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1 <?php 2 /** 3 * Taxonomy API: Core category-specific template tags 4 * 5 * @package WordPress 6 * @subpackage Template 7 * @since 1.2.0 8 */ 9 10 /** 11 * Retrieves category link URL. 12 * 13 * @since 1.0.0 14 * 15 * @see get_term_link() 16 * 17 * @param int|object $category Category ID or object. 18 * @return string Link on success, empty string if category does not exist. 19 */ 20 function get_category_link( $category ) { 21 if ( ! is_object( $category ) ) { 22 $category = (int) $category; 23 } 24 25 $category = get_term_link( $category ); 26 27 if ( is_wp_error( $category ) ) { 28 return ''; 29 } 30 31 return $category; 32 } 33 34 /** 35 * Retrieves category parents with separator. 36 * 37 * @since 1.2.0 38 * @since 4.8.0 The `$visited` parameter was deprecated and renamed to `$deprecated`. 39 * 40 * @param int $category_id Category ID. 41 * @param bool $link Optional. Whether to format with link. Default false. 42 * @param string $separator Optional. How to separate categories. Default '/'. 43 * @param bool $nicename Optional. Whether to use nice name for display. Default false. 44 * @param array $deprecated Not used. 45 * @return string|WP_Error A list of category parents on success, WP_Error on failure. 46 */ 47 function get_category_parents( $category_id, $link = false, $separator = '/', $nicename = false, $deprecated = array() ) { 48 49 if ( ! empty( $deprecated ) ) { 50 _deprecated_argument( __FUNCTION__, '4.8.0' ); 51 } 52 53 $format = $nicename ? 'slug' : 'name'; 54 55 $args = array( 56 'separator' => $separator, 57 'link' => $link, 58 'format' => $format, 59 ); 60 61 return get_term_parents_list( $category_id, 'category', $args ); 62 } 63 64 /** 65 * Retrieves post categories. 66 * 67 * This tag may be used outside The Loop by passing a post ID as the parameter. 68 * 69 * Note: This function only returns results from the default "category" taxonomy. 70 * For custom taxonomies use get_the_terms(). 71 * 72 * @since 0.71 73 * 74 * @param int|false $post_id Optional. The post ID. Defaults to current post ID. 75 * @return WP_Term[] Array of WP_Term objects, one for each category assigned to the post. 76 */ 77 function get_the_category( $post_id = false ) { 78 $categories = get_the_terms( $post_id, 'category' ); 79 if ( ! $categories || is_wp_error( $categories ) ) { 80 $categories = array(); 81 } 82 83 $categories = array_values( $categories ); 84 85 foreach ( array_keys( $categories ) as $key ) { 86 _make_cat_compat( $categories[ $key ] ); 87 } 88 89 /** 90 * Filters the array of categories to return for a post. 91 * 92 * @since 3.1.0 93 * @since 4.4.0 Added the `$post_id` parameter. 94 * 95 * @param WP_Term[] $categories An array of categories to return for the post. 96 * @param int|false $post_id The post ID. 97 */ 98 return apply_filters( 'get_the_categories', $categories, $post_id ); 99 } 100 101 /** 102 * Retrieves category name based on category ID. 103 * 104 * @since 0.71 105 * 106 * @param int $cat_id Category ID. 107 * @return string|WP_Error Category name on success, WP_Error on failure. 108 */ 109 function get_the_category_by_ID( $cat_id ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid 110 $cat_id = (int) $cat_id; 111 $category = get_term( $cat_id ); 112 113 if ( is_wp_error( $category ) ) { 114 return $category; 115 } 116 117 return ( $category ) ? $category->name : ''; 118 } 119 120 /** 121 * Retrieves category list for a post in either HTML list or custom format. 122 * 123 * Generally used for quick, delimited (e.g. comma-separated) lists of categories, 124 * as part of a post entry meta. 125 * 126 * For a more powerful, list-based function, see wp_list_categories(). 127 * 128 * @since 1.5.1 129 * 130 * @see wp_list_categories() 131 * 132 * @global WP_Rewrite $wp_rewrite WordPress rewrite component. 133 * 134 * @param string $separator Optional. Separator between the categories. By default, the links are placed 135 * in an unordered list. An empty string will result in the default behavior. 136 * @param string $parents Optional. How to display the parents. Accepts 'multiple', 'single', or empty. 137 * Default empty string. 138 * @param int|false $post_id Optional. ID of the post to retrieve categories for. Defaults to the current post. 139 * @return string Category list for a post. 140 */ 141 function get_the_category_list( $separator = '', $parents = '', $post_id = false ) { 142 global $wp_rewrite; 143 144 if ( ! is_object_in_taxonomy( get_post_type( $post_id ), 'category' ) ) { 145 /** This filter is documented in wp-includes/category-template.php */ 146 return apply_filters( 'the_category', '', $separator, $parents ); 147 } 148 149 /** 150 * Filters the categories before building the category list. 151 * 152 * @since 4.4.0 153 * 154 * @param WP_Term[] $categories An array of the post's categories. 155 * @param int|false $post_id ID of the post to retrieve categories for. 156 * When `false`, defaults to the current post in the loop. 157 */ 158 $categories = apply_filters( 'the_category_list', get_the_category( $post_id ), $post_id ); 159 160 if ( empty( $categories ) ) { 161 /** This filter is documented in wp-includes/category-template.php */ 162 return apply_filters( 'the_category', __( 'Uncategorized' ), $separator, $parents ); 163 } 164 165 $rel = ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"'; 166 167 $thelist = ''; 168 if ( '' === $separator ) { 169 $thelist .= '<ul class="post-categories">'; 170 foreach ( $categories as $category ) { 171 $thelist .= "\n\t<li>"; 172 switch ( strtolower( $parents ) ) { 173 case 'multiple': 174 if ( $category->parent ) { 175 $thelist .= get_category_parents( $category->parent, true, $separator ); 176 } 177 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name . '</a></li>'; 178 break; 179 case 'single': 180 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>'; 181 if ( $category->parent ) { 182 $thelist .= get_category_parents( $category->parent, false, $separator ); 183 } 184 $thelist .= $category->name . '</a></li>'; 185 break; 186 case '': 187 default: 188 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name . '</a></li>'; 189 } 190 } 191 $thelist .= '</ul>'; 192 } else { 193 $i = 0; 194 foreach ( $categories as $category ) { 195 if ( 0 < $i ) { 196 $thelist .= $separator; 197 } 198 switch ( strtolower( $parents ) ) { 199 case 'multiple': 200 if ( $category->parent ) { 201 $thelist .= get_category_parents( $category->parent, true, $separator ); 202 } 203 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name . '</a>'; 204 break; 205 case 'single': 206 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>'; 207 if ( $category->parent ) { 208 $thelist .= get_category_parents( $category->parent, false, $separator ); 209 } 210 $thelist .= "$category->name</a>"; 211 break; 212 case '': 213 default: 214 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name . '</a>'; 215 } 216 ++$i; 217 } 218 } 219 220 /** 221 * Filters the category or list of categories. 222 * 223 * @since 1.2.0 224 * 225 * @param string $thelist List of categories for the current post. 226 * @param string $separator Separator used between the categories. 227 * @param string $parents How to display the category parents. Accepts 'multiple', 228 * 'single', or empty. 229 */ 230 return apply_filters( 'the_category', $thelist, $separator, $parents ); 231 } 232 233 /** 234 * Checks if the current post is within any of the given categories. 235 * 236 * The given categories are checked against the post's categories' term_ids, names and slugs. 237 * Categories given as integers will only be checked against the post's categories' term_ids. 238 * 239 * Prior to v2.5 of WordPress, category names were not supported. 240 * Prior to v2.7, category slugs were not supported. 241 * Prior to v2.7, only one category could be compared: in_category( $single_category ). 242 * Prior to v2.7, this function could only be used in the WordPress Loop. 243 * As of 2.7, the function can be used anywhere if it is provided a post ID or post object. 244 * 245 * For more information on this and similar theme functions, check out 246 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 247 * Conditional Tags} article in the Theme Developer Handbook. 248 * 249 * @since 1.2.0 250 * @since 2.7.0 The `$post` parameter was added. 251 * 252 * @param int|string|int[]|string[] $category Category ID, name, slug, or array of such 253 * to check against. 254 * @param int|null|WP_Post $post Optional. Post to check. Defaults to the current post. 255 * @return bool True if the current post is in any of the given categories. 256 */ 257 function in_category( $category, $post = null ) { 258 if ( empty( $category ) ) { 259 return false; 260 } 261 262 return has_category( $category, $post ); 263 } 264 265 /** 266 * Displays category list for a post in either HTML list or custom format. 267 * 268 * @since 0.71 269 * 270 * @param string $separator Optional. Separator between the categories. By default, the links are placed 271 * in an unordered list. An empty string will result in the default behavior. 272 * @param string $parents Optional. How to display the parents. Accepts 'multiple', 'single', or empty. 273 * Default empty string. 274 * @param int|false $post_id Optional. ID of the post to retrieve categories for. Defaults to the current post. 275 */ 276 function the_category( $separator = '', $parents = '', $post_id = false ) { 277 echo get_the_category_list( $separator, $parents, $post_id ); 278 } 279 280 /** 281 * Retrieves category description. 282 * 283 * @since 1.0.0 284 * 285 * @param int $category Optional. Category ID. Defaults to the current category ID. 286 * @return string Category description, if available. 287 */ 288 function category_description( $category = 0 ) { 289 return term_description( $category ); 290 } 291 292 /** 293 * Displays or retrieves the HTML dropdown list of categories. 294 * 295 * The 'hierarchical' argument, which is disabled by default, will override the 296 * depth argument, unless it is true. When the argument is false, it will 297 * display all of the categories. When it is enabled it will use the value in 298 * the 'depth' argument. 299 * 300 * @since 2.1.0 301 * @since 4.2.0 Introduced the `value_field` argument. 302 * @since 4.6.0 Introduced the `required` argument. 303 * @since 6.1.0 Introduced the `aria_describedby` argument. 304 * 305 * @param array|string $args { 306 * Optional. Array or string of arguments to generate a categories drop-down element. See WP_Term_Query::__construct() 307 * for information on additional accepted arguments. 308 * 309 * @type string $show_option_all Text to display for showing all categories. Default empty. 310 * @type string $show_option_none Text to display for showing no categories. Default empty. 311 * @type string $option_none_value Value to use when no category is selected. Default empty. 312 * @type string $orderby Which column to use for ordering categories. See get_terms() for a list 313 * of accepted values. Default 'id' (term_id). 314 * @type bool $pad_counts See get_terms() for an argument description. Default false. 315 * @type bool|int $show_count Whether to include post counts. Accepts 0, 1, or their bool equivalents. 316 * Default 0. 317 * @type bool|int $echo Whether to echo or return the generated markup. Accepts 0, 1, or their 318 * bool equivalents. Default 1. 319 * @type bool|int $hierarchical Whether to traverse the taxonomy hierarchy. Accepts 0, 1, or their bool 320 * equivalents. Default 0. 321 * @type int $depth Maximum depth. Default 0. 322 * @type int $tab_index Tab index for the select element. Default 0 (no tabindex). 323 * @type string $name Value for the 'name' attribute of the select element. Default 'cat'. 324 * @type string $id Value for the 'id' attribute of the select element. Defaults to the value 325 * of `$name`. 326 * @type string $class Value for the 'class' attribute of the select element. Default 'postform'. 327 * @type int|string $selected Value of the option that should be selected. Default 0. 328 * @type string $value_field Term field that should be used to populate the 'value' attribute 329 * of the option elements. Accepts any valid term field: 'term_id', 'name', 330 * 'slug', 'term_group', 'term_taxonomy_id', 'taxonomy', 'description', 331 * 'parent', 'count'. Default 'term_id'. 332 * @type string|array $taxonomy Name of the taxonomy or taxonomies to retrieve. Default 'category'. 333 * @type bool $hide_if_empty True to skip generating markup if no categories are found. 334 * Default false (create select element even if no categories are found). 335 * @type bool $required Whether the `<select>` element should have the HTML5 'required' attribute. 336 * Default false. 337 * @type Walker $walker Walker object to use to build the output. Default empty which results in a 338 * Walker_CategoryDropdown instance being used. 339 * @type string $aria_describedby The 'id' of an element that contains descriptive text for the select. 340 * Default empty string. 341 * } 342 * @return string HTML dropdown list of categories. 343 */ 344 function wp_dropdown_categories( $args = '' ) { 345 $defaults = array( 346 'show_option_all' => '', 347 'show_option_none' => '', 348 'orderby' => 'id', 349 'order' => 'ASC', 350 'show_count' => 0, 351 'hide_empty' => 1, 352 'child_of' => 0, 353 'exclude' => '', 354 'echo' => 1, 355 'selected' => 0, 356 'hierarchical' => 0, 357 'name' => 'cat', 358 'id' => '', 359 'class' => 'postform', 360 'depth' => 0, 361 'tab_index' => 0, 362 'taxonomy' => 'category', 363 'hide_if_empty' => false, 364 'option_none_value' => -1, 365 'value_field' => 'term_id', 366 'required' => false, 367 'aria_describedby' => '', 368 ); 369 370 $defaults['selected'] = ( is_category() ) ? get_query_var( 'cat' ) : 0; 371 372 // Back compat. 373 if ( isset( $args['type'] ) && 'link' === $args['type'] ) { 374 _deprecated_argument( 375 __FUNCTION__, 376 '3.0.0', 377 sprintf( 378 /* translators: 1: "type => link", 2: "taxonomy => link_category" */ 379 __( '%1$s is deprecated. Use %2$s instead.' ), 380 '<code>type => link</code>', 381 '<code>taxonomy => link_category</code>' 382 ) 383 ); 384 $args['taxonomy'] = 'link_category'; 385 } 386 387 // Parse incoming $args into an array and merge it with $defaults. 388 $parsed_args = wp_parse_args( $args, $defaults ); 389 390 $option_none_value = $parsed_args['option_none_value']; 391 392 if ( ! isset( $parsed_args['pad_counts'] ) && $parsed_args['show_count'] && $parsed_args['hierarchical'] ) { 393 $parsed_args['pad_counts'] = true; 394 } 395 396 $tab_index = $parsed_args['tab_index']; 397 398 $tab_index_attribute = ''; 399 if ( (int) $tab_index > 0 ) { 400 $tab_index_attribute = " tabindex=\"$tab_index\""; 401 } 402 403 // Avoid clashes with the 'name' param of get_terms(). 404 $get_terms_args = $parsed_args; 405 unset( $get_terms_args['name'] ); 406 $categories = get_terms( $get_terms_args ); 407 408 $name = esc_attr( $parsed_args['name'] ); 409 $class = esc_attr( $parsed_args['class'] ); 410 $id = $parsed_args['id'] ? esc_attr( $parsed_args['id'] ) : $name; 411 $required = $parsed_args['required'] ? 'required' : ''; 412 413 $aria_describedby_attribute = $parsed_args['aria_describedby'] ? ' aria-describedby="' . esc_attr( $parsed_args['aria_describedby'] ) . '"' : ''; 414 415 if ( ! $parsed_args['hide_if_empty'] || ! empty( $categories ) ) { 416 $output = "<select $required name='$name' id='$id' class='$class'$tab_index_attribute$aria_describedby_attribute>\n"; 417 } else { 418 $output = ''; 419 } 420 if ( empty( $categories ) && ! $parsed_args['hide_if_empty'] && ! empty( $parsed_args['show_option_none'] ) ) { 421 422 /** 423 * Filters a taxonomy drop-down display element. 424 * 425 * A variety of taxonomy drop-down display elements can be modified 426 * just prior to display via this filter. Filterable arguments include 427 * 'show_option_none', 'show_option_all', and various forms of the 428 * term name. 429 * 430 * @since 1.2.0 431 * 432 * @see wp_dropdown_categories() 433 * 434 * @param string $element Category name. 435 * @param WP_Term|null $category The category object, or null if there's no corresponding category. 436 */ 437 $show_option_none = apply_filters( 'list_cats', $parsed_args['show_option_none'], null ); 438 $output .= "\t<option value='" . esc_attr( $option_none_value ) . "' selected='selected'>$show_option_none</option>\n"; 439 } 440 441 if ( ! empty( $categories ) ) { 442 443 if ( $parsed_args['show_option_all'] ) { 444 445 /** This filter is documented in wp-includes/category-template.php */ 446 $show_option_all = apply_filters( 'list_cats', $parsed_args['show_option_all'], null ); 447 $selected = ( '0' === (string) $parsed_args['selected'] ) ? " selected='selected'" : ''; 448 $output .= "\t<option value='0'$selected>$show_option_all</option>\n"; 449 } 450 451 if ( $parsed_args['show_option_none'] ) { 452 453 /** This filter is documented in wp-includes/category-template.php */ 454 $show_option_none = apply_filters( 'list_cats', $parsed_args['show_option_none'], null ); 455 $selected = selected( $option_none_value, $parsed_args['selected'], false ); 456 $output .= "\t<option value='" . esc_attr( $option_none_value ) . "'$selected>$show_option_none</option>\n"; 457 } 458 459 if ( $parsed_args['hierarchical'] ) { 460 $depth = $parsed_args['depth']; // Walk the full depth. 461 } else { 462 $depth = -1; // Flat. 463 } 464 $output .= walk_category_dropdown_tree( $categories, $depth, $parsed_args ); 465 } 466 467 if ( ! $parsed_args['hide_if_empty'] || ! empty( $categories ) ) { 468 $output .= "</select>\n"; 469 } 470 471 /** 472 * Filters the taxonomy drop-down output. 473 * 474 * @since 2.1.0 475 * 476 * @param string $output HTML output. 477 * @param array $parsed_args Arguments used to build the drop-down. 478 */ 479 $output = apply_filters( 'wp_dropdown_cats', $output, $parsed_args ); 480 481 if ( $parsed_args['echo'] ) { 482 echo $output; 483 } 484 485 return $output; 486 } 487 488 /** 489 * Displays or retrieves the HTML list of categories. 490 * 491 * @since 2.1.0 492 * @since 4.4.0 Introduced the `hide_title_if_empty` and `separator` arguments. 493 * @since 4.4.0 The `current_category` argument was modified to optionally accept an array of values. 494 * @since 6.1.0 Default value of the 'use_desc_for_title' argument was changed from 1 to 0. 495 * 496 * @param array|string $args { 497 * Array of optional arguments. See get_categories(), get_terms(), and WP_Term_Query::__construct() 498 * for information on additional accepted arguments. 499 * 500 * @type int|int[] $current_category ID of category, or array of IDs of categories, that should get the 501 * 'current-cat' class. Default 0. 502 * @type int $depth Category depth. Used for tab indentation. Default 0. 503 * @type bool|int $echo Whether to echo or return the generated markup. Accepts 0, 1, or their 504 * bool equivalents. Default 1. 505 * @type int[]|string $exclude Array or comma/space-separated string of term IDs to exclude. 506 * If `$hierarchical` is true, descendants of `$exclude` terms will also 507 * be excluded; see `$exclude_tree`. See get_terms(). 508 * Default empty string. 509 * @type int[]|string $exclude_tree Array or comma/space-separated string of term IDs to exclude, along 510 * with their descendants. See get_terms(). Default empty string. 511 * @type string $feed Text to use for the feed link. Default 'Feed for all posts filed 512 * under [cat name]'. 513 * @type string $feed_image URL of an image to use for the feed link. Default empty string. 514 * @type string $feed_type Feed type. Used to build feed link. See get_term_feed_link(). 515 * Default empty string (default feed). 516 * @type bool $hide_title_if_empty Whether to hide the `$title_li` element if there are no terms in 517 * the list. Default false (title will always be shown). 518 * @type string $separator Separator between links. Default '<br />'. 519 * @type bool|int $show_count Whether to include post counts. Accepts 0, 1, or their bool equivalents. 520 * Default 0. 521 * @type string $show_option_all Text to display for showing all categories. Default empty string. 522 * @type string $show_option_none Text to display for the 'no categories' option. 523 * Default 'No categories'. 524 * @type string $style The style used to display the categories list. If 'list', categories 525 * will be output as an unordered list. If left empty or another value, 526 * categories will be output separated by `<br>` tags. Default 'list'. 527 * @type string $taxonomy Name of the taxonomy to retrieve. Default 'category'. 528 * @type string $title_li Text to use for the list title `<li>` element. Pass an empty string 529 * to disable. Default 'Categories'. 530 * @type bool|int $use_desc_for_title Whether to use the category description as the title attribute. 531 * Accepts 0, 1, or their bool equivalents. Default 0. 532 * @type Walker $walker Walker object to use to build the output. Default empty which results 533 * in a Walker_Category instance being used. 534 * } 535 * @return void|string|false Void if 'echo' argument is true, HTML list of categories if 'echo' is false. 536 * False if the taxonomy does not exist. 537 */ 538 function wp_list_categories( $args = '' ) { 539 $defaults = array( 540 'child_of' => 0, 541 'current_category' => 0, 542 'depth' => 0, 543 'echo' => 1, 544 'exclude' => '', 545 'exclude_tree' => '', 546 'feed' => '', 547 'feed_image' => '', 548 'feed_type' => '', 549 'hide_empty' => 1, 550 'hide_title_if_empty' => false, 551 'hierarchical' => true, 552 'order' => 'ASC', 553 'orderby' => 'name', 554 'separator' => '<br />', 555 'show_count' => 0, 556 'show_option_all' => '', 557 'show_option_none' => __( 'No categories' ), 558 'style' => 'list', 559 'taxonomy' => 'category', 560 'title_li' => __( 'Categories' ), 561 'use_desc_for_title' => 0, 562 ); 563 564 $parsed_args = wp_parse_args( $args, $defaults ); 565 566 if ( ! isset( $parsed_args['pad_counts'] ) && $parsed_args['show_count'] && $parsed_args['hierarchical'] ) { 567 $parsed_args['pad_counts'] = true; 568 } 569 570 // Descendants of exclusions should be excluded too. 571 if ( $parsed_args['hierarchical'] ) { 572 $exclude_tree = array(); 573 574 if ( $parsed_args['exclude_tree'] ) { 575 $exclude_tree = array_merge( $exclude_tree, wp_parse_id_list( $parsed_args['exclude_tree'] ) ); 576 } 577 578 if ( $parsed_args['exclude'] ) { 579 $exclude_tree = array_merge( $exclude_tree, wp_parse_id_list( $parsed_args['exclude'] ) ); 580 } 581 582 $parsed_args['exclude_tree'] = $exclude_tree; 583 $parsed_args['exclude'] = ''; 584 } 585 586 if ( ! isset( $parsed_args['class'] ) ) { 587 $parsed_args['class'] = ( 'category' === $parsed_args['taxonomy'] ) ? 'categories' : $parsed_args['taxonomy']; 588 } 589 590 if ( ! taxonomy_exists( $parsed_args['taxonomy'] ) ) { 591 return false; 592 } 593 594 $show_option_all = $parsed_args['show_option_all']; 595 $show_option_none = $parsed_args['show_option_none']; 596 597 $categories = get_categories( $parsed_args ); 598 599 $output = ''; 600 601 if ( $parsed_args['title_li'] && 'list' === $parsed_args['style'] 602 && ( ! empty( $categories ) || ! $parsed_args['hide_title_if_empty'] ) 603 ) { 604 $output = '<li class="' . esc_attr( $parsed_args['class'] ) . '">' . $parsed_args['title_li'] . '<ul>'; 605 } 606 607 if ( empty( $categories ) ) { 608 if ( ! empty( $show_option_none ) ) { 609 if ( 'list' === $parsed_args['style'] ) { 610 $output .= '<li class="cat-item-none">' . $show_option_none . '</li>'; 611 } else { 612 $output .= $show_option_none; 613 } 614 } 615 } else { 616 if ( ! empty( $show_option_all ) ) { 617 618 $posts_page = ''; 619 620 // For taxonomies that belong only to custom post types, point to a valid archive. 621 $taxonomy_object = get_taxonomy( $parsed_args['taxonomy'] ); 622 if ( ! in_array( 'post', $taxonomy_object->object_type, true ) && ! in_array( 'page', $taxonomy_object->object_type, true ) ) { 623 foreach ( $taxonomy_object->object_type as $object_type ) { 624 $_object_type = get_post_type_object( $object_type ); 625 626 // Grab the first one. 627 if ( ! empty( $_object_type->has_archive ) ) { 628 $posts_page = get_post_type_archive_link( $object_type ); 629 break; 630 } 631 } 632 } 633 634 // Fallback for the 'All' link is the posts page. 635 if ( ! $posts_page ) { 636 if ( 'page' === get_option( 'show_on_front' ) && get_option( 'page_for_posts' ) ) { 637 $posts_page = get_permalink( get_option( 'page_for_posts' ) ); 638 } else { 639 $posts_page = home_url( '/' ); 640 } 641 } 642 643 $posts_page = esc_url( $posts_page ); 644 if ( 'list' === $parsed_args['style'] ) { 645 $output .= "<li class='cat-item-all'><a href='$posts_page'>$show_option_all</a></li>"; 646 } else { 647 $output .= "<a href='$posts_page'>$show_option_all</a>"; 648 } 649 } 650 651 if ( empty( $parsed_args['current_category'] ) && ( is_category() || is_tax() || is_tag() ) ) { 652 $current_term_object = get_queried_object(); 653 if ( $current_term_object && $parsed_args['taxonomy'] === $current_term_object->taxonomy ) { 654 $parsed_args['current_category'] = get_queried_object_id(); 655 } 656 } 657 658 if ( $parsed_args['hierarchical'] ) { 659 $depth = $parsed_args['depth']; 660 } else { 661 $depth = -1; // Flat. 662 } 663 $output .= walk_category_tree( $categories, $depth, $parsed_args ); 664 } 665 666 if ( $parsed_args['title_li'] && 'list' === $parsed_args['style'] 667 && ( ! empty( $categories ) || ! $parsed_args['hide_title_if_empty'] ) 668 ) { 669 $output .= '</ul></li>'; 670 } 671 672 /** 673 * Filters the HTML output of a taxonomy list. 674 * 675 * @since 2.1.0 676 * 677 * @param string $output HTML output. 678 * @param array|string $args An array or query string of taxonomy-listing arguments. See 679 * wp_list_categories() for information on accepted arguments. 680 */ 681 $html = apply_filters( 'wp_list_categories', $output, $args ); 682 683 if ( $parsed_args['echo'] ) { 684 echo $html; 685 } else { 686 return $html; 687 } 688 } 689 690 /** 691 * Displays a tag cloud. 692 * 693 * Outputs a list of tags in what is called a 'tag cloud', where the size of each tag 694 * is determined by how many times that particular tag has been assigned to posts. 695 * 696 * @since 2.3.0 697 * @since 2.8.0 Added the `taxonomy` argument. 698 * @since 4.8.0 Added the `show_count` argument. 699 * 700 * @param array|string $args { 701 * Optional. Array or string of arguments for displaying a tag cloud. See wp_generate_tag_cloud() 702 * and get_terms() for the full lists of arguments that can be passed in `$args`. 703 * 704 * @type int $number The number of tags to display. Accepts any positive integer 705 * or zero to return all. Default 45. 706 * @type string $link Whether to display term editing links or term permalinks. 707 * Accepts 'edit' and 'view'. Default 'view'. 708 * @type string $post_type The post type. Used to highlight the proper post type menu 709 * on the linked edit page. Defaults to the first post type 710 * associated with the taxonomy. 711 * @type bool $echo Whether or not to echo the return value. Default true. 712 * } 713 * @return void|string|string[] Void if 'echo' argument is true, or on failure. Otherwise, tag cloud 714 * as a string or an array, depending on 'format' argument. 715 */ 716 function wp_tag_cloud( $args = '' ) { 717 $defaults = array( 718 'smallest' => 8, 719 'largest' => 22, 720 'unit' => 'pt', 721 'number' => 45, 722 'format' => 'flat', 723 'separator' => "\n", 724 'orderby' => 'name', 725 'order' => 'ASC', 726 'exclude' => '', 727 'include' => '', 728 'link' => 'view', 729 'taxonomy' => 'post_tag', 730 'post_type' => '', 731 'echo' => true, 732 'show_count' => 0, 733 ); 734 735 $args = wp_parse_args( $args, $defaults ); 736 737 $tags = get_terms( 738 array_merge( 739 $args, 740 array( 741 'orderby' => 'count', 742 'order' => 'DESC', 743 ) 744 ) 745 ); // Always query top tags. 746 747 if ( empty( $tags ) || is_wp_error( $tags ) ) { 748 return; 749 } 750 751 foreach ( $tags as $key => $tag ) { 752 if ( 'edit' === $args['link'] ) { 753 $link = get_edit_term_link( $tag, $tag->taxonomy, $args['post_type'] ); 754 } else { 755 $link = get_term_link( $tag, $tag->taxonomy ); 756 } 757 758 if ( is_wp_error( $link ) ) { 759 return; 760 } 761 762 $tags[ $key ]->link = $link; 763 $tags[ $key ]->id = $tag->term_id; 764 } 765 766 // Here's where those top tags get sorted according to $args. 767 $return = wp_generate_tag_cloud( $tags, $args ); 768 769 /** 770 * Filters the tag cloud output. 771 * 772 * @since 2.3.0 773 * 774 * @param string|string[] $return Tag cloud as a string or an array, depending on 'format' argument. 775 * @param array $args An array of tag cloud arguments. See wp_tag_cloud() 776 * for information on accepted arguments. 777 */ 778 $return = apply_filters( 'wp_tag_cloud', $return, $args ); 779 780 if ( 'array' === $args['format'] || empty( $args['echo'] ) ) { 781 return $return; 782 } 783 784 echo $return; 785 } 786 787 /** 788 * Default topic count scaling for tag links. 789 * 790 * @since 2.9.0 791 * 792 * @param int $count Number of posts with that tag. 793 * @return int Scaled count. 794 */ 795 function default_topic_count_scale( $count ) { 796 return (int) round( log10( $count + 1 ) * 100 ); 797 } 798 799 /** 800 * Generates a tag cloud (heatmap) from provided data. 801 * 802 * @todo Complete functionality. 803 * @since 2.3.0 804 * @since 4.8.0 Added the `show_count` argument. 805 * 806 * @param WP_Term[] $tags Array of WP_Term objects to generate the tag cloud for. 807 * @param string|array $args { 808 * Optional. Array or string of arguments for generating a tag cloud. 809 * 810 * @type int $smallest Smallest font size used to display tags. Paired 811 * with the value of `$unit`, to determine CSS text 812 * size unit. Default 8 (pt). 813 * @type int $largest Largest font size used to display tags. Paired 814 * with the value of `$unit`, to determine CSS text 815 * size unit. Default 22 (pt). 816 * @type string $unit CSS text size unit to use with the `$smallest` 817 * and `$largest` values. Accepts any valid CSS text 818 * size unit. Default 'pt'. 819 * @type int $number The number of tags to return. Accepts any 820 * positive integer or zero to return all. 821 * Default 0. 822 * @type string $format Format to display the tag cloud in. Accepts 'flat' 823 * (tags separated with spaces), 'list' (tags displayed 824 * in an unordered list), or 'array' (returns an array). 825 * Default 'flat'. 826 * @type string $separator HTML or text to separate the tags. Default "\n" (newline). 827 * @type string $orderby Value to order tags by. Accepts 'name' or 'count'. 828 * Default 'name'. The {@see 'tag_cloud_sort'} filter 829 * can also affect how tags are sorted. 830 * @type string $order How to order the tags. Accepts 'ASC' (ascending), 831 * 'DESC' (descending), or 'RAND' (random). Default 'ASC'. 832 * @type int|bool $filter Whether to enable filtering of the final output 833 * via {@see 'wp_generate_tag_cloud'}. Default 1. 834 * @type array $topic_count_text Nooped plural text from _n_noop() to supply to 835 * tag counts. Default null. 836 * @type callable $topic_count_text_callback Callback used to generate nooped plural text for 837 * tag counts based on the count. Default null. 838 * @type callable $topic_count_scale_callback Callback used to determine the tag count scaling 839 * value. Default default_topic_count_scale(). 840 * @type bool|int $show_count Whether to display the tag counts. Default 0. Accepts 841 * 0, 1, or their bool equivalents. 842 * } 843 * @return string|string[] Tag cloud as a string or an array, depending on 'format' argument. 844 */ 845 function wp_generate_tag_cloud( $tags, $args = '' ) { 846 $defaults = array( 847 'smallest' => 8, 848 'largest' => 22, 849 'unit' => 'pt', 850 'number' => 0, 851 'format' => 'flat', 852 'separator' => "\n", 853 'orderby' => 'name', 854 'order' => 'ASC', 855 'topic_count_text' => null, 856 'topic_count_text_callback' => null, 857 'topic_count_scale_callback' => 'default_topic_count_scale', 858 'filter' => 1, 859 'show_count' => 0, 860 ); 861 862 $args = wp_parse_args( $args, $defaults ); 863 864 $return = ( 'array' === $args['format'] ) ? array() : ''; 865 866 if ( empty( $tags ) ) { 867 return $return; 868 } 869 870 // Juggle topic counts. 871 if ( isset( $args['topic_count_text'] ) ) { 872 // First look for nooped plural support via topic_count_text. 873 $translate_nooped_plural = $args['topic_count_text']; 874 } elseif ( ! empty( $args['topic_count_text_callback'] ) ) { 875 // Look for the alternative callback style. Ignore the previous default. 876 if ( 'default_topic_count_text' === $args['topic_count_text_callback'] ) { 877 /* translators: %s: Number of items (tags). */ 878 $translate_nooped_plural = _n_noop( '%s item', '%s items' ); 879 } else { 880 $translate_nooped_plural = false; 881 } 882 } elseif ( isset( $args['single_text'] ) && isset( $args['multiple_text'] ) ) { 883 // If no callback exists, look for the old-style single_text and multiple_text arguments. 884 // phpcs:ignore WordPress.WP.I18n.NonSingularStringLiteralSingular,WordPress.WP.I18n.NonSingularStringLiteralPlural 885 $translate_nooped_plural = _n_noop( $args['single_text'], $args['multiple_text'] ); 886 } else { 887 // This is the default for when no callback, plural, or argument is passed in. 888 /* translators: %s: Number of items (tags). */ 889 $translate_nooped_plural = _n_noop( '%s item', '%s items' ); 890 } 891 892 /** 893 * Filters how the items in a tag cloud are sorted. 894 * 895 * @since 2.8.0 896 * 897 * @param WP_Term[] $tags Ordered array of terms. 898 * @param array $args An array of tag cloud arguments. 899 */ 900 $tags_sorted = apply_filters( 'tag_cloud_sort', $tags, $args ); 901 if ( empty( $tags_sorted ) ) { 902 return $return; 903 } 904 905 if ( $tags_sorted !== $tags ) { 906 $tags = $tags_sorted; 907 unset( $tags_sorted ); 908 } else { 909 if ( 'RAND' === $args['order'] ) { 910 shuffle( $tags ); 911 } else { 912 // SQL cannot save you; this is a second (potentially different) sort on a subset of data. 913 if ( 'name' === $args['orderby'] ) { 914 uasort( $tags, '_wp_object_name_sort_cb' ); 915 } else { 916 uasort( $tags, '_wp_object_count_sort_cb' ); 917 } 918 919 if ( 'DESC' === $args['order'] ) { 920 $tags = array_reverse( $tags, true ); 921 } 922 } 923 } 924 925 if ( $args['number'] > 0 ) { 926 $tags = array_slice( $tags, 0, $args['number'] ); 927 } 928 929 $counts = array(); 930 $real_counts = array(); // For the alt tag. 931 foreach ( (array) $tags as $key => $tag ) { 932 $real_counts[ $key ] = $tag->count; 933 $counts[ $key ] = call_user_func( $args['topic_count_scale_callback'], $tag->count ); 934 } 935 936 $min_count = min( $counts ); 937 $spread = max( $counts ) - $min_count; 938 if ( $spread <= 0 ) { 939 $spread = 1; 940 } 941 $font_spread = $args['largest'] - $args['smallest']; 942 if ( $font_spread < 0 ) { 943 $font_spread = 1; 944 } 945 $font_step = $font_spread / $spread; 946 947 $aria_label = false; 948 /* 949 * Determine whether to output an 'aria-label' attribute with the tag name and count. 950 * When tags have a different font size, they visually convey an important information 951 * that should be available to assistive technologies too. On the other hand, sometimes 952 * themes set up the Tag Cloud to display all tags with the same font size (setting 953 * the 'smallest' and 'largest' arguments to the same value). 954 * In order to always serve the same content to all users, the 'aria-label' gets printed out: 955 * - when tags have a different size 956 * - when the tag count is displayed (for example when users check the checkbox in the 957 * Tag Cloud widget), regardless of the tags font size 958 */ 959 if ( $args['show_count'] || 0 !== $font_spread ) { 960 $aria_label = true; 961 } 962 963 // Assemble the data that will be used to generate the tag cloud markup. 964 $tags_data = array(); 965 foreach ( $tags as $key => $tag ) { 966 $tag_id = isset( $tag->id ) ? $tag->id : $key; 967 968 $count = $counts[ $key ]; 969 $real_count = $real_counts[ $key ]; 970 971 if ( $translate_nooped_plural ) { 972 $formatted_count = sprintf( translate_nooped_plural( $translate_nooped_plural, $real_count ), number_format_i18n( $real_count ) ); 973 } else { 974 $formatted_count = call_user_func( $args['topic_count_text_callback'], $real_count, $tag, $args ); 975 } 976 977 $tags_data[] = array( 978 'id' => $tag_id, 979 'url' => ( '#' !== $tag->link ) ? $tag->link : '#', 980 'role' => ( '#' !== $tag->link ) ? '' : ' role="button"', 981 'name' => $tag->name, 982 'formatted_count' => $formatted_count, 983 'slug' => $tag->slug, 984 'real_count' => $real_count, 985 'class' => 'tag-cloud-link tag-link-' . $tag_id, 986 'font_size' => $args['smallest'] + ( $count - $min_count ) * $font_step, 987 'aria_label' => $aria_label ? sprintf( ' aria-label="%1$s (%2$s)"', esc_attr( $tag->name ), esc_attr( $formatted_count ) ) : '', 988 'show_count' => $args['show_count'] ? '<span class="tag-link-count"> (' . $real_count . ')</span>' : '', 989 ); 990 } 991 992 /** 993 * Filters the data used to generate the tag cloud. 994 * 995 * @since 4.3.0 996 * 997 * @param array[] $tags_data An array of term data arrays for terms used to generate the tag cloud. 998 */ 999 $tags_data = apply_filters( 'wp_generate_tag_cloud_data', $tags_data ); 1000 1001 $a = array(); 1002 1003 // Generate the output links array. 1004 foreach ( $tags_data as $key => $tag_data ) { 1005 $class = $tag_data['class'] . ' tag-link-position-' . ( $key + 1 ); 1006 $a[] = sprintf( 1007 '<a href="%1$s"%2$s class="%3$s" style="font-size: %4$s;"%5$s>%6$s%7$s</a>', 1008 esc_url( $tag_data['url'] ), 1009 $tag_data['role'], 1010 esc_attr( $class ), 1011 esc_attr( str_replace( ',', '.', $tag_data['font_size'] ) . $args['unit'] ), 1012 $tag_data['aria_label'], 1013 esc_html( $tag_data['name'] ), 1014 $tag_data['show_count'] 1015 ); 1016 } 1017 1018 switch ( $args['format'] ) { 1019 case 'array': 1020 $return =& $a; 1021 break; 1022 case 'list': 1023 /* 1024 * Force role="list", as some browsers (sic: Safari 10) don't expose to assistive 1025 * technologies the default role when the list is styled with `list-style: none`. 1026 * Note: this is redundant but doesn't harm. 1027 */ 1028 $return = "<ul class='wp-tag-cloud' role='list'>\n\t<li>"; 1029 $return .= implode( "</li>\n\t<li>", $a ); 1030 $return .= "</li>\n</ul>\n"; 1031 break; 1032 default: 1033 $return = implode( $args['separator'], $a ); 1034 break; 1035 } 1036 1037 if ( $args['filter'] ) { 1038 /** 1039 * Filters the generated output of a tag cloud. 1040 * 1041 * The filter is only evaluated if a true value is passed 1042 * to the $filter argument in wp_generate_tag_cloud(). 1043 * 1044 * @since 2.3.0 1045 * 1046 * @see wp_generate_tag_cloud() 1047 * 1048 * @param string[]|string $return String containing the generated HTML tag cloud output 1049 * or an array of tag links if the 'format' argument 1050 * equals 'array'. 1051 * @param WP_Term[] $tags An array of terms used in the tag cloud. 1052 * @param array $args An array of wp_generate_tag_cloud() arguments. 1053 */ 1054 return apply_filters( 'wp_generate_tag_cloud', $return, $tags, $args ); 1055 } else { 1056 return $return; 1057 } 1058 } 1059 1060 /** 1061 * Serves as a callback for comparing objects based on name. 1062 * 1063 * Used with `uasort()`. 1064 * 1065 * @since 3.1.0 1066 * @access private 1067 * 1068 * @param object $a The first object to compare. 1069 * @param object $b The second object to compare. 1070 * @return int Negative number if `$a->name` is less than `$b->name`, zero if they are equal, 1071 * or greater than zero if `$a->name` is greater than `$b->name`. 1072 */ 1073 function _wp_object_name_sort_cb( $a, $b ) { 1074 return strnatcasecmp( $a->name, $b->name ); 1075 } 1076 1077 /** 1078 * Serves as a callback for comparing objects based on count. 1079 * 1080 * Used with `uasort()`. 1081 * 1082 * @since 3.1.0 1083 * @access private 1084 * 1085 * @param object $a The first object to compare. 1086 * @param object $b The second object to compare. 1087 * @return int Negative number if `$a->count` is less than `$b->count`, zero if they are equal, 1088 * or greater than zero if `$a->count` is greater than `$b->count`. 1089 */ 1090 function _wp_object_count_sort_cb( $a, $b ) { 1091 return ( $a->count - $b->count ); 1092 } 1093 1094 // 1095 // Helper functions. 1096 // 1097 1098 /** 1099 * Retrieves HTML list content for category list. 1100 * 1101 * @since 2.1.0 1102 * @since 5.3.0 Formalized the existing `...$args` parameter by adding it 1103 * to the function signature. 1104 * 1105 * @uses Walker_Category to create HTML list content. 1106 * @see Walker::walk() for parameters and return description. 1107 * 1108 * @param mixed ...$args Elements array, maximum hierarchical depth and optional additional arguments. 1109 * @return string 1110 */ 1111 function walk_category_tree( ...$args ) { 1112 // The user's options are the third parameter. 1113 if ( empty( $args[2]['walker'] ) || ! ( $args[2]['walker'] instanceof Walker ) ) { 1114 $walker = new Walker_Category(); 1115 } else { 1116 /** 1117 * @var Walker $walker 1118 */ 1119 $walker = $args[2]['walker']; 1120 } 1121 return $walker->walk( ...$args ); 1122 } 1123 1124 /** 1125 * Retrieves HTML dropdown (select) content for category list. 1126 * 1127 * @since 2.1.0 1128 * @since 5.3.0 Formalized the existing `...$args` parameter by adding it 1129 * to the function signature. 1130 * 1131 * @uses Walker_CategoryDropdown to create HTML dropdown content. 1132 * @see Walker::walk() for parameters and return description. 1133 * 1134 * @param mixed ...$args Elements array, maximum hierarchical depth and optional additional arguments. 1135 * @return string 1136 */ 1137 function walk_category_dropdown_tree( ...$args ) { 1138 // The user's options are the third parameter. 1139 if ( empty( $args[2]['walker'] ) || ! ( $args[2]['walker'] instanceof Walker ) ) { 1140 $walker = new Walker_CategoryDropdown(); 1141 } else { 1142 /** 1143 * @var Walker $walker 1144 */ 1145 $walker = $args[2]['walker']; 1146 } 1147 return $walker->walk( ...$args ); 1148 } 1149 1150 // 1151 // Tags. 1152 // 1153 1154 /** 1155 * Retrieves the link to the tag. 1156 * 1157 * @since 2.3.0 1158 * 1159 * @see get_term_link() 1160 * 1161 * @param int|object $tag Tag ID or object. 1162 * @return string Link on success, empty string if tag does not exist. 1163 */ 1164 function get_tag_link( $tag ) { 1165 return get_category_link( $tag ); 1166 } 1167 1168 /** 1169 * Retrieves the tags for a post. 1170 * 1171 * @since 2.3.0 1172 * 1173 * @param int|WP_Post $post Post ID or object. 1174 * @return WP_Term[]|false|WP_Error Array of WP_Term objects on success, false if there are no terms 1175 * or the post does not exist, WP_Error on failure. 1176 */ 1177 function get_the_tags( $post = 0 ) { 1178 $terms = get_the_terms( $post, 'post_tag' ); 1179 1180 /** 1181 * Filters the array of tags for the given post. 1182 * 1183 * @since 2.3.0 1184 * 1185 * @see get_the_terms() 1186 * 1187 * @param WP_Term[]|false|WP_Error $terms Array of WP_Term objects on success, false if there are no terms 1188 * or the post does not exist, WP_Error on failure. 1189 */ 1190 return apply_filters( 'get_the_tags', $terms ); 1191 } 1192 1193 /** 1194 * Retrieves the tags for a post formatted as a string. 1195 * 1196 * @since 2.3.0 1197 * 1198 * @param string $before Optional. String to use before the tags. Default empty. 1199 * @param string $sep Optional. String to use between the tags. Default empty. 1200 * @param string $after Optional. String to use after the tags. Default empty. 1201 * @param int $post_id Optional. Post ID. Defaults to the current post ID. 1202 * @return string|false|WP_Error A list of tags on success, false if there are no terms, 1203 * WP_Error on failure. 1204 */ 1205 function get_the_tag_list( $before = '', $sep = '', $after = '', $post_id = 0 ) { 1206 $tag_list = get_the_term_list( $post_id, 'post_tag', $before, $sep, $after ); 1207 1208 /** 1209 * Filters the tags list for a given post. 1210 * 1211 * @since 2.3.0 1212 * 1213 * @param string $tag_list List of tags. 1214 * @param string $before String to use before the tags. 1215 * @param string $sep String to use between the tags. 1216 * @param string $after String to use after the tags. 1217 * @param int $post_id Post ID. 1218 */ 1219 return apply_filters( 'the_tags', $tag_list, $before, $sep, $after, $post_id ); 1220 } 1221 1222 /** 1223 * Displays the tags for a post. 1224 * 1225 * @since 2.3.0 1226 * 1227 * @param string $before Optional. String to use before the tags. Defaults to 'Tags:'. 1228 * @param string $sep Optional. String to use between the tags. Default ', '. 1229 * @param string $after Optional. String to use after the tags. Default empty. 1230 */ 1231 function the_tags( $before = null, $sep = ', ', $after = '' ) { 1232 if ( null === $before ) { 1233 $before = __( 'Tags: ' ); 1234 } 1235 1236 $the_tags = get_the_tag_list( $before, $sep, $after ); 1237 1238 if ( ! is_wp_error( $the_tags ) ) { 1239 echo $the_tags; 1240 } 1241 } 1242 1243 /** 1244 * Retrieves tag description. 1245 * 1246 * @since 2.8.0 1247 * 1248 * @param int $tag Optional. Tag ID. Defaults to the current tag ID. 1249 * @return string Tag description, if available. 1250 */ 1251 function tag_description( $tag = 0 ) { 1252 return term_description( $tag ); 1253 } 1254 1255 /** 1256 * Retrieves term description. 1257 * 1258 * @since 2.8.0 1259 * @since 4.9.2 The `$taxonomy` parameter was deprecated. 1260 * 1261 * @param int $term Optional. Term ID. Defaults to the current term ID. 1262 * @param null $deprecated Deprecated. Not used. 1263 * @return string Term description, if available. 1264 */ 1265 function term_description( $term = 0, $deprecated = null ) { 1266 if ( ! $term && ( is_tax() || is_tag() || is_category() ) ) { 1267 $term = get_queried_object(); 1268 if ( $term ) { 1269 $term = $term->term_id; 1270 } 1271 } 1272 1273 $description = get_term_field( 'description', $term ); 1274 1275 return is_wp_error( $description ) ? '' : $description; 1276 } 1277 1278 /** 1279 * Retrieves the terms of the taxonomy that are attached to the post. 1280 * 1281 * @since 2.5.0 1282 * 1283 * @param int|WP_Post $post Post ID or object. 1284 * @param string $taxonomy Taxonomy name. 1285 * @return WP_Term[]|false|WP_Error Array of WP_Term objects on success, false if there are no terms 1286 * or the post does not exist, WP_Error on failure. 1287 */ 1288 function get_the_terms( $post, $taxonomy ) { 1289 $post = get_post( $post ); 1290 1291 if ( ! $post ) { 1292 return false; 1293 } 1294 1295 $terms = get_object_term_cache( $post->ID, $taxonomy ); 1296 1297 if ( false === $terms ) { 1298 $terms = wp_get_object_terms( $post->ID, $taxonomy ); 1299 if ( ! is_wp_error( $terms ) ) { 1300 $term_ids = wp_list_pluck( $terms, 'term_id' ); 1301 wp_cache_add( $post->ID, $term_ids, $taxonomy . '_relationships' ); 1302 } 1303 } 1304 1305 /** 1306 * Filters the list of terms attached to the given post. 1307 * 1308 * @since 3.1.0 1309 * 1310 * @param WP_Term[]|WP_Error $terms Array of attached terms, or WP_Error on failure. 1311 * @param int $post_id Post ID. 1312 * @param string $taxonomy Name of the taxonomy. 1313 */ 1314 $terms = apply_filters( 'get_the_terms', $terms, $post->ID, $taxonomy ); 1315 1316 if ( empty( $terms ) ) { 1317 return false; 1318 } 1319 1320 return $terms; 1321 } 1322 1323 /** 1324 * Retrieves a post's terms as a list with specified format. 1325 * 1326 * Terms are linked to their respective term listing pages. 1327 * 1328 * @since 2.5.0 1329 * 1330 * @param int $post_id Post ID. 1331 * @param string $taxonomy Taxonomy name. 1332 * @param string $before Optional. String to use before the terms. Default empty. 1333 * @param string $sep Optional. String to use between the terms. Default empty. 1334 * @param string $after Optional. String to use after the terms. Default empty. 1335 * @return string|false|WP_Error A list of terms on success, false if there are no terms, 1336 * WP_Error on failure. 1337 */ 1338 function get_the_term_list( $post_id, $taxonomy, $before = '', $sep = '', $after = '' ) { 1339 $terms = get_the_terms( $post_id, $taxonomy ); 1340 1341 if ( is_wp_error( $terms ) ) { 1342 return $terms; 1343 } 1344 1345 if ( empty( $terms ) ) { 1346 return false; 1347 } 1348 1349 $links = array(); 1350 1351 foreach ( $terms as $term ) { 1352 $link = get_term_link( $term, $taxonomy ); 1353 if ( is_wp_error( $link ) ) { 1354 return $link; 1355 } 1356 $links[] = '<a href="' . esc_url( $link ) . '" rel="tag">' . $term->name . '</a>'; 1357 } 1358 1359 /** 1360 * Filters the term links for a given taxonomy. 1361 * 1362 * The dynamic portion of the hook name, `$taxonomy`, refers 1363 * to the taxonomy slug. 1364 * 1365 * Possible hook names include: 1366 * 1367 * - `term_links-category` 1368 * - `term_links-post_tag` 1369 * - `term_links-post_format` 1370 * 1371 * @since 2.5.0 1372 * 1373 * @param string[] $links An array of term links. 1374 */ 1375 $term_links = apply_filters( "term_links-{$taxonomy}", $links ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores 1376 1377 return $before . implode( $sep, $term_links ) . $after; 1378 } 1379 1380 /** 1381 * Retrieves term parents with separator. 1382 * 1383 * @since 4.8.0 1384 * 1385 * @param int $term_id Term ID. 1386 * @param string $taxonomy Taxonomy name. 1387 * @param string|array $args { 1388 * Array of optional arguments. 1389 * 1390 * @type string $format Use term names or slugs for display. Accepts 'name' or 'slug'. 1391 * Default 'name'. 1392 * @type string $separator Separator for between the terms. Default '/'. 1393 * @type bool $link Whether to format as a link. Default true. 1394 * @type bool $inclusive Include the term to get the parents for. Default true. 1395 * } 1396 * @return string|WP_Error A list of term parents on success, WP_Error or empty string on failure. 1397 */ 1398 function get_term_parents_list( $term_id, $taxonomy, $args = array() ) { 1399 $list = ''; 1400 $term = get_term( $term_id, $taxonomy ); 1401 1402 if ( is_wp_error( $term ) ) { 1403 return $term; 1404 } 1405 1406 if ( ! $term ) { 1407 return $list; 1408 } 1409 1410 $term_id = $term->term_id; 1411 1412 $defaults = array( 1413 'format' => 'name', 1414 'separator' => '/', 1415 'link' => true, 1416 'inclusive' => true, 1417 ); 1418 1419 $args = wp_parse_args( $args, $defaults ); 1420 1421 foreach ( array( 'link', 'inclusive' ) as $bool ) { 1422 $args[ $bool ] = wp_validate_boolean( $args[ $bool ] ); 1423 } 1424 1425 $parents = get_ancestors( $term_id, $taxonomy, 'taxonomy' ); 1426 1427 if ( $args['inclusive'] ) { 1428 array_unshift( $parents, $term_id ); 1429 } 1430 1431 foreach ( array_reverse( $parents ) as $term_id ) { 1432 $parent = get_term( $term_id, $taxonomy ); 1433 $name = ( 'slug' === $args['format'] ) ? $parent->slug : $parent->name; 1434 1435 if ( $args['link'] ) { 1436 $list .= '<a href="' . esc_url( get_term_link( $parent->term_id, $taxonomy ) ) . '">' . $name . '</a>' . $args['separator']; 1437 } else { 1438 $list .= $name . $args['separator']; 1439 } 1440 } 1441 1442 return $list; 1443 } 1444 1445 /** 1446 * Displays the terms for a post in a list. 1447 * 1448 * @since 2.5.0 1449 * 1450 * @param int $post_id Post ID. 1451 * @param string $taxonomy Taxonomy name. 1452 * @param string $before Optional. String to use before the terms. Default empty. 1453 * @param string $sep Optional. String to use between the terms. Default ', '. 1454 * @param string $after Optional. String to use after the terms. Default empty. 1455 * @return void|false Void on success, false on failure. 1456 */ 1457 function the_terms( $post_id, $taxonomy, $before = '', $sep = ', ', $after = '' ) { 1458 $term_list = get_the_term_list( $post_id, $taxonomy, $before, $sep, $after ); 1459 1460 if ( is_wp_error( $term_list ) ) { 1461 return false; 1462 } 1463 1464 /** 1465 * Filters the list of terms to display. 1466 * 1467 * @since 2.9.0 1468 * 1469 * @param string $term_list List of terms to display. 1470 * @param string $taxonomy The taxonomy name. 1471 * @param string $before String to use before the terms. 1472 * @param string $sep String to use between the terms. 1473 * @param string $after String to use after the terms. 1474 */ 1475 echo apply_filters( 'the_terms', $term_list, $taxonomy, $before, $sep, $after ); 1476 } 1477 1478 /** 1479 * Checks if the current post has any of given category. 1480 * 1481 * The given categories are checked against the post's categories' term_ids, names and slugs. 1482 * Categories given as integers will only be checked against the post's categories' term_ids. 1483 * 1484 * If no categories are given, determines if post has any categories. 1485 * 1486 * @since 3.1.0 1487 * 1488 * @param string|int|array $category Optional. The category name/term_id/slug, 1489 * or an array of them to check for. Default empty. 1490 * @param int|WP_Post $post Optional. Post to check. Defaults to the current post. 1491 * @return bool True if the current post has any of the given categories 1492 * (or any category, if no category specified). False otherwise. 1493 */ 1494 function has_category( $category = '', $post = null ) { 1495 return has_term( $category, 'category', $post ); 1496 } 1497 1498 /** 1499 * Checks if the current post has any of given tags. 1500 * 1501 * The given tags are checked against the post's tags' term_ids, names and slugs. 1502 * Tags given as integers will only be checked against the post's tags' term_ids. 1503 * 1504 * If no tags are given, determines if post has any tags. 1505 * 1506 * For more information on this and similar theme functions, check out 1507 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 1508 * Conditional Tags} article in the Theme Developer Handbook. 1509 * 1510 * @since 2.6.0 1511 * @since 2.7.0 Tags given as integers are only checked against 1512 * the post's tags' term_ids, not names or slugs. 1513 * @since 2.7.0 Can be used outside of the WordPress Loop if `$post` is provided. 1514 * 1515 * @param string|int|array $tag Optional. The tag name/term_id/slug, 1516 * or an array of them to check for. Default empty. 1517 * @param int|WP_Post $post Optional. Post to check. Defaults to the current post. 1518 * @return bool True if the current post has any of the given tags 1519 * (or any tag, if no tag specified). False otherwise. 1520 */ 1521 function has_tag( $tag = '', $post = null ) { 1522 return has_term( $tag, 'post_tag', $post ); 1523 } 1524 1525 /** 1526 * Checks if the current post has any of given terms. 1527 * 1528 * The given terms are checked against the post's terms' term_ids, names and slugs. 1529 * Terms given as integers will only be checked against the post's terms' term_ids. 1530 * 1531 * If no terms are given, determines if post has any terms. 1532 * 1533 * @since 3.1.0 1534 * 1535 * @param string|int|array $term Optional. The term name/term_id/slug, 1536 * or an array of them to check for. Default empty. 1537 * @param string $taxonomy Optional. Taxonomy name. Default empty. 1538 * @param int|WP_Post $post Optional. Post to check. Defaults to the current post. 1539 * @return bool True if the current post has any of the given terms 1540 * (or any term, if no term specified). False otherwise. 1541 */ 1542 function has_term( $term = '', $taxonomy = '', $post = null ) { 1543 $post = get_post( $post ); 1544 1545 if ( ! $post ) { 1546 return false; 1547 } 1548 1549 $r = is_object_in_term( $post->ID, $taxonomy, $term ); 1550 if ( is_wp_error( $r ) ) { 1551 return false; 1552 } 1553 1554 return $r; 1555 }
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