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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 * @param array|WP_Post $post Optional. A post array or a WP_Post object being processed 18 * for insertion as a post revision. Default empty array. 19 * @param bool $deprecated Not used. 20 * @return string[] Array of fields that can be versioned. 21 */ 22 function _wp_post_revision_fields( $post = array(), $deprecated = false ) { 23 static $fields = null; 24 25 if ( ! is_array( $post ) ) { 26 $post = get_post( $post, ARRAY_A ); 27 } 28 29 if ( is_null( $fields ) ) { 30 // Allow these to be versioned. 31 $fields = array( 32 'post_title' => __( 'Title' ), 33 'post_content' => __( 'Content' ), 34 'post_excerpt' => __( 'Excerpt' ), 35 ); 36 } 37 38 /** 39 * Filters the list of fields saved in post revisions. 40 * 41 * Included by default: 'post_title', 'post_content' and 'post_excerpt'. 42 * 43 * Disallowed fields: 'ID', 'post_name', 'post_parent', 'post_date', 44 * 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 45 * and 'post_author'. 46 * 47 * @since 2.6.0 48 * @since 4.5.0 The `$post` parameter was added. 49 * 50 * @param string[] $fields List of fields to revision. Contains 'post_title', 51 * 'post_content', and 'post_excerpt' by default. 52 * @param array $post A post array being processed for insertion as a post revision. 53 */ 54 $fields = apply_filters( '_wp_post_revision_fields', $fields, $post ); 55 56 // WP uses these internally either in versioning or elsewhere - they cannot be versioned. 57 foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) { 58 unset( $fields[ $protect ] ); 59 } 60 61 return $fields; 62 } 63 64 /** 65 * Returns a post array ready to be inserted into the posts table as a post revision. 66 * 67 * @since 4.5.0 68 * @access private 69 * 70 * @param array|WP_Post $post Optional. A post array or a WP_Post object to be processed 71 * for insertion as a post revision. Default empty array. 72 * @param bool $autosave Optional. Is the revision an autosave? Default false. 73 * @return array Post array ready to be inserted as a post revision. 74 */ 75 function _wp_post_revision_data( $post = array(), $autosave = false ) { 76 if ( ! is_array( $post ) ) { 77 $post = get_post( $post, ARRAY_A ); 78 } 79 80 $fields = _wp_post_revision_fields( $post ); 81 82 $revision_data = array(); 83 84 foreach ( array_intersect( array_keys( $post ), array_keys( $fields ) ) as $field ) { 85 $revision_data[ $field ] = $post[ $field ]; 86 } 87 88 $revision_data['post_parent'] = $post['ID']; 89 $revision_data['post_status'] = 'inherit'; 90 $revision_data['post_type'] = 'revision'; 91 $revision_data['post_name'] = $autosave ? "$post[ID]-autosave-v1" : "$post[ID]-revision-v1"; // "1" is the revisioning system version. 92 $revision_data['post_date'] = isset( $post['post_modified'] ) ? $post['post_modified'] : ''; 93 $revision_data['post_date_gmt'] = isset( $post['post_modified_gmt'] ) ? $post['post_modified_gmt'] : ''; 94 95 return $revision_data; 96 } 97 98 /** 99 * Saves revisions for a post after all changes have been made. 100 * 101 * @since 6.4.0 102 * 103 * @param int $post_id The post id that was inserted. 104 * @param WP_Post $post The post object that was inserted. 105 * @param bool $update Whether this insert is updating an existing post. 106 */ 107 function wp_save_post_revision_on_insert( $post_id, $post, $update ) { 108 if ( ! $update ) { 109 return; 110 } 111 112 if ( ! has_action( 'post_updated', 'wp_save_post_revision' ) ) { 113 return; 114 } 115 116 wp_save_post_revision( $post_id ); 117 } 118 119 /** 120 * Creates a revision for the current version of a post. 121 * 122 * Typically used immediately after a post update, as every update is a revision, 123 * and the most recent revision always matches the current post. 124 * 125 * @since 2.6.0 126 * 127 * @param int $post_id The ID of the post to save as a revision. 128 * @return int|WP_Error|void Void or 0 if error, new revision ID, if success. 129 */ 130 function wp_save_post_revision( $post_id ) { 131 if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) { 132 return; 133 } 134 135 // Prevent saving post revisions if revisions should be saved on wp_after_insert_post. 136 if ( doing_action( 'post_updated' ) && has_action( 'wp_after_insert_post', 'wp_save_post_revision_on_insert' ) ) { 137 return; 138 } 139 140 $post = get_post( $post_id ); 141 142 if ( ! $post ) { 143 return; 144 } 145 146 if ( ! post_type_supports( $post->post_type, 'revisions' ) ) { 147 return; 148 } 149 150 if ( 'auto-draft' === $post->post_status ) { 151 return; 152 } 153 154 if ( ! wp_revisions_enabled( $post ) ) { 155 return; 156 } 157 158 /* 159 * Compare the proposed update with the last stored revision verifying that 160 * they are different, unless a plugin tells us to always save regardless. 161 * If no previous revisions, save one. 162 */ 163 $revisions = wp_get_post_revisions( $post_id ); 164 if ( $revisions ) { 165 // Grab the latest revision, but not an autosave. 166 foreach ( $revisions as $revision ) { 167 if ( str_contains( $revision->post_name, "{$revision->post_parent}-revision" ) ) { 168 $latest_revision = $revision; 169 break; 170 } 171 } 172 173 /** 174 * Filters whether the post has changed since the latest revision. 175 * 176 * By default a revision is saved only if one of the revisioned fields has changed. 177 * This filter can override that so a revision is saved even if nothing has changed. 178 * 179 * @since 3.6.0 180 * 181 * @param bool $check_for_changes Whether to check for changes before saving a new revision. 182 * Default true. 183 * @param WP_Post $latest_revision The latest revision post object. 184 * @param WP_Post $post The post object. 185 */ 186 if ( isset( $latest_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $latest_revision, $post ) ) { 187 $post_has_changed = false; 188 189 foreach ( array_keys( _wp_post_revision_fields( $post ) ) as $field ) { 190 if ( normalize_whitespace( $post->$field ) !== normalize_whitespace( $latest_revision->$field ) ) { 191 $post_has_changed = true; 192 break; 193 } 194 } 195 196 /** 197 * Filters whether a post has changed. 198 * 199 * By default a revision is saved only if one of the revisioned fields has changed. 200 * This filter allows for additional checks to determine if there were changes. 201 * 202 * @since 4.1.0 203 * 204 * @param bool $post_has_changed Whether the post has changed. 205 * @param WP_Post $latest_revision The latest revision post object. 206 * @param WP_Post $post The post object. 207 */ 208 $post_has_changed = (bool) apply_filters( 'wp_save_post_revision_post_has_changed', $post_has_changed, $latest_revision, $post ); 209 210 // Don't save revision if post unchanged. 211 if ( ! $post_has_changed ) { 212 return; 213 } 214 } 215 } 216 217 $return = _wp_put_post_revision( $post ); 218 219 /* 220 * If a limit for the number of revisions to keep has been set, 221 * delete the oldest ones. 222 */ 223 $revisions_to_keep = wp_revisions_to_keep( $post ); 224 225 if ( $revisions_to_keep < 0 ) { 226 return $return; 227 } 228 229 $revisions = wp_get_post_revisions( $post_id, array( 'order' => 'ASC' ) ); 230 231 /** 232 * Filters the revisions to be considered for deletion. 233 * 234 * @since 6.2.0 235 * 236 * @param WP_Post[] $revisions Array of revisions, or an empty array if none. 237 * @param int $post_id The ID of the post to save as a revision. 238 */ 239 $revisions = apply_filters( 240 'wp_save_post_revision_revisions_before_deletion', 241 $revisions, 242 $post_id 243 ); 244 245 $delete = count( $revisions ) - $revisions_to_keep; 246 247 if ( $delete < 1 ) { 248 return $return; 249 } 250 251 $revisions = array_slice( $revisions, 0, $delete ); 252 253 for ( $i = 0; isset( $revisions[ $i ] ); $i++ ) { 254 if ( str_contains( $revisions[ $i ]->post_name, 'autosave' ) ) { 255 continue; 256 } 257 258 wp_delete_post_revision( $revisions[ $i ]->ID ); 259 } 260 261 return $return; 262 } 263 264 /** 265 * Retrieves the autosaved data of the specified post. 266 * 267 * Returns a post object with the information that was autosaved for the specified post. 268 * If the optional $user_id is passed, returns the autosave for that user, otherwise 269 * returns the latest autosave. 270 * 271 * @since 2.6.0 272 * 273 * @global wpdb $wpdb WordPress database abstraction object. 274 * 275 * @param int $post_id The post ID. 276 * @param int $user_id Optional. The post author ID. Default 0. 277 * @return WP_Post|false The autosaved data or false on failure or when no autosave exists. 278 */ 279 function wp_get_post_autosave( $post_id, $user_id = 0 ) { 280 global $wpdb; 281 282 $autosave_name = $post_id . '-autosave-v1'; 283 $user_id_query = ( 0 !== $user_id ) ? "AND post_author = $user_id" : null; 284 285 // Construct the autosave query. 286 $autosave_query = " 287 SELECT * 288 FROM $wpdb->posts 289 WHERE post_parent = %d 290 AND post_type = 'revision' 291 AND post_status = 'inherit' 292 AND post_name = %s " . $user_id_query . ' 293 ORDER BY post_date DESC 294 LIMIT 1'; 295 296 $autosave = $wpdb->get_results( 297 $wpdb->prepare( 298 $autosave_query, 299 $post_id, 300 $autosave_name 301 ) 302 ); 303 304 if ( ! $autosave ) { 305 return false; 306 } 307 308 return get_post( $autosave[0] ); 309 } 310 311 /** 312 * Determines if the specified post is a revision. 313 * 314 * @since 2.6.0 315 * 316 * @param int|WP_Post $post Post ID or post object. 317 * @return int|false ID of revision's parent on success, false if not a revision. 318 */ 319 function wp_is_post_revision( $post ) { 320 $post = wp_get_post_revision( $post ); 321 322 if ( ! $post ) { 323 return false; 324 } 325 326 return (int) $post->post_parent; 327 } 328 329 /** 330 * Determines if the specified post is an autosave. 331 * 332 * @since 2.6.0 333 * 334 * @param int|WP_Post $post Post ID or post object. 335 * @return int|false ID of autosave's parent on success, false if not a revision. 336 */ 337 function wp_is_post_autosave( $post ) { 338 $post = wp_get_post_revision( $post ); 339 340 if ( ! $post ) { 341 return false; 342 } 343 344 if ( str_contains( $post->post_name, "{$post->post_parent}-autosave" ) ) { 345 return (int) $post->post_parent; 346 } 347 348 return false; 349 } 350 351 /** 352 * Inserts post data into the posts table as a post revision. 353 * 354 * @since 2.6.0 355 * @access private 356 * 357 * @param int|WP_Post|array|null $post Post ID, post object OR post array. 358 * @param bool $autosave Optional. Whether the revision is an autosave or not. 359 * Default false. 360 * @return int|WP_Error WP_Error or 0 if error, new revision ID if success. 361 */ 362 function _wp_put_post_revision( $post = null, $autosave = false ) { 363 if ( is_object( $post ) ) { 364 $post = get_object_vars( $post ); 365 } elseif ( ! is_array( $post ) ) { 366 $post = get_post( $post, ARRAY_A ); 367 } 368 369 if ( ! $post || empty( $post['ID'] ) ) { 370 return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) ); 371 } 372 373 if ( isset( $post['post_type'] ) && 'revision' === $post['post_type'] ) { 374 return new WP_Error( 'post_type', __( 'Cannot create a revision of a revision' ) ); 375 } 376 377 $post = _wp_post_revision_data( $post, $autosave ); 378 $post = wp_slash( $post ); // Since data is from DB. 379 380 $revision_id = wp_insert_post( $post, true ); 381 if ( is_wp_error( $revision_id ) ) { 382 return $revision_id; 383 } 384 385 if ( $revision_id ) { 386 /** 387 * Fires once a revision has been saved. 388 * 389 * @since 2.6.0 390 * @since 6.4.0 The post_id parameter was added. 391 * 392 * @param int $revision_id Post revision ID. 393 * @param int $post_id Post ID. 394 */ 395 do_action( '_wp_put_post_revision', $revision_id, $post['post_parent'] ); 396 } 397 398 return $revision_id; 399 } 400 401 402 /** 403 * Save the revisioned meta fields. 404 * 405 * @since 6.4.0 406 * 407 * @param int $revision_id The ID of the revision to save the meta to. 408 * @param int $post_id The ID of the post the revision is associated with. 409 */ 410 function wp_save_revisioned_meta_fields( $revision_id, $post_id ) { 411 $post_type = get_post_type( $post_id ); 412 if ( ! $post_type ) { 413 return; 414 } 415 416 foreach ( wp_post_revision_meta_keys( $post_type ) as $meta_key ) { 417 if ( metadata_exists( 'post', $post_id, $meta_key ) ) { 418 _wp_copy_post_meta( $post_id, $revision_id, $meta_key ); 419 } 420 } 421 } 422 423 /** 424 * Gets a post revision. 425 * 426 * @since 2.6.0 427 * 428 * @param int|WP_Post $post Post ID or post object. 429 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which 430 * correspond to a WP_Post object, an associative array, or a numeric array, 431 * respectively. Default OBJECT. 432 * @param string $filter Optional sanitization filter. See sanitize_post(). Default 'raw'. 433 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure. 434 */ 435 function wp_get_post_revision( &$post, $output = OBJECT, $filter = 'raw' ) { 436 $revision = get_post( $post, OBJECT, $filter ); 437 438 if ( ! $revision ) { 439 return $revision; 440 } 441 442 if ( 'revision' !== $revision->post_type ) { 443 return null; 444 } 445 446 if ( OBJECT === $output ) { 447 return $revision; 448 } elseif ( ARRAY_A === $output ) { 449 $_revision = get_object_vars( $revision ); 450 return $_revision; 451 } elseif ( ARRAY_N === $output ) { 452 $_revision = array_values( get_object_vars( $revision ) ); 453 return $_revision; 454 } 455 456 return $revision; 457 } 458 459 /** 460 * Restores a post to the specified revision. 461 * 462 * Can restore a past revision using all fields of the post revision, or only selected fields. 463 * 464 * @since 2.6.0 465 * 466 * @param int|WP_Post $revision Revision ID or revision object. 467 * @param array $fields Optional. What fields to restore from. Defaults to all. 468 * @return int|false|null Null if error, false if no fields to restore, (int) post ID if success. 469 */ 470 function wp_restore_post_revision( $revision, $fields = null ) { 471 $revision = wp_get_post_revision( $revision, ARRAY_A ); 472 473 if ( ! $revision ) { 474 return $revision; 475 } 476 477 if ( ! is_array( $fields ) ) { 478 $fields = array_keys( _wp_post_revision_fields( $revision ) ); 479 } 480 481 $update = array(); 482 foreach ( array_intersect( array_keys( $revision ), $fields ) as $field ) { 483 $update[ $field ] = $revision[ $field ]; 484 } 485 486 if ( ! $update ) { 487 return false; 488 } 489 490 $update['ID'] = $revision['post_parent']; 491 492 $update = wp_slash( $update ); // Since data is from DB. 493 494 $post_id = wp_update_post( $update ); 495 496 if ( ! $post_id || is_wp_error( $post_id ) ) { 497 return $post_id; 498 } 499 500 // Update last edit user. 501 update_post_meta( $post_id, '_edit_last', get_current_user_id() ); 502 503 /** 504 * Fires after a post revision has been restored. 505 * 506 * @since 2.6.0 507 * 508 * @param int $post_id Post ID. 509 * @param int $revision_id Post revision ID. 510 */ 511 do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] ); 512 513 return $post_id; 514 } 515 516 /** 517 * Restore the revisioned meta values for a post. 518 * 519 * @since 6.4.0 520 * 521 * @param int $post_id The ID of the post to restore the meta to. 522 * @param int $revision_id The ID of the revision to restore the meta from. 523 */ 524 function wp_restore_post_revision_meta( $post_id, $revision_id ) { 525 $post_type = get_post_type( $post_id ); 526 if ( ! $post_type ) { 527 return; 528 } 529 530 // Restore revisioned meta fields. 531 foreach ( wp_post_revision_meta_keys( $post_type ) as $meta_key ) { 532 533 // Clear any existing meta. 534 delete_post_meta( $post_id, $meta_key ); 535 536 _wp_copy_post_meta( $revision_id, $post_id, $meta_key ); 537 } 538 } 539 540 /** 541 * Copy post meta for the given key from one post to another. 542 * 543 * @since 6.4.0 544 * 545 * @param int $source_post_id Post ID to copy meta value(s) from. 546 * @param int $target_post_id Post ID to copy meta value(s) to. 547 * @param string $meta_key Meta key to copy. 548 */ 549 function _wp_copy_post_meta( $source_post_id, $target_post_id, $meta_key ) { 550 551 foreach ( get_post_meta( $source_post_id, $meta_key ) as $meta_value ) { 552 /** 553 * We use add_metadata() function vs add_post_meta() here 554 * to allow for a revision post target OR regular post. 555 */ 556 add_metadata( 'post', $target_post_id, $meta_key, wp_slash( $meta_value ) ); 557 } 558 } 559 560 /** 561 * Determine which post meta fields should be revisioned. 562 * 563 * @since 6.4.0 564 * 565 * @param string $post_type The post type being revisioned. 566 * @return array An array of meta keys to be revisioned. 567 */ 568 function wp_post_revision_meta_keys( $post_type ) { 569 $registered_meta = array_merge( 570 get_registered_meta_keys( 'post' ), 571 get_registered_meta_keys( 'post', $post_type ) 572 ); 573 574 $wp_revisioned_meta_keys = array(); 575 576 foreach ( $registered_meta as $name => $args ) { 577 if ( $args['revisions_enabled'] ) { 578 $wp_revisioned_meta_keys[ $name ] = true; 579 } 580 } 581 582 $wp_revisioned_meta_keys = array_keys( $wp_revisioned_meta_keys ); 583 584 /** 585 * Filter the list of post meta keys to be revisioned. 586 * 587 * @since 6.4.0 588 * 589 * @param array $keys An array of meta fields to be revisioned. 590 * @param string $post_type The post type being revisioned. 591 */ 592 return apply_filters( 'wp_post_revision_meta_keys', $wp_revisioned_meta_keys, $post_type ); 593 } 594 595 /** 596 * Check whether revisioned post meta fields have changed. 597 * 598 * @since 6.4.0 599 * 600 * @param bool $post_has_changed Whether the post has changed. 601 * @param WP_Post $last_revision The last revision post object. 602 * @param WP_Post $post The post object. 603 * @return bool Whether the post has changed. 604 */ 605 function wp_check_revisioned_meta_fields_have_changed( $post_has_changed, WP_Post $last_revision, WP_Post $post ) { 606 foreach ( wp_post_revision_meta_keys( $post->post_type ) as $meta_key ) { 607 if ( get_post_meta( $post->ID, $meta_key ) !== get_post_meta( $last_revision->ID, $meta_key ) ) { 608 $post_has_changed = true; 609 break; 610 } 611 } 612 return $post_has_changed; 613 } 614 615 /** 616 * Deletes a revision. 617 * 618 * Deletes the row from the posts table corresponding to the specified revision. 619 * 620 * @since 2.6.0 621 * 622 * @param int|WP_Post $revision Revision ID or revision object. 623 * @return WP_Post|false|null Null or false if error, deleted post object if success. 624 */ 625 function wp_delete_post_revision( $revision ) { 626 $revision = wp_get_post_revision( $revision ); 627 628 if ( ! $revision ) { 629 return $revision; 630 } 631 632 $delete = wp_delete_post( $revision->ID ); 633 634 if ( $delete ) { 635 /** 636 * Fires once a post revision has been deleted. 637 * 638 * @since 2.6.0 639 * 640 * @param int $revision_id Post revision ID. 641 * @param WP_Post $revision Post revision object. 642 */ 643 do_action( 'wp_delete_post_revision', $revision->ID, $revision ); 644 } 645 646 return $delete; 647 } 648 649 /** 650 * Returns all revisions of specified post. 651 * 652 * @since 2.6.0 653 * 654 * @see get_children() 655 * 656 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`. 657 * @param array|null $args Optional. Arguments for retrieving post revisions. Default null. 658 * @return WP_Post[]|int[] Array of revision objects or IDs, or an empty array if none. 659 */ 660 function wp_get_post_revisions( $post = 0, $args = null ) { 661 $post = get_post( $post ); 662 663 if ( ! $post || empty( $post->ID ) ) { 664 return array(); 665 } 666 667 $defaults = array( 668 'order' => 'DESC', 669 'orderby' => 'date ID', 670 'check_enabled' => true, 671 ); 672 $args = wp_parse_args( $args, $defaults ); 673 674 if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) ) { 675 return array(); 676 } 677 678 $args = array_merge( 679 $args, 680 array( 681 'post_parent' => $post->ID, 682 'post_type' => 'revision', 683 'post_status' => 'inherit', 684 ) 685 ); 686 687 $revisions = get_children( $args ); 688 689 if ( ! $revisions ) { 690 return array(); 691 } 692 693 return $revisions; 694 } 695 696 /** 697 * Returns the latest revision ID and count of revisions for a post. 698 * 699 * @since 6.1.0 700 * 701 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post. 702 * @return array|WP_Error { 703 * Returns associative array with latest revision ID and total count, 704 * or a WP_Error if the post does not exist or revisions are not enabled. 705 * 706 * @type int $latest_id The latest revision post ID or 0 if no revisions exist. 707 * @type int $count The total count of revisions for the given post. 708 * } 709 */ 710 function wp_get_latest_revision_id_and_total_count( $post = 0 ) { 711 $post = get_post( $post ); 712 713 if ( ! $post ) { 714 return new WP_Error( 'invalid_post', __( 'Invalid post.' ) ); 715 } 716 717 if ( ! wp_revisions_enabled( $post ) ) { 718 return new WP_Error( 'revisions_not_enabled', __( 'Revisions not enabled.' ) ); 719 } 720 721 $args = array( 722 'post_parent' => $post->ID, 723 'fields' => 'ids', 724 'post_type' => 'revision', 725 'post_status' => 'inherit', 726 'order' => 'DESC', 727 'orderby' => 'date ID', 728 'posts_per_page' => 1, 729 'ignore_sticky_posts' => true, 730 ); 731 732 $revision_query = new WP_Query(); 733 $revisions = $revision_query->query( $args ); 734 735 if ( ! $revisions ) { 736 return array( 737 'latest_id' => 0, 738 'count' => 0, 739 ); 740 } 741 742 return array( 743 'latest_id' => $revisions[0], 744 'count' => $revision_query->found_posts, 745 ); 746 } 747 748 /** 749 * Returns the url for viewing and potentially restoring revisions of a given post. 750 * 751 * @since 5.9.0 752 * 753 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`. 754 * @return string|null The URL for editing revisions on the given post, otherwise null. 755 */ 756 function wp_get_post_revisions_url( $post = 0 ) { 757 $post = get_post( $post ); 758 759 if ( ! $post instanceof WP_Post ) { 760 return null; 761 } 762 763 // If the post is a revision, return early. 764 if ( 'revision' === $post->post_type ) { 765 return get_edit_post_link( $post ); 766 } 767 768 if ( ! wp_revisions_enabled( $post ) ) { 769 return null; 770 } 771 772 $revisions = wp_get_latest_revision_id_and_total_count( $post->ID ); 773 774 if ( is_wp_error( $revisions ) || 0 === $revisions['count'] ) { 775 return null; 776 } 777 778 return get_edit_post_link( $revisions['latest_id'] ); 779 } 780 781 /** 782 * Determines whether revisions are enabled for a given post. 783 * 784 * @since 3.6.0 785 * 786 * @param WP_Post $post The post object. 787 * @return bool True if number of revisions to keep isn't zero, false otherwise. 788 */ 789 function wp_revisions_enabled( $post ) { 790 return wp_revisions_to_keep( $post ) !== 0; 791 } 792 793 /** 794 * Determines how many revisions to retain for a given post. 795 * 796 * By default, an infinite number of revisions are kept. 797 * 798 * The constant WP_POST_REVISIONS can be set in wp-config to specify the limit 799 * of revisions to keep. 800 * 801 * @since 3.6.0 802 * 803 * @param WP_Post $post The post object. 804 * @return int The number of revisions to keep. 805 */ 806 function wp_revisions_to_keep( $post ) { 807 $num = WP_POST_REVISIONS; 808 809 if ( true === $num ) { 810 $num = -1; 811 } else { 812 $num = (int) $num; 813 } 814 815 if ( ! post_type_supports( $post->post_type, 'revisions' ) ) { 816 $num = 0; 817 } 818 819 /** 820 * Filters the number of revisions to save for the given post. 821 * 822 * Overrides the value of WP_POST_REVISIONS. 823 * 824 * @since 3.6.0 825 * 826 * @param int $num Number of revisions to store. 827 * @param WP_Post $post Post object. 828 */ 829 $num = apply_filters( 'wp_revisions_to_keep', $num, $post ); 830 831 /** 832 * Filters the number of revisions to save for the given post by its post type. 833 * 834 * Overrides both the value of WP_POST_REVISIONS and the {@see 'wp_revisions_to_keep'} filter. 835 * 836 * The dynamic portion of the hook name, `$post->post_type`, refers to 837 * the post type slug. 838 * 839 * Possible hook names include: 840 * 841 * - `wp_post_revisions_to_keep` 842 * - `wp_page_revisions_to_keep` 843 * 844 * @since 5.8.0 845 * 846 * @param int $num Number of revisions to store. 847 * @param WP_Post $post Post object. 848 */ 849 $num = apply_filters( "wp_{$post->post_type}_revisions_to_keep", $num, $post ); 850 851 return (int) $num; 852 } 853 854 /** 855 * Sets up the post object for preview based on the post autosave. 856 * 857 * @since 2.7.0 858 * @access private 859 * 860 * @param WP_Post $post 861 * @return WP_Post|false 862 */ 863 function _set_preview( $post ) { 864 if ( ! is_object( $post ) ) { 865 return $post; 866 } 867 868 $preview = wp_get_post_autosave( $post->ID ); 869 870 if ( is_object( $preview ) ) { 871 $preview = sanitize_post( $preview ); 872 873 $post->post_content = $preview->post_content; 874 $post->post_title = $preview->post_title; 875 $post->post_excerpt = $preview->post_excerpt; 876 } 877 878 add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 ); 879 add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_filter', 10, 3 ); 880 add_filter( 'get_post_metadata', '_wp_preview_meta_filter', 10, 4 ); 881 882 return $post; 883 } 884 885 /** 886 * Filters the latest content for preview from the post autosave. 887 * 888 * @since 2.7.0 889 * @access private 890 */ 891 function _show_post_preview() { 892 if ( isset( $_GET['preview_id'] ) && isset( $_GET['preview_nonce'] ) ) { 893 $id = (int) $_GET['preview_id']; 894 895 if ( false === wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . $id ) ) { 896 wp_die( __( 'Sorry, you are not allowed to preview drafts.' ), 403 ); 897 } 898 899 add_filter( 'the_preview', '_set_preview' ); 900 } 901 } 902 903 /** 904 * Filters terms lookup to set the post format. 905 * 906 * @since 3.6.0 907 * @access private 908 * 909 * @param array $terms 910 * @param int $post_id 911 * @param string $taxonomy 912 * @return array 913 */ 914 function _wp_preview_terms_filter( $terms, $post_id, $taxonomy ) { 915 $post = get_post(); 916 917 if ( ! $post ) { 918 return $terms; 919 } 920 921 if ( empty( $_REQUEST['post_format'] ) || $post->ID !== $post_id 922 || 'post_format' !== $taxonomy || 'revision' === $post->post_type 923 ) { 924 return $terms; 925 } 926 927 if ( 'standard' === $_REQUEST['post_format'] ) { 928 $terms = array(); 929 } else { 930 $term = get_term_by( 'slug', 'post-format-' . sanitize_key( $_REQUEST['post_format'] ), 'post_format' ); 931 932 if ( $term ) { 933 $terms = array( $term ); // Can only have one post format. 934 } 935 } 936 937 return $terms; 938 } 939 940 /** 941 * Filters post thumbnail lookup to set the post thumbnail. 942 * 943 * @since 4.6.0 944 * @access private 945 * 946 * @param null|array|string $value The value to return - a single metadata value, or an array of values. 947 * @param int $post_id Post ID. 948 * @param string $meta_key Meta key. 949 * @return null|array The default return value or the post thumbnail meta array. 950 */ 951 function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) { 952 $post = get_post(); 953 954 if ( ! $post ) { 955 return $value; 956 } 957 958 if ( empty( $_REQUEST['_thumbnail_id'] ) || empty( $_REQUEST['preview_id'] ) 959 || $post->ID !== $post_id || $post_id !== (int) $_REQUEST['preview_id'] 960 || '_thumbnail_id' !== $meta_key || 'revision' === $post->post_type 961 ) { 962 return $value; 963 } 964 965 $thumbnail_id = (int) $_REQUEST['_thumbnail_id']; 966 967 if ( $thumbnail_id <= 0 ) { 968 return ''; 969 } 970 971 return (string) $thumbnail_id; 972 } 973 974 /** 975 * Gets the post revision version. 976 * 977 * @since 3.6.0 978 * @access private 979 * 980 * @param WP_Post $revision 981 * @return int|false 982 */ 983 function _wp_get_post_revision_version( $revision ) { 984 if ( is_object( $revision ) ) { 985 $revision = get_object_vars( $revision ); 986 } elseif ( ! is_array( $revision ) ) { 987 return false; 988 } 989 990 if ( preg_match( '/^\d+-(?:autosave|revision)-v(\d+)$/', $revision['post_name'], $matches ) ) { 991 return (int) $matches[1]; 992 } 993 994 return 0; 995 } 996 997 /** 998 * Upgrades the revisions author, adds the current post as a revision and sets the revisions version to 1. 999 * 1000 * @since 3.6.0 1001 * @access private 1002 * 1003 * @global wpdb $wpdb WordPress database abstraction object. 1004 * 1005 * @param WP_Post $post Post object. 1006 * @param array $revisions Current revisions of the post. 1007 * @return bool true if the revisions were upgraded, false if problems. 1008 */ 1009 function _wp_upgrade_revisions_of_post( $post, $revisions ) { 1010 global $wpdb; 1011 1012 // Add post option exclusively. 1013 $lock = "revision-upgrade-{$post->ID}"; 1014 $now = time(); 1015 $result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'no') /* LOCK */", $lock, $now ) ); 1016 1017 if ( ! $result ) { 1018 // If we couldn't get a lock, see how old the previous lock is. 1019 $locked = get_option( $lock ); 1020 1021 if ( ! $locked ) { 1022 /* 1023 * Can't write to the lock, and can't read the lock. 1024 * Something broken has happened. 1025 */ 1026 return false; 1027 } 1028 1029 if ( $locked > $now - HOUR_IN_SECONDS ) { 1030 // Lock is not too old: some other process may be upgrading this post. Bail. 1031 return false; 1032 } 1033 1034 // Lock is too old - update it (below) and continue. 1035 } 1036 1037 // If we could get a lock, re-"add" the option to fire all the correct filters. 1038 update_option( $lock, $now ); 1039 1040 reset( $revisions ); 1041 $add_last = true; 1042 1043 do { 1044 $this_revision = current( $revisions ); 1045 $prev_revision = next( $revisions ); 1046 1047 $this_revision_version = _wp_get_post_revision_version( $this_revision ); 1048 1049 // Something terrible happened. 1050 if ( false === $this_revision_version ) { 1051 continue; 1052 } 1053 1054 /* 1055 * 1 is the latest revision version, so we're already up to date. 1056 * No need to add a copy of the post as latest revision. 1057 */ 1058 if ( 0 < $this_revision_version ) { 1059 $add_last = false; 1060 continue; 1061 } 1062 1063 // Always update the revision version. 1064 $update = array( 1065 'post_name' => preg_replace( '/^(\d+-(?:autosave|revision))[\d-]*$/', '$1-v1', $this_revision->post_name ), 1066 ); 1067 1068 /* 1069 * If this revision is the oldest revision of the post, i.e. no $prev_revision, 1070 * the correct post_author is probably $post->post_author, but that's only a good guess. 1071 * Update the revision version only and Leave the author as-is. 1072 */ 1073 if ( $prev_revision ) { 1074 $prev_revision_version = _wp_get_post_revision_version( $prev_revision ); 1075 1076 // If the previous revision is already up to date, it no longer has the information we need :( 1077 if ( $prev_revision_version < 1 ) { 1078 $update['post_author'] = $prev_revision->post_author; 1079 } 1080 } 1081 1082 // Upgrade this revision. 1083 $result = $wpdb->update( $wpdb->posts, $update, array( 'ID' => $this_revision->ID ) ); 1084 1085 if ( $result ) { 1086 wp_cache_delete( $this_revision->ID, 'posts' ); 1087 } 1088 } while ( $prev_revision ); 1089 1090 delete_option( $lock ); 1091 1092 // Add a copy of the post as latest revision. 1093 if ( $add_last ) { 1094 wp_save_post_revision( $post->ID ); 1095 } 1096 1097 return true; 1098 } 1099 1100 /** 1101 * Filters preview post meta retrieval to get values from the autosave. 1102 * 1103 * Filters revisioned meta keys only. 1104 * 1105 * @since 6.4.0 1106 * 1107 * @param mixed $value Meta value to filter. 1108 * @param int $object_id Object ID. 1109 * @param string $meta_key Meta key to filter a value for. 1110 * @param bool $single Whether to return a single value. Default false. 1111 * @return mixed Original meta value if the meta key isn't revisioned, the object doesn't exist, 1112 * the post type is a revision or the post ID doesn't match the object ID. 1113 * Otherwise, the revisioned meta value is returned for the preview. 1114 */ 1115 function _wp_preview_meta_filter( $value, $object_id, $meta_key, $single ) { 1116 1117 $post = get_post(); 1118 if ( 1119 empty( $post ) || 1120 $post->ID !== $object_id || 1121 ! in_array( $meta_key, wp_post_revision_meta_keys( $post->post_type ), true ) || 1122 'revision' === $post->post_type 1123 ) { 1124 return $value; 1125 } 1126 1127 $preview = wp_get_post_autosave( $post->ID ); 1128 if ( false === $preview ) { 1129 return $value; 1130 } 1131 1132 return get_post_meta( $preview->ID, $meta_key, $single ); 1133 }
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| Generated : Thu Apr 25 08:20:02 2024 | Cross-referenced by PHPXref |