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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 $post = get_post( $post_id ); 117 if ( ! $post ) { 118 return; 119 } 120 121 if ( ! post_type_supports( $post->post_type, 'revisions' ) ) { 122 return; 123 } 124 125 if ( 'auto-draft' == $post->post_status ) { 126 return; 127 } 128 129 if ( ! wp_revisions_enabled( $post ) ) { 130 return; 131 } 132 133 // Compare the proposed update with the last stored revision verifying that 134 // they are different, unless a plugin tells us to always save regardless. 135 // If no previous revisions, save one 136 $revisions = wp_get_post_revisions( $post_id ); 137 if ( $revisions ) { 138 // grab the last revision, but not an autosave 139 foreach ( $revisions as $revision ) { 140 if ( false !== strpos( $revision->post_name, "{$revision->post_parent}-revision" ) ) { 141 $last_revision = $revision; 142 break; 143 } 144 } 145 146 /** 147 * Filters whether the post has changed since the last revision. 148 * 149 * By default a revision is saved only if one of the revisioned fields has changed. 150 * This filter can override that so a revision is saved even if nothing has changed. 151 * 152 * @since 3.6.0 153 * 154 * @param bool $check_for_changes Whether to check for changes before saving a new revision. 155 * Default true. 156 * @param WP_Post $last_revision The last revision post object. 157 * @param WP_Post $post The post object. 158 */ 159 if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $last_revision, $post ) ) { 160 $post_has_changed = false; 161 162 foreach ( array_keys( _wp_post_revision_fields( $post ) ) as $field ) { 163 if ( normalize_whitespace( $post->$field ) != normalize_whitespace( $last_revision->$field ) ) { 164 $post_has_changed = true; 165 break; 166 } 167 } 168 169 /** 170 * Filters whether a post has changed. 171 * 172 * By default a revision is saved only if one of the revisioned fields has changed. 173 * This filter allows for additional checks to determine if there were changes. 174 * 175 * @since 4.1.0 176 * 177 * @param bool $post_has_changed Whether the post has changed. 178 * @param WP_Post $last_revision The last revision post object. 179 * @param WP_Post $post The post object. 180 */ 181 $post_has_changed = (bool) apply_filters( 'wp_save_post_revision_post_has_changed', $post_has_changed, $last_revision, $post ); 182 183 //don't save revision if post unchanged 184 if ( ! $post_has_changed ) { 185 return; 186 } 187 } 188 } 189 190 $return = _wp_put_post_revision( $post ); 191 192 // If a limit for the number of revisions to keep has been set, 193 // delete the oldest ones. 194 $revisions_to_keep = wp_revisions_to_keep( $post ); 195 196 if ( $revisions_to_keep < 0 ) { 197 return $return; 198 } 199 200 $revisions = wp_get_post_revisions( $post_id, array( 'order' => 'ASC' ) ); 201 202 $delete = count( $revisions ) - $revisions_to_keep; 203 204 if ( $delete < 1 ) { 205 return $return; 206 } 207 208 $revisions = array_slice( $revisions, 0, $delete ); 209 210 for ( $i = 0; isset( $revisions[ $i ] ); $i++ ) { 211 if ( false !== strpos( $revisions[ $i ]->post_name, 'autosave' ) ) { 212 continue; 213 } 214 215 wp_delete_post_revision( $revisions[ $i ]->ID ); 216 } 217 218 return $return; 219 } 220 221 /** 222 * Retrieve the autosaved data of the specified post. 223 * 224 * Returns a post object containing the information that was autosaved for the 225 * specified post. If the optional $user_id is passed, returns the autosave for that user 226 * otherwise returns the latest autosave. 227 * 228 * @since 2.6.0 229 * 230 * @param int $post_id The post ID. 231 * @param int $user_id Optional The post author ID. 232 * @return WP_Post|false The autosaved data or false on failure or when no autosave exists. 233 */ 234 function wp_get_post_autosave( $post_id, $user_id = 0 ) { 235 $revisions = wp_get_post_revisions( $post_id, array( 'check_enabled' => false ) ); 236 237 foreach ( $revisions as $revision ) { 238 if ( false !== strpos( $revision->post_name, "{$post_id}-autosave" ) ) { 239 if ( $user_id && $user_id != $revision->post_author ) { 240 continue; 241 } 242 243 return $revision; 244 } 245 } 246 247 return false; 248 } 249 250 /** 251 * Determines if the specified post is a revision. 252 * 253 * @since 2.6.0 254 * 255 * @param int|WP_Post $post Post ID or post object. 256 * @return false|int False if not a revision, ID of revision's parent otherwise. 257 */ 258 function wp_is_post_revision( $post ) { 259 $post = wp_get_post_revision( $post ); 260 if ( ! $post ) { 261 return false; 262 } 263 264 return (int) $post->post_parent; 265 } 266 267 /** 268 * Determines if the specified post is an autosave. 269 * 270 * @since 2.6.0 271 * 272 * @param int|WP_Post $post Post ID or post object. 273 * @return false|int False if not a revision, ID of autosave's parent otherwise 274 */ 275 function wp_is_post_autosave( $post ) { 276 $post = wp_get_post_revision( $post ); 277 if ( ! $post ) { 278 return false; 279 } 280 281 if ( false !== strpos( $post->post_name, "{$post->post_parent}-autosave" ) ) { 282 return (int) $post->post_parent; 283 } 284 285 return false; 286 } 287 288 /** 289 * Inserts post data into the posts table as a post revision. 290 * 291 * @since 2.6.0 292 * @access private 293 * 294 * @param int|WP_Post|array|null $post Post ID, post object OR post array. 295 * @param bool $autosave Optional. Is the revision an autosave? 296 * @return int|WP_Error WP_Error or 0 if error, new revision ID if success. 297 */ 298 function _wp_put_post_revision( $post = null, $autosave = false ) { 299 if ( is_object( $post ) ) { 300 $post = get_object_vars( $post ); 301 } elseif ( ! is_array( $post ) ) { 302 $post = get_post( $post, ARRAY_A ); 303 } 304 305 if ( ! $post || empty( $post['ID'] ) ) { 306 return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) ); 307 } 308 309 if ( isset( $post['post_type'] ) && 'revision' == $post['post_type'] ) { 310 return new WP_Error( 'post_type', __( 'Cannot create a revision of a revision' ) ); 311 } 312 313 $post = _wp_post_revision_data( $post, $autosave ); 314 $post = wp_slash( $post ); //since data is from db 315 316 $revision_id = wp_insert_post( $post ); 317 if ( is_wp_error( $revision_id ) ) { 318 return $revision_id; 319 } 320 321 if ( $revision_id ) { 322 /** 323 * Fires once a revision has been saved. 324 * 325 * @since 2.6.0 326 * 327 * @param int $revision_id Post revision ID. 328 */ 329 do_action( '_wp_put_post_revision', $revision_id ); 330 } 331 332 return $revision_id; 333 } 334 335 /** 336 * Gets a post revision. 337 * 338 * @since 2.6.0 339 * 340 * @param int|WP_Post $post The post ID or object. 341 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to 342 * a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT. 343 * @param string $filter Optional sanitation filter. See sanitize_post(). 344 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure. 345 */ 346 function wp_get_post_revision( &$post, $output = OBJECT, $filter = 'raw' ) { 347 $revision = get_post( $post, OBJECT, $filter ); 348 if ( ! $revision ) { 349 return $revision; 350 } 351 if ( 'revision' !== $revision->post_type ) { 352 return null; 353 } 354 355 if ( $output == OBJECT ) { 356 return $revision; 357 } elseif ( $output == ARRAY_A ) { 358 $_revision = get_object_vars( $revision ); 359 return $_revision; 360 } elseif ( $output == ARRAY_N ) { 361 $_revision = array_values( get_object_vars( $revision ) ); 362 return $_revision; 363 } 364 365 return $revision; 366 } 367 368 /** 369 * Restores a post to the specified revision. 370 * 371 * Can restore a past revision using all fields of the post revision, or only selected fields. 372 * 373 * @since 2.6.0 374 * 375 * @param int|WP_Post $revision_id Revision ID or revision object. 376 * @param array $fields Optional. What fields to restore from. Defaults to all. 377 * @return int|false|null Null if error, false if no fields to restore, (int) post ID if success. 378 */ 379 function wp_restore_post_revision( $revision_id, $fields = null ) { 380 $revision = wp_get_post_revision( $revision_id, ARRAY_A ); 381 if ( ! $revision ) { 382 return $revision; 383 } 384 385 if ( ! is_array( $fields ) ) { 386 $fields = array_keys( _wp_post_revision_fields( $revision ) ); 387 } 388 389 $update = array(); 390 foreach ( array_intersect( array_keys( $revision ), $fields ) as $field ) { 391 $update[ $field ] = $revision[ $field ]; 392 } 393 394 if ( ! $update ) { 395 return false; 396 } 397 398 $update['ID'] = $revision['post_parent']; 399 400 $update = wp_slash( $update ); //since data is from db 401 402 $post_id = wp_update_post( $update ); 403 if ( ! $post_id || is_wp_error( $post_id ) ) { 404 return $post_id; 405 } 406 407 // Update last edit user 408 update_post_meta( $post_id, '_edit_last', get_current_user_id() ); 409 410 /** 411 * Fires after a post revision has been restored. 412 * 413 * @since 2.6.0 414 * 415 * @param int $post_id Post ID. 416 * @param int $revision_id Post revision ID. 417 */ 418 do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] ); 419 420 return $post_id; 421 } 422 423 /** 424 * Deletes a revision. 425 * 426 * Deletes the row from the posts table corresponding to the specified revision. 427 * 428 * @since 2.6.0 429 * 430 * @param int|WP_Post $revision_id Revision ID or revision object. 431 * @return array|false|WP_Post|WP_Error|null Null or WP_Error if error, deleted post if success. 432 */ 433 function wp_delete_post_revision( $revision_id ) { 434 $revision = wp_get_post_revision( $revision_id ); 435 if ( ! $revision ) { 436 return $revision; 437 } 438 439 $delete = wp_delete_post( $revision->ID ); 440 if ( $delete ) { 441 /** 442 * Fires once a post revision has been deleted. 443 * 444 * @since 2.6.0 445 * 446 * @param int $revision_id Post revision ID. 447 * @param object|array $revision Post revision object or array. 448 */ 449 do_action( 'wp_delete_post_revision', $revision->ID, $revision ); 450 } 451 452 return $delete; 453 } 454 455 /** 456 * Returns all revisions of specified post. 457 * 458 * @since 2.6.0 459 * 460 * @see get_children() 461 * 462 * @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is global `$post`. 463 * @param array|null $args Optional. Arguments for retrieving post revisions. Default null. 464 * @return array An array of revisions, or an empty array if none. 465 */ 466 function wp_get_post_revisions( $post_id = 0, $args = null ) { 467 $post = get_post( $post_id ); 468 if ( ! $post || empty( $post->ID ) ) { 469 return array(); 470 } 471 472 $defaults = array( 473 'order' => 'DESC', 474 'orderby' => 'date ID', 475 'check_enabled' => true, 476 ); 477 $args = wp_parse_args( $args, $defaults ); 478 479 if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) ) { 480 return array(); 481 } 482 483 $args = array_merge( 484 $args, 485 array( 486 'post_parent' => $post->ID, 487 'post_type' => 'revision', 488 'post_status' => 'inherit', 489 ) 490 ); 491 492 $revisions = get_children( $args ); 493 if ( ! $revisions ) { 494 return array(); 495 } 496 497 return $revisions; 498 } 499 500 /** 501 * Determine if revisions are enabled for a given post. 502 * 503 * @since 3.6.0 504 * 505 * @param WP_Post $post The post object. 506 * @return bool True if number of revisions to keep isn't zero, false otherwise. 507 */ 508 function wp_revisions_enabled( $post ) { 509 return wp_revisions_to_keep( $post ) !== 0; 510 } 511 512 /** 513 * Determine how many revisions to retain for a given post. 514 * 515 * By default, an infinite number of revisions are kept. 516 * 517 * The constant WP_POST_REVISIONS can be set in wp-config to specify the limit 518 * of revisions to keep. 519 * 520 * @since 3.6.0 521 * 522 * @param WP_Post $post The post object. 523 * @return int The number of revisions to keep. 524 */ 525 function wp_revisions_to_keep( $post ) { 526 $num = WP_POST_REVISIONS; 527 528 if ( true === $num ) { 529 $num = -1; 530 } else { 531 $num = intval( $num ); 532 } 533 534 if ( ! post_type_supports( $post->post_type, 'revisions' ) ) { 535 $num = 0; 536 } 537 538 /** 539 * Filters the number of revisions to save for the given post. 540 * 541 * Overrides the value of WP_POST_REVISIONS. 542 * 543 * @since 3.6.0 544 * 545 * @param int $num Number of revisions to store. 546 * @param WP_Post $post Post object. 547 */ 548 return (int) apply_filters( 'wp_revisions_to_keep', $num, $post ); 549 } 550 551 /** 552 * Sets up the post object for preview based on the post autosave. 553 * 554 * @since 2.7.0 555 * @access private 556 * 557 * @param WP_Post $post 558 * @return WP_Post|false 559 */ 560 function _set_preview( $post ) { 561 if ( ! is_object( $post ) ) { 562 return $post; 563 } 564 565 $preview = wp_get_post_autosave( $post->ID ); 566 if ( ! is_object( $preview ) ) { 567 return $post; 568 } 569 570 $preview = sanitize_post( $preview ); 571 572 $post->post_content = $preview->post_content; 573 $post->post_title = $preview->post_title; 574 $post->post_excerpt = $preview->post_excerpt; 575 576 add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 ); 577 add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_filter', 10, 3 ); 578 579 return $post; 580 } 581 582 /** 583 * Filters the latest content for preview from the post autosave. 584 * 585 * @since 2.7.0 586 * @access private 587 */ 588 function _show_post_preview() { 589 if ( isset( $_GET['preview_id'] ) && isset( $_GET['preview_nonce'] ) ) { 590 $id = (int) $_GET['preview_id']; 591 592 if ( false === wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . $id ) ) { 593 wp_die( __( 'Sorry, you are not allowed to preview drafts.' ), 403 ); 594 } 595 596 add_filter( 'the_preview', '_set_preview' ); 597 } 598 } 599 600 /** 601 * Filters terms lookup to set the post format. 602 * 603 * @since 3.6.0 604 * @access private 605 * 606 * @param array $terms 607 * @param int $post_id 608 * @param string $taxonomy 609 * @return array 610 */ 611 function _wp_preview_terms_filter( $terms, $post_id, $taxonomy ) { 612 $post = get_post(); 613 if ( ! $post ) { 614 return $terms; 615 } 616 617 if ( empty( $_REQUEST['post_format'] ) || $post->ID != $post_id || 'post_format' != $taxonomy || 'revision' == $post->post_type ) { 618 return $terms; 619 } 620 621 if ( 'standard' == $_REQUEST['post_format'] ) { 622 $terms = array(); 623 } else { 624 $term = get_term_by( 'slug', 'post-format-' . sanitize_key( $_REQUEST['post_format'] ), 'post_format' ); 625 if ( $term ) { 626 $terms = array( $term ); // Can only have one post format 627 } 628 } 629 630 return $terms; 631 } 632 633 /** 634 * Filters post thumbnail lookup to set the post thumbnail. 635 * 636 * @since 4.6.0 637 * @access private 638 * 639 * @param null|array|string $value The value to return - a single metadata value, or an array of values. 640 * @param int $post_id Post ID. 641 * @param string $meta_key Meta key. 642 * @return null|array The default return value or the post thumbnail meta array. 643 */ 644 function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) { 645 $post = get_post(); 646 if ( ! $post ) { 647 return $value; 648 } 649 650 if ( empty( $_REQUEST['_thumbnail_id'] ) || 651 empty( $_REQUEST['preview_id'] ) || 652 $post->ID != $post_id || 653 '_thumbnail_id' != $meta_key || 654 'revision' == $post->post_type || 655 $post_id != $_REQUEST['preview_id'] ) { 656 657 return $value; 658 } 659 660 $thumbnail_id = intval( $_REQUEST['_thumbnail_id'] ); 661 if ( $thumbnail_id <= 0 ) { 662 return ''; 663 } 664 665 return strval( $thumbnail_id ); 666 } 667 668 /** 669 * Gets the post revision version. 670 * 671 * @since 3.6.0 672 * @access private 673 * 674 * @param WP_Post $revision 675 * @return int|false 676 */ 677 function _wp_get_post_revision_version( $revision ) { 678 if ( is_object( $revision ) ) { 679 $revision = get_object_vars( $revision ); 680 } elseif ( ! is_array( $revision ) ) { 681 return false; 682 } 683 684 if ( preg_match( '/^\d+-(?:autosave|revision)-v(\d+)$/', $revision['post_name'], $matches ) ) { 685 return (int) $matches[1]; 686 } 687 688 return 0; 689 } 690 691 /** 692 * Upgrade the revisions author, add the current post as a revision and set the revisions version to 1 693 * 694 * @since 3.6.0 695 * @access private 696 * 697 * @global wpdb $wpdb WordPress database abstraction object. 698 * 699 * @param WP_Post $post Post object 700 * @param array $revisions Current revisions of the post 701 * @return bool true if the revisions were upgraded, false if problems 702 */ 703 function _wp_upgrade_revisions_of_post( $post, $revisions ) { 704 global $wpdb; 705 706 // Add post option exclusively 707 $lock = "revision-upgrade-{$post->ID}"; 708 $now = time(); 709 $result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'no') /* LOCK */", $lock, $now ) ); 710 if ( ! $result ) { 711 // If we couldn't get a lock, see how old the previous lock is 712 $locked = get_option( $lock ); 713 if ( ! $locked ) { 714 // Can't write to the lock, and can't read the lock. 715 // Something broken has happened 716 return false; 717 } 718 719 if ( $locked > $now - 3600 ) { 720 // Lock is not too old: some other process may be upgrading this post. Bail. 721 return false; 722 } 723 724 // Lock is too old - update it (below) and continue 725 } 726 727 // If we could get a lock, re-"add" the option to fire all the correct filters. 728 update_option( $lock, $now ); 729 730 reset( $revisions ); 731 $add_last = true; 732 733 do { 734 $this_revision = current( $revisions ); 735 $prev_revision = next( $revisions ); 736 737 $this_revision_version = _wp_get_post_revision_version( $this_revision ); 738 739 // Something terrible happened 740 if ( false === $this_revision_version ) { 741 continue; 742 } 743 744 // 1 is the latest revision version, so we're already up to date. 745 // No need to add a copy of the post as latest revision. 746 if ( 0 < $this_revision_version ) { 747 $add_last = false; 748 continue; 749 } 750 751 // Always update the revision version 752 $update = array( 753 'post_name' => preg_replace( '/^(\d+-(?:autosave|revision))[\d-]*$/', '$1-v1', $this_revision->post_name ), 754 ); 755 756 // If this revision is the oldest revision of the post, i.e. no $prev_revision, 757 // the correct post_author is probably $post->post_author, but that's only a good guess. 758 // Update the revision version only and Leave the author as-is. 759 if ( $prev_revision ) { 760 $prev_revision_version = _wp_get_post_revision_version( $prev_revision ); 761 762 // If the previous revision is already up to date, it no longer has the information we need :( 763 if ( $prev_revision_version < 1 ) { 764 $update['post_author'] = $prev_revision->post_author; 765 } 766 } 767 768 // Upgrade this revision 769 $result = $wpdb->update( $wpdb->posts, $update, array( 'ID' => $this_revision->ID ) ); 770 771 if ( $result ) { 772 wp_cache_delete( $this_revision->ID, 'posts' ); 773 } 774 } while ( $prev_revision ); 775 776 delete_option( $lock ); 777 778 // Add a copy of the post as latest revision. 779 if ( $add_last ) { 780 wp_save_post_revision( $post->ID ); 781 } 782 783 return true; 784 }
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