int    $object_id     Object ID.
5011       * @param string $object_type   Type of object.
5012       * @param string $resource_type Type of resource $object_type is.
5013       */
5014      return apply_filters( 'get_ancestors', $ancestors, $object_id, $object_type, $resource_type );
5015  }
5016  
5017  /**
5018   * Returns the term's parent's term ID.
5019   *
5020   * @since 3.1.0
5021   *
5022   * @param int    $term_id  Term ID.
5023   * @param string $taxonomy Taxonomy name.
5024   * @return int|false Parent term ID on success, false on failure.
5025   */
5026  function wp_get_term_taxonomy_parent_id( $term_id, $taxonomy ) {
5027      $term = get_term( $term_id, $taxonomy );
5028      if ( ! $term || is_wp_error( $term ) ) {
5029          return false;
5030      }
5031      return (int) $term->parent;
5032  }
5033  
5034  /**
5035   * Checks the given subset of the term hierarchy for hierarchy loops.
5036   * Prevents loops from forming and breaks those that it finds.
5037   *
5038   * Attached to the {@see 'wp_update_term_parent'} filter.
5039   *
5040   * @since 3.1.0
5041   *
5042   * @param int    $parent_term `term_id` of the parent for the term we're checking.
5043   * @param int    $term_id     The term we're checking.
5044   * @param string $taxonomy    The taxonomy of the term we're checking.
5045   * @return int The new parent for the term.
5046   */
5047  function wp_check_term_hierarchy_for_loops( $parent_term, $term_id, $taxonomy ) {
5048      // Nothing fancy here - bail.
5049      if ( ! $parent_term ) {
5050          return 0;
5051      }
5052  
5053      // Can't be its own parent.
5054      if ( $parent_term === $term_id ) {
5055          return 0;
5056      }
5057  
5058      // Now look for larger loops.
5059      $loop = wp_find_hierarchy_loop( 'wp_get_term_taxonomy_parent_id', $term_id, $parent_term, array( $taxonomy ) );
5060      if ( ! $loop ) {
5061          return $parent_term; // No loop.
5062      }
5063  
5064      // Setting $parent_term to the given value causes a loop.
5065      if ( isset( $loop[ $term_id ] ) ) {
5066          return 0;
5067      }
5068  
5069      // There's a loop, but it doesn't contain $term_id. Break the loop.
5070      foreach ( array_keys( $loop ) as $loop_member ) {
5071          wp_update_term( $loop_member, $taxonomy, array( 'parent' => 0 ) );
5072      }
5073  
5074      return $parent_term;
5075  }
5076  
5077  /**
5078   * Determines whether a taxonomy is considered "viewable".
5079   *
5080   * @since 5.1.0
5081   *
5082   * @param string|WP_Taxonomy $taxonomy Taxonomy name or object.
5083   * @return bool Whether the taxonomy should be considered viewable.
5084   */
5085  function is_taxonomy_viewable( $taxonomy ) {
5086      if ( is_scalar( $taxonomy ) ) {
5087          $taxonomy = get_taxonomy( $taxonomy );
5088          if ( ! $taxonomy ) {
5089              return false;
5090          }
5091      }
5092  
5093      return $taxonomy->publicly_queryable;
5094  }
5095  
5096  /**
5097   * Determines whether a term is publicly viewable.
5098   *
5099   * A term is considered publicly viewable if its taxonomy is viewable.
5100   *
5101   * @since 6.1.0
5102   *
5103   * @param int|WP_Term $term Term ID or term object.
5104   * @return bool Whether the term is publicly viewable.
5105   */
5106  function is_term_publicly_viewable( $term ) {
5107      $term = get_term( $term );
5108  
5109      if ( ! $term ) {
5110          return false;
5111      }
5112  
5113      return is_taxonomy_viewable( $term->taxonomy );
5114  }
5115  
5116  /**
5117   * Sets the last changed time for the 'terms' cache group.
5118   *
5119   * @since 5.0.0
5120   */
5121  function wp_cache_set_terms_last_changed() {
5122      wp_cache_set_last_changed( 'terms' );
5123  }
5124  
5125  /**
5126   * Aborts calls to term meta if it is not supported.
5127   *
5128   * @since 5.0.0
5129   *
5130   * @param mixed $check Skip-value for whether to proceed term meta function execution.
5131   * @return mixed Original value of $check, or false if term meta is not supported.
5132   */
5133  function wp_check_term_meta_support_prefilter( $check ) {
5134      if ( get_option( 'db_version' ) < 34370 ) {
5135          return false;
5136      }
5137  
5138      return $check;
5139  }


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