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   1  <?php
   2  /**
   3   * WordPress Export Administration API
   4   *
   5   * @package WordPress
   6   * @subpackage Administration
   7   */
   8  
   9  /**
  10   * Version number for the export format.
  11   *
  12   * Bump this when something changes that might affect compatibility.
  13   *
  14   * @since 2.5.0
  15   */
  16  define( 'WXR_VERSION', '1.2' );
  17  
  18  /**
  19   * Generates the WXR export file for download.
  20   *
  21   * Default behavior is to export all content, however, note that post content will only
  22   * be exported for post types with the `can_export` argument enabled. Any posts with the
  23   * 'auto-draft' status will be skipped.
  24   *
  25   * @since 2.1.0
  26   * @since 5.7.0 Added the `post_modified` and `post_modified_gmt` fields to the export file.
  27   *
  28   * @global wpdb    $wpdb WordPress database abstraction object.
  29   * @global WP_Post $post Global post object.
  30   *
  31   * @param array $args {
  32   *     Optional. Arguments for generating the WXR export file for download. Default empty array.
  33   *
  34   *     @type string $content    Type of content to export. If set, only the post content of this post type
  35   *                              will be exported. Accepts 'all', 'post', 'page', 'attachment', or a defined
  36   *                              custom post. If an invalid custom post type is supplied, every post type for
  37   *                              which `can_export` is enabled will be exported instead. If a valid custom post
  38   *                              type is supplied but `can_export` is disabled, then 'posts' will be exported
  39   *                              instead. When 'all' is supplied, only post types with `can_export` enabled will
  40   *                              be exported. Default 'all'.
  41   *     @type string $author     Author to export content for. Only used when `$content` is 'post', 'page', or
  42   *                              'attachment'. Accepts false (all) or a specific author ID. Default false (all).
  43   *     @type string $category   Category (slug) to export content for. Used only when `$content` is 'post'. If
  44   *                              set, only post content assigned to `$category` will be exported. Accepts false
  45   *                              or a specific category slug. Default is false (all categories).
  46   *     @type string $start_date Start date to export content from. Expected date format is 'Y-m-d'. Used only
  47   *                              when `$content` is 'post', 'page' or 'attachment'. Default false (since the
  48   *                              beginning of time).
  49   *     @type string $end_date   End date to export content to. Expected date format is 'Y-m-d'. Used only when
  50   *                              `$content` is 'post', 'page' or 'attachment'. Default false (latest publish date).
  51   *     @type string $status     Post status to export posts for. Used only when `$content` is 'post' or 'page'.
  52   *                              Accepts false (all statuses except 'auto-draft'), or a specific status, i.e.
  53   *                              'publish', 'pending', 'draft', 'auto-draft', 'future', 'private', 'inherit', or
  54   *                              'trash'. Default false (all statuses except 'auto-draft').
  55   * }
  56   */
  57  function export_wp( $args = array() ) {
  58      global $wpdb, $post;
  59  
  60      $defaults = array(
  61          'content'    => 'all',
  62          'author'     => false,
  63          'category'   => false,
  64          'start_date' => false,
  65          'end_date'   => false,
  66          'status'     => false,
  67      );
  68      $args     = wp_parse_args( $args, $defaults );
  69  
  70      /**
  71       * Fires at the beginning of an export, before any headers are sent.
  72       *
  73       * @since 2.3.0
  74       *
  75       * @param array $args An array of export arguments.
  76       */
  77      do_action( 'export_wp', $args );
  78  
  79      $sitename = sanitize_key( get_bloginfo( 'name' ) );
  80      if ( ! empty( $sitename ) ) {
  81          $sitename .= '.';
  82      }
  83      $date        = gmdate( 'Y-m-d' );
  84      $wp_filename = $sitename . 'WordPress.' . $date . '.xml';
  85      /**
  86       * Filters the export filename.
  87       *
  88       * @since 4.4.0
  89       *
  90       * @param string $wp_filename The name of the file for download.
  91       * @param string $sitename    The site name.
  92       * @param string $date        Today's date, formatted.
  93       */
  94      $filename = apply_filters( 'export_wp_filename', $wp_filename, $sitename, $date );
  95  
  96      header( 'Content-Description: File Transfer' );
  97      header( 'Content-Disposition: attachment; filename=' . $filename );
  98      header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true );
  99  
 100      if ( 'all' !== $args['content'] && post_type_exists( $args['content'] ) ) {
 101          $ptype = get_post_type_object( $args['content'] );
 102          if ( ! $ptype->can_export ) {
 103              $args['content'] = 'post';
 104          }
 105  
 106          $where = $wpdb->prepare( "{$wpdb->posts}.post_type = %s", $args['content'] );
 107      } else {
 108          $post_types = get_post_types( array( 'can_export' => true ) );
 109          $esses      = array_fill( 0, count( $post_types ), '%s' );
 110  
 111          // phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
 112          $where = $wpdb->prepare( "{$wpdb->posts}.post_type IN (" . implode( ',', $esses ) . ')', $post_types );
 113      }
 114  
 115      if ( $args['status'] && ( 'post' === $args['content'] || 'page' === $args['content'] ) ) {
 116          $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_status = %s", $args['status'] );
 117      } else {
 118          $where .= " AND {$wpdb->posts}.post_status != 'auto-draft'";
 119      }
 120  
 121      $join = '';
 122      if ( $args['category'] && 'post' === $args['content'] ) {
 123          $term = term_exists( $args['category'], 'category' );
 124          if ( $term ) {
 125              $join   = "INNER JOIN {$wpdb->term_relationships} ON ({$wpdb->posts}.ID = {$wpdb->term_relationships}.object_id)";
 126              $where .= $wpdb->prepare( " AND {$wpdb->term_relationships}.term_taxonomy_id = %d", $term['term_taxonomy_id'] );
 127          }
 128      }
 129  
 130      if ( in_array( $args['content'], array( 'post', 'page', 'attachment' ), true ) ) {
 131          if ( $args['author'] ) {
 132              $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_author = %d", $args['author'] );
 133          }
 134  
 135          if ( $args['start_date'] ) {
 136              $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date >= %s", gmdate( 'Y-m-d', strtotime( $args['start_date'] ) ) );
 137          }
 138  
 139          if ( $args['end_date'] ) {
 140              $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date < %s", gmdate( 'Y-m-d', strtotime( '+1 month', strtotime( $args['end_date'] ) ) ) );
 141          }
 142      }
 143  
 144      // Grab a snapshot of post IDs, just in case it changes during the export.
 145      $post_ids = $wpdb->get_col( "SELECT ID FROM {$wpdb->posts} $join WHERE $where" );
 146  
 147      // Get IDs for the attachments of each post, unless all content is already being exported.
 148      if ( ! in_array( $args['content'], array( 'all', 'attachment' ), true ) ) {
 149          // Array to hold all additional IDs (attachments and thumbnails).
 150          $additional_ids = array();
 151  
 152          // Create a copy of the post IDs array to avoid modifying the original array.
 153          $processing_ids = $post_ids;
 154  
 155          while ( $next_posts = array_splice( $processing_ids, 0, 20 ) ) {
 156              $posts_in     = array_map( 'absint', $next_posts );
 157              $placeholders = array_fill( 0, count( $posts_in ), '%d' );
 158  
 159              // Create a string for the placeholders.
 160              $in_placeholder = implode( ',', $placeholders );
 161  
 162              // Prepare the SQL statement for attachment ids.
 163              $attachment_ids = $wpdb->get_col(
 164                  $wpdb->prepare(
 165                      "
 166                  SELECT ID
 167                  FROM $wpdb->posts
 168                  WHERE post_parent IN ($in_placeholder) AND post_type = 'attachment'
 169                      ",
 170                      $posts_in
 171                  )
 172              );
 173  
 174              $thumbnails_ids = $wpdb->get_col(
 175                  $wpdb->prepare(
 176                      "
 177                  SELECT meta_value
 178                  FROM $wpdb->postmeta
 179                  WHERE $wpdb->postmeta.post_id IN ($in_placeholder)
 180                  AND $wpdb->postmeta.meta_key = '_thumbnail_id'
 181                      ",
 182                      $posts_in
 183                  )
 184              );
 185  
 186              $additional_ids = array_merge( $additional_ids, $attachment_ids, $thumbnails_ids );
 187          }
 188  
 189          // Merge the additional IDs back with the original post IDs after processing all posts
 190          $post_ids = array_unique( array_merge( $post_ids, $additional_ids ) );
 191      }
 192  
 193      /*
 194       * Get the requested terms ready, empty unless posts filtered by category
 195       * or all content.
 196       */
 197      $cats  = array();
 198      $tags  = array();
 199      $terms = array();
 200      if ( isset( $term ) && $term ) {
 201          $cat  = get_term( $term['term_id'], 'category' );
 202          $cats = array( $cat->term_id => $cat );
 203          unset( $term, $cat );
 204      } elseif ( 'all' === $args['content'] ) {
 205          $categories = (array) get_categories( array( 'get' => 'all' ) );
 206          $tags       = (array) get_tags( array( 'get' => 'all' ) );
 207  
 208          $custom_taxonomies = get_taxonomies( array( '_builtin' => false ) );
 209          $custom_terms      = (array) get_terms(
 210              array(
 211                  'taxonomy' => $custom_taxonomies,
 212                  'get'      => 'all',
 213              )
 214          );
 215  
 216          // Put categories in order with no child going before its parent.
 217          while ( $cat = array_shift( $categories ) ) {
 218              if ( ! $cat->parent || isset( $cats[ $cat->parent ] ) ) {
 219                  $cats[ $cat->term_id ] = $cat;
 220              } else {
 221                  $categories[] = $cat;
 222              }
 223          }
 224  
 225          // Put terms in order with no child going before its parent.
 226          while ( $t = array_shift( $custom_terms ) ) {
 227              if ( ! $t->parent || isset( $terms[ $t->parent ] ) ) {
 228                  $terms[ $t->term_id ] = $t;
 229              } else {
 230                  $custom_terms[] = $t;
 231              }
 232          }
 233  
 234          unset( $categories, $custom_taxonomies, $custom_terms );
 235      }
 236  
 237      /**
 238       * Wraps given string in XML CDATA tag.
 239       *
 240       * @since 2.1.0
 241       *
 242       * @param string|null $str String to wrap in XML CDATA tag. May be null.
 243       * @return string
 244       */
 245  	function wxr_cdata( $str ) {
 246          $str = (string) $str;
 247  
 248          if ( ! wp_is_valid_utf8( $str ) ) {
 249              $str = utf8_encode( $str );
 250          }
 251          // $str = ent2ncr(esc_html($str));
 252          $str = '<![CDATA[' . str_replace( ']]>', ']]]]><![CDATA[>', $str ) . ']]>';
 253  
 254          return $str;
 255      }
 256  
 257      /**
 258       * Returns the URL of the site.
 259       *
 260       * @since 2.5.0
 261       *
 262       * @return string Site URL.
 263       */
 264  	function wxr_site_url() {
 265          if ( is_multisite() ) {
 266              // Multisite: the base URL.
 267              return network_home_url();
 268          } else {
 269              // WordPress (single site): the site URL.
 270              return get_bloginfo_rss( 'url' );
 271          }
 272      }
 273  
 274      /**
 275       * Outputs a cat_name XML tag from a given category object.
 276       *
 277       * @since 2.1.0
 278       *
 279       * @param WP_Term $category Category Object.
 280       */
 281  	function wxr_cat_name( $category ) {
 282          if ( empty( $category->name ) ) {
 283              return;
 284          }
 285  
 286          echo '<wp:cat_name>' . wxr_cdata( $category->name ) . "</wp:cat_name>\n";
 287      }
 288  
 289      /**
 290       * Outputs a category_description XML tag from a given category object.
 291       *
 292       * @since 2.1.0
 293       *
 294       * @param WP_Term $category Category Object.
 295       */
 296  	function wxr_category_description( $category ) {
 297          if ( empty( $category->description ) ) {
 298              return;
 299          }
 300  
 301          echo '<wp:category_description>' . wxr_cdata( $category->description ) . "</wp:category_description>\n";
 302      }
 303  
 304      /**
 305       * Outputs a tag_name XML tag from a given tag object.
 306       *
 307       * @since 2.3.0
 308       *
 309       * @param WP_Term $tag Tag Object.
 310       */
 311  	function wxr_tag_name( $tag ) {
 312          if ( empty( $tag->name ) ) {
 313              return;
 314          }
 315  
 316          echo '<wp:tag_name>' . wxr_cdata( $tag->name ) . "</wp:tag_name>\n";
 317      }
 318  
 319      /**
 320       * Outputs a tag_description XML tag from a given tag object.
 321       *
 322       * @since 2.3.0
 323       *
 324       * @param WP_Term $tag Tag Object.
 325       */
 326  	function wxr_tag_description( $tag ) {
 327          if ( empty( $tag->description ) ) {
 328              return;
 329          }
 330  
 331          echo '<wp:tag_description>' . wxr_cdata( $tag->description ) . "</wp:tag_description>\n";
 332      }
 333  
 334      /**
 335       * Outputs a term_name XML tag from a given term object.
 336       *
 337       * @since 2.9.0
 338       *
 339       * @param WP_Term $term Term Object.
 340       */
 341  	function wxr_term_name( $term ) {
 342          if ( empty( $term->name ) ) {
 343              return;
 344          }
 345  
 346          echo '<wp:term_name>' . wxr_cdata( $term->name ) . "</wp:term_name>\n";
 347      }
 348  
 349      /**
 350       * Outputs a term_description XML tag from a given term object.
 351       *
 352       * @since 2.9.0
 353       *
 354       * @param WP_Term $term Term Object.
 355       */
 356  	function wxr_term_description( $term ) {
 357          if ( empty( $term->description ) ) {
 358              return;
 359          }
 360  
 361          echo "\t\t<wp:term_description>" . wxr_cdata( $term->description ) . "</wp:term_description>\n";
 362      }
 363  
 364      /**
 365       * Outputs term meta XML tags for a given term object.
 366       *
 367       * @since 4.6.0
 368       *
 369       * @global wpdb $wpdb WordPress database abstraction object.
 370       *
 371       * @param WP_Term $term Term object.
 372       */
 373  	function wxr_term_meta( $term ) {
 374          global $wpdb;
 375  
 376          $termmeta = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->termmeta WHERE term_id = %d", $term->term_id ) );
 377  
 378          foreach ( $termmeta as $meta ) {
 379              /**
 380               * Filters whether to selectively skip term meta used for WXR exports.
 381               *
 382               * Returning a truthy value from the filter will skip the current meta
 383               * object from being exported.
 384               *
 385               * @since 4.6.0
 386               *
 387               * @param bool   $skip     Whether to skip the current piece of term meta. Default false.
 388               * @param string $meta_key Current meta key.
 389               * @param object $meta     Current meta object.
 390               */
 391              if ( ! apply_filters( 'wxr_export_skip_termmeta', false, $meta->meta_key, $meta ) ) {
 392                  printf( "\t\t<wp:termmeta>\n\t\t\t<wp:meta_key>%s</wp:meta_key>\n\t\t\t<wp:meta_value>%s</wp:meta_value>\n\t\t</wp:termmeta>\n", wxr_cdata( $meta->meta_key ), wxr_cdata( $meta->meta_value ) );
 393              }
 394          }
 395      }
 396  
 397      /**
 398       * Outputs list of authors with posts.
 399       *
 400       * @since 3.1.0
 401       *
 402       * @global wpdb $wpdb WordPress database abstraction object.
 403       *
 404       * @param int[] $post_ids Optional. Array of post IDs to filter the query by.
 405       */
 406  	function wxr_authors_list( ?array $post_ids = null ) {
 407          global $wpdb;
 408  
 409          if ( ! empty( $post_ids ) ) {
 410              $post_ids       = array_map( 'absint', $post_ids );
 411              $post_id_chunks = array_chunk( $post_ids, 20 );
 412          } else {
 413              $post_id_chunks = array( array() );
 414          }
 415  
 416          $authors = array();
 417  
 418          foreach ( $post_id_chunks as $next_posts ) {
 419              $and = ! empty( $next_posts ) ? 'AND ID IN (' . implode( ', ', $next_posts ) . ')' : '';
 420  
 421              $results = $wpdb->get_results( "SELECT DISTINCT post_author FROM $wpdb->posts WHERE post_status != 'auto-draft' $and" );
 422  
 423              foreach ( (array) $results as $result ) {
 424                  $authors[] = get_userdata( $result->post_author );
 425              }
 426          }
 427  
 428          $authors = array_filter( $authors );
 429          $authors = array_unique( $authors, SORT_REGULAR ); // Remove duplicate authors.
 430  
 431          foreach ( $authors as $author ) {
 432              echo "\t<wp:author>";
 433              echo '<wp:author_id>' . (int) $author->ID . '</wp:author_id>';
 434              echo '<wp:author_login>' . wxr_cdata( $author->user_login ) . '</wp:author_login>';
 435              echo '<wp:author_email>' . wxr_cdata( $author->user_email ) . '</wp:author_email>';
 436              echo '<wp:author_display_name>' . wxr_cdata( $author->display_name ) . '</wp:author_display_name>';
 437              echo '<wp:author_first_name>' . wxr_cdata( $author->first_name ) . '</wp:author_first_name>';
 438              echo '<wp:author_last_name>' . wxr_cdata( $author->last_name ) . '</wp:author_last_name>';
 439              echo "</wp:author>\n";
 440          }
 441      }
 442  
 443      /**
 444       * Outputs all navigation menu terms.
 445       *
 446       * @since 3.1.0
 447       */
 448  	function wxr_nav_menu_terms() {
 449          $nav_menus = wp_get_nav_menus();
 450          if ( empty( $nav_menus ) || ! is_array( $nav_menus ) ) {
 451              return;
 452          }
 453  
 454          foreach ( $nav_menus as $menu ) {
 455              echo "\t<wp:term>";
 456              echo '<wp:term_id>' . (int) $menu->term_id . '</wp:term_id>';
 457              echo '<wp:term_taxonomy>nav_menu</wp:term_taxonomy>';
 458              echo '<wp:term_slug>' . wxr_cdata( $menu->slug ) . '</wp:term_slug>';
 459              wxr_term_name( $menu );
 460              echo "</wp:term>\n";
 461          }
 462      }
 463  
 464      /**
 465       * Outputs list of taxonomy terms, in XML tag format, associated with a post.
 466       *
 467       * @since 2.3.0
 468       */
 469  	function wxr_post_taxonomy() {
 470          $post = get_post();
 471  
 472          $taxonomies = get_object_taxonomies( $post->post_type );
 473          if ( empty( $taxonomies ) ) {
 474              return;
 475          }
 476          $terms = wp_get_object_terms( $post->ID, $taxonomies );
 477  
 478          foreach ( (array) $terms as $term ) {
 479              echo "\t\t<category domain=\"{$term->taxonomy}\" nicename=\"{$term->slug}\">" . wxr_cdata( $term->name ) . "</category>\n";
 480          }
 481      }
 482  
 483      /**
 484       * Determines whether to selectively skip post meta used for WXR exports.
 485       *
 486       * @since 3.3.0
 487       *
 488       * @param bool   $return_me Whether to skip the current post meta. Default false.
 489       * @param string $meta_key  Meta key.
 490       * @return bool
 491       */
 492  	function wxr_filter_postmeta( $return_me, $meta_key ) {
 493          if ( '_edit_lock' === $meta_key ) {
 494              $return_me = true;
 495          }
 496          return $return_me;
 497      }
 498      add_filter( 'wxr_export_skip_postmeta', 'wxr_filter_postmeta', 10, 2 );
 499  
 500      echo '<?xml version="1.0" encoding="' . get_bloginfo( 'charset' ) . "\" ?>\n";
 501  
 502      ?>
 503  <!-- This is a WordPress eXtended RSS file generated by WordPress as an export of your site. -->
 504  <!-- It contains information about your site's posts, pages, comments, categories, and other content. -->
 505  <!-- You may use this file to transfer that content from one site to another. -->
 506  <!-- This file is not intended to serve as a complete backup of your site. -->
 507  
 508  <!-- To import this information into a WordPress site follow these steps: -->
 509  <!-- 1. Log in to that site as an administrator. -->
 510  <!-- 2. Go to Tools: Import in the WordPress admin panel. -->
 511  <!-- 3. Install the "WordPress" importer from the list. -->
 512  <!-- 4. Activate & Run Importer. -->
 513  <!-- 5. Upload this file using the form provided on that page. -->
 514  <!-- 6. You will first be asked to map the authors in this export file to users -->
 515  <!--    on the site. For each author, you may choose to map to an -->
 516  <!--    existing user on the site or to create a new user. -->
 517  <!-- 7. WordPress will then import each of the posts, pages, comments, categories, etc. -->
 518  <!--    contained in this file into your site. -->
 519  
 520      <?php the_generator( 'export' ); ?>
 521  <rss version="2.0"
 522      xmlns:excerpt="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/excerpt/"
 523      xmlns:content="http://purl.org/rss/1.0/modules/content/"
 524      xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 525      xmlns:dc="http://purl.org/dc/elements/1.1/"
 526      xmlns:wp="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/"
 527  >
 528  
 529  <channel>
 530      <title><?php bloginfo_rss( 'name' ); ?></title>
 531      <link><?php bloginfo_rss( 'url' ); ?></link>
 532      <description><?php bloginfo_rss( 'description' ); ?></description>
 533      <pubDate><?php echo gmdate( 'D, d M Y H:i:s +0000' ); ?></pubDate>
 534      <language><?php bloginfo_rss( 'language' ); ?></language>
 535      <wp:wxr_version><?php echo WXR_VERSION; ?></wp:wxr_version>
 536      <wp:base_site_url><?php echo wxr_site_url(); ?></wp:base_site_url>
 537      <wp:base_blog_url><?php bloginfo_rss( 'url' ); ?></wp:base_blog_url>
 538  
 539      <?php wxr_authors_list( $post_ids ); ?>
 540  
 541      <?php foreach ( $cats as $c ) : ?>
 542      <wp:category>
 543          <wp:term_id><?php echo (int) $c->term_id; ?></wp:term_id>
 544          <wp:category_nicename><?php echo wxr_cdata( $c->slug ); ?></wp:category_nicename>
 545          <wp:category_parent><?php echo wxr_cdata( $c->parent ? $cats[ $c->parent ]->slug : '' ); ?></wp:category_parent>
 546          <?php
 547          wxr_cat_name( $c );
 548          wxr_category_description( $c );
 549          wxr_term_meta( $c );
 550          ?>
 551      </wp:category>
 552      <?php endforeach; ?>
 553      <?php foreach ( $tags as $t ) : ?>
 554      <wp:tag>
 555          <wp:term_id><?php echo (int) $t->term_id; ?></wp:term_id>
 556          <wp:tag_slug><?php echo wxr_cdata( $t->slug ); ?></wp:tag_slug>
 557          <?php
 558          wxr_tag_name( $t );
 559          wxr_tag_description( $t );
 560          wxr_term_meta( $t );
 561          ?>
 562      </wp:tag>
 563      <?php endforeach; ?>
 564      <?php foreach ( $terms as $t ) : ?>
 565      <wp:term>
 566          <wp:term_id><?php echo (int) $t->term_id; ?></wp:term_id>
 567          <wp:term_taxonomy><?php echo wxr_cdata( $t->taxonomy ); ?></wp:term_taxonomy>
 568          <wp:term_slug><?php echo wxr_cdata( $t->slug ); ?></wp:term_slug>
 569          <wp:term_parent><?php echo wxr_cdata( $t->parent ? $terms[ $t->parent ]->slug : '' ); ?></wp:term_parent>
 570          <?php
 571          wxr_term_name( $t );
 572          wxr_term_description( $t );
 573          wxr_term_meta( $t );
 574          ?>
 575      </wp:term>
 576      <?php endforeach; ?>
 577      <?php
 578      if ( 'all' === $args['content'] ) {
 579          wxr_nav_menu_terms();
 580      }
 581      ?>
 582  
 583      <?php
 584      /** This action is documented in wp-includes/feed-rss2.php */
 585      do_action( 'rss2_head' );
 586      ?>
 587  
 588      <?php
 589      if ( $post_ids ) {
 590          /**
 591           * @global WP_Query $wp_query WordPress Query object.
 592           */
 593          global $wp_query;
 594  
 595          // Fake being in the loop.
 596          $wp_query->in_the_loop = true;
 597  
 598          // Fetch 20 posts at a time rather than loading the entire table into memory.
 599          while ( $next_posts = array_splice( $post_ids, 0, 20 ) ) {
 600              $where = 'WHERE ID IN (' . implode( ',', $next_posts ) . ')';
 601              $posts = $wpdb->get_results( "SELECT * FROM {$wpdb->posts} $where" );
 602  
 603              // Begin Loop.
 604              foreach ( $posts as $post ) {
 605                  setup_postdata( $post );
 606  
 607                  /**
 608                   * Filters the post title used for WXR exports.
 609                   *
 610                   * @since 5.7.0
 611                   *
 612                   * @param string $post_title Title of the current post.
 613                   */
 614                  $title = wxr_cdata( apply_filters( 'the_title_export', $post->post_title ) );
 615  
 616                  /**
 617                   * Filters the post content used for WXR exports.
 618                   *
 619                   * @since 2.5.0
 620                   *
 621                   * @param string $post_content Content of the current post.
 622                   */
 623                  $content = wxr_cdata( apply_filters( 'the_content_export', $post->post_content ) );
 624  
 625                  /**
 626                   * Filters the post excerpt used for WXR exports.
 627                   *
 628                   * @since 2.6.0
 629                   *
 630                   * @param string $post_excerpt Excerpt for the current post.
 631                   */
 632                  $excerpt = wxr_cdata( apply_filters( 'the_excerpt_export', $post->post_excerpt ) );
 633  
 634                  $is_sticky = is_sticky( $post->ID ) ? 1 : 0;
 635                  ?>
 636      <item>
 637          <title><?php echo $title; ?></title>
 638          <link><?php the_permalink_rss(); ?></link>
 639          <pubDate><?php echo mysql2date( 'D, d M Y H:i:s +0000', get_post_time( 'Y-m-d H:i:s', true ), false ); ?></pubDate>
 640          <dc:creator><?php echo wxr_cdata( get_the_author_meta( 'login' ) ); ?></dc:creator>
 641          <guid isPermaLink="false"><?php the_guid(); ?></guid>
 642          <description></description>
 643          <content:encoded><?php echo $content; ?></content:encoded>
 644          <excerpt:encoded><?php echo $excerpt; ?></excerpt:encoded>
 645          <wp:post_id><?php echo (int) $post->ID; ?></wp:post_id>
 646          <wp:post_date><?php echo wxr_cdata( $post->post_date ); ?></wp:post_date>
 647          <wp:post_date_gmt><?php echo wxr_cdata( $post->post_date_gmt ); ?></wp:post_date_gmt>
 648          <wp:post_modified><?php echo wxr_cdata( $post->post_modified ); ?></wp:post_modified>
 649          <wp:post_modified_gmt><?php echo wxr_cdata( $post->post_modified_gmt ); ?></wp:post_modified_gmt>
 650          <wp:comment_status><?php echo wxr_cdata( $post->comment_status ); ?></wp:comment_status>
 651          <wp:ping_status><?php echo wxr_cdata( $post->ping_status ); ?></wp:ping_status>
 652          <wp:post_name><?php echo wxr_cdata( $post->post_name ); ?></wp:post_name>
 653          <wp:status><?php echo wxr_cdata( $post->post_status ); ?></wp:status>
 654          <wp:post_parent><?php echo (int) $post->post_parent; ?></wp:post_parent>
 655          <wp:menu_order><?php echo (int) $post->menu_order; ?></wp:menu_order>
 656          <wp:post_type><?php echo wxr_cdata( $post->post_type ); ?></wp:post_type>
 657          <wp:post_password><?php echo wxr_cdata( $post->post_password ); ?></wp:post_password>
 658          <wp:is_sticky><?php echo (int) $is_sticky; ?></wp:is_sticky>
 659                  <?php    if ( 'attachment' === $post->post_type ) : ?>
 660          <wp:attachment_url><?php echo wxr_cdata( wp_get_attachment_url( $post->ID ) ); ?></wp:attachment_url>
 661      <?php endif; ?>
 662                  <?php wxr_post_taxonomy(); ?>
 663                  <?php
 664                  $postmeta = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->postmeta WHERE post_id = %d", $post->ID ) );
 665                  foreach ( $postmeta as $meta ) :
 666                      /**
 667                       * Filters whether to selectively skip post meta used for WXR exports.
 668                       *
 669                       * Returning a truthy value from the filter will skip the current meta
 670                       * object from being exported.
 671                       *
 672                       * @since 3.3.0
 673                       *
 674                       * @param bool   $skip     Whether to skip the current post meta. Default false.
 675                       * @param string $meta_key Current meta key.
 676                       * @param object $meta     Current meta object.
 677                       */
 678                      if ( apply_filters( 'wxr_export_skip_postmeta', false, $meta->meta_key, $meta ) ) {
 679                          continue;
 680                      }
 681                      ?>
 682          <wp:postmeta>
 683          <wp:meta_key><?php echo wxr_cdata( $meta->meta_key ); ?></wp:meta_key>
 684          <wp:meta_value><?php echo wxr_cdata( $meta->meta_value ); ?></wp:meta_value>
 685          </wp:postmeta>
 686                      <?php
 687      endforeach;
 688  
 689                  $_comments = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved <> 'spam'", $post->ID ) );
 690                  $comments  = array_filter(
 691                      array_map( 'get_comment', $_comments ),
 692                      static function ( $comment ) {
 693                          return $comment instanceof WP_Comment;
 694                      }
 695                  );
 696                  foreach ( $comments as $c ) :
 697                      ?>
 698          <wp:comment>
 699              <wp:comment_id><?php echo (int) $c->comment_ID; ?></wp:comment_id>
 700              <wp:comment_author><?php echo wxr_cdata( $c->comment_author ); ?></wp:comment_author>
 701              <wp:comment_author_email><?php echo wxr_cdata( $c->comment_author_email ); ?></wp:comment_author_email>
 702              <wp:comment_author_url><?php echo sanitize_url( $c->comment_author_url ); ?></wp:comment_author_url>
 703              <wp:comment_author_IP><?php echo wxr_cdata( $c->comment_author_IP ); ?></wp:comment_author_IP>
 704              <wp:comment_date><?php echo wxr_cdata( $c->comment_date ); ?></wp:comment_date>
 705              <wp:comment_date_gmt><?php echo wxr_cdata( $c->comment_date_gmt ); ?></wp:comment_date_gmt>
 706              <wp:comment_content><?php echo wxr_cdata( $c->comment_content ); ?></wp:comment_content>
 707              <wp:comment_approved><?php echo wxr_cdata( $c->comment_approved ); ?></wp:comment_approved>
 708              <wp:comment_type><?php echo wxr_cdata( $c->comment_type ); ?></wp:comment_type>
 709              <wp:comment_parent><?php echo (int) $c->comment_parent; ?></wp:comment_parent>
 710              <wp:comment_user_id><?php echo (int) $c->user_id; ?></wp:comment_user_id>
 711                      <?php
 712                      $c_meta = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->commentmeta WHERE comment_id = %d", $c->comment_ID ) );
 713                      foreach ( $c_meta as $meta ) :
 714                          /**
 715                           * Filters whether to selectively skip comment meta used for WXR exports.
 716                           *
 717                           * Returning a truthy value from the filter will skip the current meta
 718                           * object from being exported.
 719                           *
 720                           * @since 4.0.0
 721                           *
 722                           * @param bool   $skip     Whether to skip the current comment meta. Default false.
 723                           * @param string $meta_key Current meta key.
 724                           * @param object $meta     Current meta object.
 725                           */
 726                          if ( apply_filters( 'wxr_export_skip_commentmeta', false, $meta->meta_key, $meta ) ) {
 727                              continue;
 728                          }
 729                          ?>
 730      <wp:commentmeta>
 731      <wp:meta_key><?php echo wxr_cdata( $meta->meta_key ); ?></wp:meta_key>
 732              <wp:meta_value><?php echo wxr_cdata( $meta->meta_value ); ?></wp:meta_value>
 733              </wp:commentmeta>
 734                      <?php    endforeach; ?>
 735          </wp:comment>
 736              <?php    endforeach; ?>
 737          </item>
 738                  <?php
 739              }
 740          }
 741      }
 742      ?>
 743  </channel>
 744  </rss>
 745      <?php
 746  }