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

   1  <?php
   2  /**
   3   * Post revision functions.
   4   *
   5   * @package WordPress
   6   * @subpackage Post_Revisions
   7   */
   8  
   9  /**
  10   * Determines which fields of posts are to be saved in revisions.
  11   *
  12   * @since 2.6.0
  13   * @since 4.5.0 A `WP_Post` object can now be passed to the `$post` parameter.
  14   * @since 4.5.0 The optional `$autosave` parameter was deprecated and renamed to `$deprecated`.
  15   * @access private
  16   *
  17   * @staticvar array $fields
  18   *
  19   * @param array|WP_Post $post       Optional. A post array or a WP_Post object being processed
  20   *                                  for insertion as a post revision. Default empty array.
  21   * @param bool          $deprecated Not used.
  22   * @return array Array of fields that can be versioned.
  23   */
  24  function _wp_post_revision_fields( $post = array(), $deprecated = false ) {
  25      static $fields = null;
  26  
  27      if ( ! is_array( $post ) ) {
  28          $post = get_post( $post, ARRAY_A );
  29      }
  30  
  31      if ( is_null( $fields ) ) {
  32          // Allow these to be versioned
  33          $fields = array(
  34              'post_title'   => __( 'Title' ),
  35              'post_content' => __( 'Content' ),
  36              'post_excerpt' => __( 'Excerpt' ),
  37          );
  38      }
  39  
  40      /**
  41       * Filters the list of fields saved in post revisions.
  42       *
  43       * Included by default: 'post_title', 'post_content' and 'post_excerpt'.
  44       *
  45       * Disallowed fields: 'ID', 'post_name', 'post_parent', 'post_date',
  46       * 'post_date_gmt', 'post_status', 'post_type', 'comment_count',
  47       * and 'post_author'.
  48       *
  49       * @since 2.6.0
  50       * @since 4.5.0 The `$post` parameter was added.
  51       *
  52       * @param array $fields List of fields to revision. Contains 'post_title',
  53       *                      'post_content', and 'post_excerpt' by default.
  54       * @param array $post   A post array being processed for insertion as a post revision.
  55       */
  56      $fields = apply_filters( '_wp_post_revision_fields', $fields, $post );
  57  
  58      // WP uses these internally either in versioning or elsewhere - they cannot be versioned
  59      foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) {
  60          unset( $fields[ $protect ] );
  61      }
  62  
  63      return $fields;
  64  }
  65  
  66  /**
  67   * Returns a post array ready to be inserted into the posts table as a post revision.
  68   *
  69   * @since 4.5.0
  70   * @access private
  71   *
  72   * @param array|WP_Post $post     Optional. A post array or a WP_Post object to be processed
  73   *                                for insertion as a post revision. Default empty array.
  74   * @param bool          $autosave Optional. Is the revision an autosave? Default false.
  75   * @return array Post array ready to be inserted as a post revision.
  76   */
  77  function _wp_post_revision_data( $post = array(), $autosave = false ) {
  78      if ( ! is_array( $post ) ) {
  79          $post = get_post( $post, ARRAY_A );
  80      }
  81  
  82      $fields = _wp_post_revision_fields( $post );
  83  
  84      $revision_data = array();
  85  
  86      foreach ( array_intersect( array_keys( $post ), array_keys( $fields ) ) as $field ) {
  87          $revision_data[ $field ] = $post[ $field ];
  88      }
  89  
  90      $revision_data['post_parent']   = $post['ID'];
  91      $revision_data['post_status']   = 'inherit';
  92      $revision_data['post_type']     = 'revision';
  93      $revision_data['post_name']     = $autosave ? "$post[ID]-autosave-v1" : "$post[ID]-revision-v1"; // "1" is the revisioning system version
  94      $revision_data['post_date']     = isset( $post['post_modified'] ) ? $post['post_modified'] : '';
  95      $revision_data['post_date_gmt'] = isset( $post['post_modified_gmt'] ) ? $post['post_modified_gmt'] : '';
  96  
  97      return $revision_data;
  98  }
  99  
 100  /**
 101   * Creates a revision for the current version of a post.
 102   *
 103   * Typically used immediately after a post update, as every update is a revision,
 104   * and the most recent revision always matches the current post.
 105   *
 106   * @since 2.6.0
 107   *
 108   * @param int $post_id The ID of the post to save as a revision.
 109   * @return int|WP_Error|void Void or 0 if error, new revision ID, if success.
 110   */
 111  function wp_save_post_revision( $post_id ) {
 112      if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
 113          return;
 114      }
 115  
 116      if ( ! $post = get_post( $post_id ) ) {
 117          return;
 118      }
 119  
 120      if ( ! post_type_supports( $post->post_type, 'revisions' ) ) {
 121          return;
 122      }
 123  
 124      if ( 'auto-draft' == $post->post_status ) {
 125          return;
 126      }
 127  
 128      if ( ! wp_revisions_enabled( $post ) ) {
 129          return;
 130      }
 131  
 132      // Compare the proposed update with the last stored revision verifying that
 133      // they are different, unless a plugin tells us to always save regardless.
 134      // If no previous revisions, save one
 135      if ( $revisions = wp_get_post_revisions( $post_id ) ) {
 136          // grab the last revision, but not an autosave
 137          foreach ( $revisions as $revision ) {
 138              if ( false !== strpos( $revision->post_name, "{$revision->post_parent}-revision" ) ) {
 139                  $last_revision = $revision;
 140                  break;
 141              }
 142          }
 143  
 144          /**
 145           * Filters whether the post has changed since the last revision.
 146           *
 147           * By default a revision is saved only if one of the revisioned fields has changed.
 148           * This filter can override that so a revision is saved even if nothing has changed.
 149           *
 150           * @since 3.6.0
 151           *
 152           * @param bool    $check_for_changes Whether to check for changes before saving a new revision.
 153           *                                   Default true.
 154           * @param WP_Post $last_revision     The last revision post object.
 155           * @param WP_Post $post              The post object.
 156           */
 157          if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', $check_for_changes = true, $last_revision, $post ) ) {
 158              $post_has_changed = false;
 159  
 160              foreach ( array_keys( _wp_post_revision_fields( $post ) ) as $field ) {
 161                  if ( normalize_whitespace( $post->$field ) != normalize_whitespace( $last_revision->$field ) ) {
 162                      $post_has_changed = true;
 163                      break;
 164                  }
 165              }
 166  
 167              /**
 168               * Filters whether a post has changed.
 169               *
 170               * By default a revision is saved only if one of the revisioned fields has changed.
 171               * This filter allows for additional checks to determine if there were changes.
 172               *
 173               * @since 4.1.0
 174               *
 175               * @param bool    $post_has_changed Whether the post has changed.
 176               * @param WP_Post $last_revision    The last revision post object.
 177               * @param WP_Post $post             The post object.
 178               */
 179              $post_has_changed = (bool) apply_filters( 'wp_save_post_revision_post_has_changed', $post_has_changed, $last_revision, $post );
 180  
 181              //don't save revision if post unchanged
 182              if ( ! $post_has_changed ) {
 183                  return;
 184              }
 185          }
 186      }
 187  
 188      $return = _wp_put_post_revision( $post );
 189  
 190      // If a limit for the number of revisions to keep has been set,
 191      // delete the oldest ones.
 192      $revisions_to_keep = wp_revisions_to_keep( $post );
 193  
 194      if ( $revisions_to_keep < 0 ) {
 195          return $return;
 196      }
 197  
 198      $revisions = wp_get_post_revisions( $post_id, array( 'order' => 'ASC' ) );
 199  
 200      $delete = count( $revisions ) - $revisions_to_keep;
 201  
 202      if ( $delete < 1 ) {
 203          return $return;
 204      }
 205  
 206      $revisions = array_slice( $revisions, 0, $delete );
 207  
 208      for ( $i = 0; isset( $revisions[ $i ] ); $i++ ) {
 209          if ( false !== strpos( $revisions[ $i ]->post_name, 'autosave' ) ) {
 210              continue;
 211          }
 212  
 213          wp_delete_post_revision( $revisions[ $i ]->ID );
 214      }
 215  
 216      return $return;
 217  }
 218  
 219  /**
 220   * Retrieve the autosaved data of the specified post.
 221   *
 222   * Returns a post object containing the information that was autosaved for the
 223   * specified post. If the optional $user_id is passed, returns the autosave for that user
 224   * otherwise returns the latest autosave.
 225   *
 226   * @since 2.6.0
 227   *
 228   * @param int $post_id The post ID.
 229   * @param int $user_id Optional The post author ID.
 230   * @return WP_Post|false The autosaved data or false on failure or when no autosave exists.
 231   */
 232  function wp_get_post_autosave( $post_id, $user_id = 0 ) {
 233      $revisions = wp_get_post_revisions( $post_id, array( 'check_enabled' => false ) );
 234  
 235      foreach ( $revisions as $revision ) {
 236          if ( false !== strpos( $revision->post_name, "{$post_id}-autosave" ) ) {
 237              if ( $user_id && $user_id != $revision->post_author ) {
 238                  continue;
 239              }
 240  
 241              return $revision;
 242          }
 243      }
 244  
 245      return false;
 246  }
 247  
 248  /**
 249   * Determines if the specified post is a revision.
 250   *
 251   * @since 2.6.0
 252   *
 253   * @param int|WP_Post $post Post ID or post object.
 254   * @return false|int False if not a revision, ID of revision's parent otherwise.
 255   */
 256  function wp_is_post_revision( $post ) {
 257      if ( ! $post = wp_get_post_revision( $post ) ) {
 258          return false;
 259      }
 260  
 261      return (int) $post->post_parent;
 262  }
 263  
 264  /**
 265   * Determines if the specified post is an autosave.
 266   *
 267   * @since 2.6.0
 268   *
 269   * @param int|WP_Post $post Post ID or post object.
 270   * @return false|int False if not a revision, ID of autosave's parent otherwise
 271   */
 272  function wp_is_post_autosave( $post ) {
 273      if ( ! $post = wp_get_post_revision( $post ) ) {
 274          return false;
 275      }
 276  
 277      if ( false !== strpos( $post->post_name, "{$post->post_parent}-autosave" ) ) {
 278          return (int) $post->post_parent;
 279      }
 280  
 281      return false;
 282  }
 283  
 284  /**
 285   * Inserts post data into the posts table as a post revision.
 286   *
 287   * @since 2.6.0
 288   * @access private
 289   *
 290   * @param int|WP_Post|array|null $post     Post ID, post object OR post array.
 291   * @param bool                   $autosave Optional. Is the revision an autosave?
 292   * @return int|WP_Error WP_Error or 0 if error, new revision ID if success.
 293   */
 294  function _wp_put_post_revision( $post = null, $autosave = false ) {
 295      if ( is_object( $post ) ) {
 296          $post = get_object_vars( $post );
 297      } elseif ( ! is_array( $post ) ) {
 298          $post = get_post( $post, ARRAY_A );
 299      }
 300  
 301      if ( ! $post || empty( $post['ID'] ) ) {
 302          return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
 303      }
 304  
 305      if ( isset( $post['post_type'] ) && 'revision' == $post['post_type'] ) {
 306          return new WP_Error( 'post_type', __( 'Cannot create a revision of a revision' ) );
 307      }
 308  
 309      $post = _wp_post_revision_data( $post, $autosave );
 310      $post = wp_slash( $post ); //since data is from db
 311  
 312      $revision_id = wp_insert_post( $post );
 313      if ( is_wp_error( $revision_id ) ) {
 314          return $revision_id;
 315      }
 316  
 317      if ( $revision_id ) {
 318          /**
 319           * Fires once a revision has been saved.
 320           *
 321           * @since 2.6.0
 322           *
 323           * @param int $revision_id Post revision ID.
 324           */
 325          do_action( '_wp_put_post_revision', $revision_id );
 326      }
 327  
 328      return $revision_id;
 329  }
 330  
 331  /**
 332   * Gets a post revision.
 333   *
 334   * @since 2.6.0
 335   *
 336   * @param int|WP_Post $post   The post ID or object.
 337   * @param string      $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 338   *                            a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 339   * @param string      $filter Optional sanitation filter. See sanitize_post().
 340   * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 341   */
 342  function wp_get_post_revision( &$post, $output = OBJECT, $filter = 'raw' ) {
 343      if ( ! $revision = get_post( $post, OBJECT, $filter ) ) {
 344          return $revision;
 345      }
 346      if ( 'revision' !== $revision->post_type ) {
 347          return null;
 348      }
 349  
 350      if ( $output == OBJECT ) {
 351          return $revision;
 352      } elseif ( $output == ARRAY_A ) {
 353          $_revision = get_object_vars( $revision );
 354          return $_revision;
 355      } elseif ( $output == ARRAY_N ) {
 356          $_revision = array_values( get_object_vars( $revision ) );
 357          return $_revision;
 358      }
 359  
 360      return $revision;
 361  }
 362  
 363  /**
 364   * Restores a post to the specified revision.
 365   *
 366   * Can restore a past revision using all fields of the post revision, or only selected fields.
 367   *
 368   * @since 2.6.0
 369   *
 370   * @param int|WP_Post $revision_id Revision ID or revision object.
 371   * @param array       $fields      Optional. What fields to restore from. Defaults to all.
 372   * @return int|false|null Null if error, false if no fields to restore, (int) post ID if success.
 373   */
 374  function wp_restore_post_revision( $revision_id, $fields = null ) {
 375      if ( ! $revision = wp_get_post_revision( $revision_id, ARRAY_A ) ) {
 376          return $revision;
 377      }
 378  
 379      if ( ! is_array( $fields ) ) {
 380          $fields = array_keys( _wp_post_revision_fields( $revision ) );
 381      }
 382  
 383      $update = array();
 384      foreach ( array_intersect( array_keys( $revision ), $fields ) as $field ) {
 385          $update[ $field ] = $revision[ $field ];
 386      }
 387  
 388      if ( ! $update ) {
 389          return false;
 390      }
 391  
 392      $update['ID'] = $revision['post_parent'];
 393  
 394      $update = wp_slash( $update ); //since data is from db
 395  
 396      $post_id = wp_update_post( $update );
 397      if ( ! $post_id || is_wp_error( $post_id ) ) {
 398          return $post_id;
 399      }
 400  
 401      // Update last edit user
 402      update_post_meta( $post_id, '_edit_last', get_current_user_id() );
 403  
 404      /**
 405       * Fires after a post revision has been restored.
 406       *
 407       * @since 2.6.0
 408       *
 409       * @param int $post_id     Post ID.
 410       * @param int $revision_id Post revision ID.
 411       */
 412      do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] );
 413  
 414      return $post_id;
 415  }
 416  
 417  /**
 418   * Deletes a revision.
 419   *
 420   * Deletes the row from the posts table corresponding to the specified revision.
 421   *
 422   * @since 2.6.0
 423   *
 424   * @param int|WP_Post $revision_id Revision ID or revision object.
 425   * @return array|false|WP_Post|WP_Error|null Null or WP_Error if error, deleted post if success.
 426   */
 427  function wp_delete_post_revision( $revision_id ) {
 428      if ( ! $revision = wp_get_post_revision( $revision_id ) ) {
 429          return $revision;
 430      }
 431  
 432      $delete = wp_delete_post( $revision->ID );
 433      if ( $delete ) {
 434          /**
 435           * Fires once a post revision has been deleted.
 436           *
 437           * @since 2.6.0
 438           *
 439           * @param int          $revision_id Post revision ID.
 440           * @param object|array $revision    Post revision object or array.
 441           */
 442          do_action( 'wp_delete_post_revision', $revision->ID, $revision );
 443      }
 444  
 445      return $delete;
 446  }
 447  
 448  /**
 449   * Returns all revisions of specified post.
 450   *
 451   * @since 2.6.0
 452   *
 453   * @see get_children()
 454   *
 455   * @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is global `$post`.
 456   * @param array|null  $args    Optional. Arguments for retrieving post revisions. Default null.
 457   * @return array An array of revisions, or an empty array if none.
 458   */
 459  function wp_get_post_revisions( $post_id = 0, $args = null ) {
 460      $post = get_post( $post_id );
 461      if ( ! $post || empty( $post->ID ) ) {
 462          return array();
 463      }
 464  
 465      $defaults = array(
 466          'order'         => 'DESC',
 467          'orderby'       => 'date ID',
 468          'check_enabled' => true,
 469      );
 470      $args     = wp_parse_args( $args, $defaults );
 471  
 472      if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) ) {
 473          return array();
 474      }
 475  
 476      $args = array_merge(
 477          $args,
 478          array(
 479              'post_parent' => $post->ID,
 480              'post_type'   => 'revision',
 481              'post_status' => 'inherit',
 482          )
 483      );
 484  
 485      if ( ! $revisions = get_children( $args ) ) {
 486          return array();
 487      }
 488  
 489      return $revisions;
 490  }
 491  
 492  /**
 493   * Determine if revisions are enabled for a given post.
 494   *
 495   * @since 3.6.0
 496   *
 497   * @param WP_Post $post The post object.
 498   * @return bool True if number of revisions to keep isn't zero, false otherwise.
 499   */
 500  function wp_revisions_enabled( $post ) {
 501      return wp_revisions_to_keep( $post ) !== 0;
 502  }
 503  
 504  /**
 505   * Determine how many revisions to retain for a given post.
 506   *
 507   * By default, an infinite number of revisions are kept.
 508   *
 509   * The constant WP_POST_REVISIONS can be set in wp-config to specify the limit
 510   * of revisions to keep.
 511   *
 512   * @since 3.6.0
 513   *
 514   * @param WP_Post $post The post object.
 515   * @return int The number of revisions to keep.
 516   */
 517  function wp_revisions_to_keep( $post ) {
 518      $num = WP_POST_REVISIONS;
 519  
 520      if ( true === $num ) {
 521          $num = -1;
 522      } else {
 523          $num = intval( $num );
 524      }
 525  
 526      if ( ! post_type_supports( $post->post_type, 'revisions' ) ) {
 527          $num = 0;
 528      }
 529  
 530      /**
 531       * Filters the number of revisions to save for the given post.
 532       *
 533       * Overrides the value of WP_POST_REVISIONS.
 534       *
 535       * @since 3.6.0
 536       *
 537       * @param int     $num  Number of revisions to store.
 538       * @param WP_Post $post Post object.
 539       */
 540      return (int) apply_filters( 'wp_revisions_to_keep', $num, $post );
 541  }
 542  
 543  /**
 544   * Sets up the post object for preview based on the post autosave.
 545   *
 546   * @since 2.7.0
 547   * @access private
 548   *
 549   * @param WP_Post $post
 550   * @return WP_Post|false
 551   */
 552  function _set_preview( $post ) {
 553      if ( ! is_object( $post ) ) {
 554          return $post;
 555      }
 556  
 557      $preview = wp_get_post_autosave( $post->ID );
 558      if ( ! is_object( $preview ) ) {
 559          return $post;
 560      }
 561  
 562      $preview = sanitize_post( $preview );
 563  
 564      $post->post_content = $preview->post_content;
 565      $post->post_title   = $preview->post_title;
 566      $post->post_excerpt = $preview->post_excerpt;
 567  
 568      add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 );
 569      add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_filter', 10, 3 );
 570  
 571      return $post;
 572  }
 573  
 574  /**
 575   * Filters the latest content for preview from the post autosave.
 576   *
 577   * @since 2.7.0
 578   * @access private
 579   */
 580  function _show_post_preview() {
 581      if ( isset( $_GET['preview_id'] ) && isset( $_GET['preview_nonce'] ) ) {
 582          $id = (int) $_GET['preview_id'];
 583  
 584          if ( false === wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . $id ) ) {
 585              wp_die( __( 'Sorry, you are not allowed to preview drafts.' ), 403 );
 586          }
 587  
 588          add_filter( 'the_preview', '_set_preview' );
 589      }
 590  }
 591  
 592  /**
 593   * Filters terms lookup to set the post format.
 594   *
 595   * @since 3.6.0
 596   * @access private
 597   *
 598   * @param array  $terms
 599   * @param int    $post_id
 600   * @param string $taxonomy
 601   * @return array
 602   */
 603  function _wp_preview_terms_filter( $terms, $post_id, $taxonomy ) {
 604      if ( ! $post = get_post() ) {
 605          return $terms;
 606      }
 607  
 608      if ( empty( $_REQUEST['post_format'] ) || $post->ID != $post_id || 'post_format' != $taxonomy || 'revision' == $post->post_type ) {
 609          return $terms;
 610      }
 611  
 612      if ( 'standard' == $_REQUEST['post_format'] ) {
 613          $terms = array();
 614      } elseif ( $term = get_term_by( 'slug', 'post-format-' . sanitize_key( $_REQUEST['post_format'] ), 'post_format' ) ) {
 615          $terms = array( $term ); // Can only have one post format
 616      }
 617  
 618      return $terms;
 619  }
 620  
 621  /**
 622   * Filters post thumbnail lookup to set the post thumbnail.
 623   *
 624   * @since 4.6.0
 625   * @access private
 626   *
 627   * @param null|array|string $value    The value to return - a single metadata value, or an array of values.
 628   * @param int               $post_id  Post ID.
 629   * @param string            $meta_key Meta key.
 630   * @return null|array The default return value or the post thumbnail meta array.
 631   */
 632  function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) {
 633      if ( ! $post = get_post() ) {
 634          return $value;
 635      }
 636  
 637      if ( empty( $_REQUEST['_thumbnail_id'] ) ||
 638          empty( $_REQUEST['preview_id'] ) ||
 639          $post->ID != $post_id ||
 640          '_thumbnail_id' != $meta_key ||
 641          'revision' == $post->post_type ||
 642          $post_id != $_REQUEST['preview_id'] ) {
 643  
 644          return $value;
 645      }
 646  
 647      $thumbnail_id = intval( $_REQUEST['_thumbnail_id'] );
 648      if ( $thumbnail_id <= 0 ) {
 649          return '';
 650      }
 651  
 652      return strval( $thumbnail_id );
 653  }
 654  
 655  /**
 656   * Gets the post revision version.
 657   *
 658   * @since 3.6.0
 659   * @access private
 660   *
 661   * @param WP_Post $revision
 662   * @return int|false
 663   */
 664  function _wp_get_post_revision_version( $revision ) {
 665      if ( is_object( $revision ) ) {
 666          $revision = get_object_vars( $revision );
 667      } elseif ( ! is_array( $revision ) ) {
 668          return false;
 669      }
 670  
 671      if ( preg_match( '/^\d+-(?:autosave|revision)-v(\d+)$/', $revision['post_name'], $matches ) ) {
 672          return (int) $matches[1];
 673      }
 674  
 675      return 0;
 676  }
 677  
 678  /**
 679   * Upgrade the revisions author, add the current post as a revision and set the revisions version to 1
 680   *
 681   * @since 3.6.0
 682   * @access private
 683   *
 684   * @global wpdb $wpdb WordPress database abstraction object.
 685   *
 686   * @param WP_Post $post      Post object
 687   * @param array   $revisions Current revisions of the post
 688   * @return bool true if the revisions were upgraded, false if problems
 689   */
 690  function _wp_upgrade_revisions_of_post( $post, $revisions ) {
 691      global $wpdb;
 692  
 693      // Add post option exclusively
 694      $lock   = "revision-upgrade-{$post->ID}";
 695      $now    = time();
 696      $result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'no') /* LOCK */", $lock, $now ) );
 697      if ( ! $result ) {
 698          // If we couldn't get a lock, see how old the previous lock is
 699          $locked = get_option( $lock );
 700          if ( ! $locked ) {
 701              // Can't write to the lock, and can't read the lock.
 702              // Something broken has happened
 703              return false;
 704          }
 705  
 706          if ( $locked > $now - 3600 ) {
 707              // Lock is not too old: some other process may be upgrading this post.  Bail.
 708              return false;
 709          }
 710  
 711          // Lock is too old - update it (below) and continue
 712      }
 713  
 714      // If we could get a lock, re-"add" the option to fire all the correct filters.
 715      update_option( $lock, $now );
 716  
 717      reset( $revisions );
 718      $add_last = true;
 719  
 720      do {
 721          $this_revision = current( $revisions );
 722          $prev_revision = next( $revisions );
 723  
 724          $this_revision_version = _wp_get_post_revision_version( $this_revision );
 725  
 726          // Something terrible happened
 727          if ( false === $this_revision_version ) {
 728              continue;
 729          }
 730  
 731          // 1 is the latest revision version, so we're already up to date.
 732          // No need to add a copy of the post as latest revision.
 733          if ( 0 < $this_revision_version ) {
 734              $add_last = false;
 735              continue;
 736          }
 737  
 738          // Always update the revision version
 739          $update = array(
 740              'post_name' => preg_replace( '/^(\d+-(?:autosave|revision))[\d-]*$/', '$1-v1', $this_revision->post_name ),
 741          );
 742  
 743          // If this revision is the oldest revision of the post, i.e. no $prev_revision,
 744          // the correct post_author is probably $post->post_author, but that's only a good guess.
 745          // Update the revision version only and Leave the author as-is.
 746          if ( $prev_revision ) {
 747              $prev_revision_version = _wp_get_post_revision_version( $prev_revision );
 748  
 749              // If the previous revision is already up to date, it no longer has the information we need :(
 750              if ( $prev_revision_version < 1 ) {
 751                  $update['post_author'] = $prev_revision->post_author;
 752              }
 753          }
 754  
 755          // Upgrade this revision
 756          $result = $wpdb->update( $wpdb->posts, $update, array( 'ID' => $this_revision->ID ) );
 757  
 758          if ( $result ) {
 759              wp_cache_delete( $this_revision->ID, 'posts' );
 760          }
 761      } while ( $prev_revision );
 762  
 763      delete_option( $lock );
 764  
 765      // Add a copy of the post as latest revision.
 766      if ( $add_last ) {
 767          wp_save_post_revision( $post->ID );
 768      }
 769  
 770      return true;
 771  }


Generated: Mon Jun 24 08:20:01 2019 Cross-referenced by PHPXref 0.7