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1 <?php 2 /** 3 * Core Metadata API 4 * 5 * Functions for retrieving and manipulating metadata of various WordPress object types. Metadata 6 * for an object is a represented by a simple key-value pair. Objects may contain multiple 7 * metadata entries that share the same key and differ only in their value. 8 * 9 * @package WordPress 10 * @subpackage Meta 11 */ 12 13 /** 14 * Add metadata for the specified object. 15 * 16 * @since 2.9.0 17 * 18 * @global wpdb $wpdb WordPress database abstraction object. 19 * 20 * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 21 * @param int $object_id ID of the object metadata is for 22 * @param string $meta_key Metadata key 23 * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. 24 * @param bool $unique Optional, default is false. 25 * Whether the specified metadata key should be unique for the object. 26 * If true, and the object already has a value for the specified metadata key, 27 * no change will be made. 28 * @return int|false The meta ID on success, false on failure. 29 */ 30 function add_metadata( $meta_type, $object_id, $meta_key, $meta_value, $unique = false ) { 31 global $wpdb; 32 33 if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) ) { 34 return false; 35 } 36 37 $object_id = absint( $object_id ); 38 if ( ! $object_id ) { 39 return false; 40 } 41 42 $table = _get_meta_table( $meta_type ); 43 if ( ! $table ) { 44 return false; 45 } 46 47 $meta_subtype = get_object_subtype( $meta_type, $object_id ); 48 49 $column = sanitize_key( $meta_type . '_id' ); 50 51 // expected_slashed ($meta_key) 52 $meta_key = wp_unslash( $meta_key ); 53 $meta_value = wp_unslash( $meta_value ); 54 $meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type, $meta_subtype ); 55 56 /** 57 * Filters whether to add metadata of a specific type. 58 * 59 * The dynamic portion of the hook, `$meta_type`, refers to the meta 60 * object type (comment, post, term, or user). Returning a non-null value 61 * will effectively short-circuit the function. 62 * 63 * @since 3.1.0 64 * 65 * @param null|bool $check Whether to allow adding metadata for the given type. 66 * @param int $object_id Object ID. 67 * @param string $meta_key Meta key. 68 * @param mixed $meta_value Meta value. Must be serializable if non-scalar. 69 * @param bool $unique Whether the specified meta key should be unique 70 * for the object. Optional. Default false. 71 */ 72 $check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique ); 73 if ( null !== $check ) { 74 return $check; 75 } 76 77 if ( $unique && $wpdb->get_var( 78 $wpdb->prepare( 79 "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d", 80 $meta_key, 81 $object_id 82 ) 83 ) ) { 84 return false; 85 } 86 87 $_meta_value = $meta_value; 88 $meta_value = maybe_serialize( $meta_value ); 89 90 /** 91 * Fires immediately before meta of a specific type is added. 92 * 93 * The dynamic portion of the hook, `$meta_type`, refers to the meta 94 * object type (comment, post, term, or user). 95 * 96 * @since 3.1.0 97 * 98 * @param int $object_id Object ID. 99 * @param string $meta_key Meta key. 100 * @param mixed $_meta_value Meta value. 101 */ 102 do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value ); 103 104 $result = $wpdb->insert( 105 $table, 106 array( 107 $column => $object_id, 108 'meta_key' => $meta_key, 109 'meta_value' => $meta_value, 110 ) 111 ); 112 113 if ( ! $result ) { 114 return false; 115 } 116 117 $mid = (int) $wpdb->insert_id; 118 119 wp_cache_delete( $object_id, $meta_type . '_meta' ); 120 121 /** 122 * Fires immediately after meta of a specific type is added. 123 * 124 * The dynamic portion of the hook, `$meta_type`, refers to the meta 125 * object type (comment, post, term, or user). 126 * 127 * @since 2.9.0 128 * 129 * @param int $mid The meta ID after successful update. 130 * @param int $object_id Object ID. 131 * @param string $meta_key Meta key. 132 * @param mixed $_meta_value Meta value. 133 */ 134 do_action( "added_{$meta_type}_meta", $mid, $object_id, $meta_key, $_meta_value ); 135 136 return $mid; 137 } 138 139 /** 140 * Update metadata for the specified object. If no value already exists for the specified object 141 * ID and metadata key, the metadata will be added. 142 * 143 * @since 2.9.0 144 * 145 * @global wpdb $wpdb WordPress database abstraction object. 146 * 147 * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 148 * @param int $object_id ID of the object metadata is for 149 * @param string $meta_key Metadata key 150 * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. 151 * @param mixed $prev_value Optional. If specified, only update existing metadata entries with 152 * the specified value. Otherwise, update all entries. 153 * @return int|bool The new meta field ID if a field with the given key didn't exist and was 154 * therefore added, true on successful update, false on failure. 155 */ 156 function update_metadata( $meta_type, $object_id, $meta_key, $meta_value, $prev_value = '' ) { 157 global $wpdb; 158 159 if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) ) { 160 return false; 161 } 162 163 $object_id = absint( $object_id ); 164 if ( ! $object_id ) { 165 return false; 166 } 167 168 $table = _get_meta_table( $meta_type ); 169 if ( ! $table ) { 170 return false; 171 } 172 173 $meta_subtype = get_object_subtype( $meta_type, $object_id ); 174 175 $column = sanitize_key( $meta_type . '_id' ); 176 $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; 177 178 // expected_slashed ($meta_key) 179 $raw_meta_key = $meta_key; 180 $meta_key = wp_unslash( $meta_key ); 181 $passed_value = $meta_value; 182 $meta_value = wp_unslash( $meta_value ); 183 $meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type, $meta_subtype ); 184 185 /** 186 * Filters whether to update metadata of a specific type. 187 * 188 * The dynamic portion of the hook, `$meta_type`, refers to the meta 189 * object type (comment, post, term, or user). Returning a non-null value 190 * will effectively short-circuit the function. 191 * 192 * @since 3.1.0 193 * 194 * @param null|bool $check Whether to allow updating metadata for the given type. 195 * @param int $object_id Object ID. 196 * @param string $meta_key Meta key. 197 * @param mixed $meta_value Meta value. Must be serializable if non-scalar. 198 * @param mixed $prev_value Optional. If specified, only update existing 199 * metadata entries with the specified value. 200 * Otherwise, update all entries. 201 */ 202 $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value ); 203 if ( null !== $check ) { 204 return (bool) $check; 205 } 206 207 // Compare existing value to new value if no prev value given and the key exists only once. 208 if ( empty( $prev_value ) ) { 209 $old_value = get_metadata( $meta_type, $object_id, $meta_key ); 210 if ( count( $old_value ) == 1 ) { 211 if ( $old_value[0] === $meta_value ) { 212 return false; 213 } 214 } 215 } 216 217 $meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) ); 218 if ( empty( $meta_ids ) ) { 219 return add_metadata( $meta_type, $object_id, $raw_meta_key, $passed_value ); 220 } 221 222 $_meta_value = $meta_value; 223 $meta_value = maybe_serialize( $meta_value ); 224 225 $data = compact( 'meta_value' ); 226 $where = array( 227 $column => $object_id, 228 'meta_key' => $meta_key, 229 ); 230 231 if ( ! empty( $prev_value ) ) { 232 $prev_value = maybe_serialize( $prev_value ); 233 $where['meta_value'] = $prev_value; 234 } 235 236 foreach ( $meta_ids as $meta_id ) { 237 /** 238 * Fires immediately before updating metadata of a specific type. 239 * 240 * The dynamic portion of the hook, `$meta_type`, refers to the meta 241 * object type (comment, post, term, or user). 242 * 243 * @since 2.9.0 244 * 245 * @param int $meta_id ID of the metadata entry to update. 246 * @param int $object_id Object ID. 247 * @param string $meta_key Meta key. 248 * @param mixed $_meta_value Meta value. 249 */ 250 do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); 251 252 if ( 'post' == $meta_type ) { 253 /** 254 * Fires immediately before updating a post's metadata. 255 * 256 * @since 2.9.0 257 * 258 * @param int $meta_id ID of metadata entry to update. 259 * @param int $object_id Post ID. 260 * @param string $meta_key Meta key. 261 * @param mixed $meta_value Meta value. This will be a PHP-serialized string representation of the value if 262 * the value is an array, an object, or itself a PHP-serialized string. 263 */ 264 do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); 265 } 266 } 267 268 $result = $wpdb->update( $table, $data, $where ); 269 if ( ! $result ) { 270 return false; 271 } 272 273 wp_cache_delete( $object_id, $meta_type . '_meta' ); 274 275 foreach ( $meta_ids as $meta_id ) { 276 /** 277 * Fires immediately after updating metadata of a specific type. 278 * 279 * The dynamic portion of the hook, `$meta_type`, refers to the meta 280 * object type (comment, post, term, or user). 281 * 282 * @since 2.9.0 283 * 284 * @param int $meta_id ID of updated metadata entry. 285 * @param int $object_id Object ID. 286 * @param string $meta_key Meta key. 287 * @param mixed $_meta_value Meta value. 288 */ 289 do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); 290 291 if ( 'post' == $meta_type ) { 292 /** 293 * Fires immediately after updating a post's metadata. 294 * 295 * @since 2.9.0 296 * 297 * @param int $meta_id ID of updated metadata entry. 298 * @param int $object_id Post ID. 299 * @param string $meta_key Meta key. 300 * @param mixed $meta_value Meta value. This will be a PHP-serialized string representation of the value if 301 * the value is an array, an object, or itself a PHP-serialized string. 302 */ 303 do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); 304 } 305 } 306 307 return true; 308 } 309 310 /** 311 * Delete metadata for the specified object. 312 * 313 * @since 2.9.0 314 * 315 * @global wpdb $wpdb WordPress database abstraction object. 316 * 317 * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 318 * @param int $object_id ID of the object metadata is for 319 * @param string $meta_key Metadata key 320 * @param mixed $meta_value Optional. Metadata value. Must be serializable if non-scalar. If specified, only delete 321 * metadata entries with this value. Otherwise, delete all entries with the specified meta_key. 322 * Pass `null`, `false`, or an empty string to skip this check. (For backward compatibility, 323 * it is not possible to pass an empty string to delete those entries with an empty string 324 * for a value.) 325 * @param bool $delete_all Optional, default is false. If true, delete matching metadata entries for all objects, 326 * ignoring the specified object_id. Otherwise, only delete matching metadata entries for 327 * the specified object_id. 328 * @return bool True on successful delete, false on failure. 329 */ 330 function delete_metadata( $meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false ) { 331 global $wpdb; 332 333 if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) && ! $delete_all ) { 334 return false; 335 } 336 337 $object_id = absint( $object_id ); 338 if ( ! $object_id && ! $delete_all ) { 339 return false; 340 } 341 342 $table = _get_meta_table( $meta_type ); 343 if ( ! $table ) { 344 return false; 345 } 346 347 $type_column = sanitize_key( $meta_type . '_id' ); 348 $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; 349 // expected_slashed ($meta_key) 350 $meta_key = wp_unslash( $meta_key ); 351 $meta_value = wp_unslash( $meta_value ); 352 353 /** 354 * Filters whether to delete metadata of a specific type. 355 * 356 * The dynamic portion of the hook, `$meta_type`, refers to the meta 357 * object type (comment, post, term, or user). Returning a non-null value 358 * will effectively short-circuit the function. 359 * 360 * @since 3.1.0 361 * 362 * @param null|bool $delete Whether to allow metadata deletion of the given type. 363 * @param int $object_id Object ID. 364 * @param string $meta_key Meta key. 365 * @param mixed $meta_value Meta value. Must be serializable if non-scalar. 366 * @param bool $delete_all Whether to delete the matching metadata entries 367 * for all objects, ignoring the specified $object_id. 368 * Default false. 369 */ 370 $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all ); 371 if ( null !== $check ) { 372 return (bool) $check; 373 } 374 375 $_meta_value = $meta_value; 376 $meta_value = maybe_serialize( $meta_value ); 377 378 $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key ); 379 380 if ( ! $delete_all ) { 381 $query .= $wpdb->prepare( " AND $type_column = %d", $object_id ); 382 } 383 384 if ( '' !== $meta_value && null !== $meta_value && false !== $meta_value ) { 385 $query .= $wpdb->prepare( ' AND meta_value = %s', $meta_value ); 386 } 387 388 $meta_ids = $wpdb->get_col( $query ); 389 if ( ! count( $meta_ids ) ) { 390 return false; 391 } 392 393 if ( $delete_all ) { 394 if ( '' !== $meta_value && null !== $meta_value && false !== $meta_value ) { 395 $object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s AND meta_value = %s", $meta_key, $meta_value ) ); 396 } else { 397 $object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) ); 398 } 399 } 400 401 /** 402 * Fires immediately before deleting metadata of a specific type. 403 * 404 * The dynamic portion of the hook, `$meta_type`, refers to the meta 405 * object type (comment, post, term, or user). 406 * 407 * @since 3.1.0 408 * 409 * @param array $meta_ids An array of metadata entry IDs to delete. 410 * @param int $object_id Object ID. 411 * @param string $meta_key Meta key. 412 * @param mixed $_meta_value Meta value. 413 */ 414 do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); 415 416 // Old-style action. 417 if ( 'post' == $meta_type ) { 418 /** 419 * Fires immediately before deleting metadata for a post. 420 * 421 * @since 2.9.0 422 * 423 * @param array $meta_ids An array of post metadata entry IDs to delete. 424 */ 425 do_action( 'delete_postmeta', $meta_ids ); 426 } 427 428 $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . ' )'; 429 430 $count = $wpdb->query( $query ); 431 432 if ( ! $count ) { 433 return false; 434 } 435 436 if ( $delete_all ) { 437 foreach ( (array) $object_ids as $o_id ) { 438 wp_cache_delete( $o_id, $meta_type . '_meta' ); 439 } 440 } else { 441 wp_cache_delete( $object_id, $meta_type . '_meta' ); 442 } 443 444 /** 445 * Fires immediately after deleting metadata of a specific type. 446 * 447 * The dynamic portion of the hook name, `$meta_type`, refers to the meta 448 * object type (comment, post, term, or user). 449 * 450 * @since 2.9.0 451 * 452 * @param array $meta_ids An array of deleted metadata entry IDs. 453 * @param int $object_id Object ID. 454 * @param string $meta_key Meta key. 455 * @param mixed $_meta_value Meta value. 456 */ 457 do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); 458 459 // Old-style action. 460 if ( 'post' == $meta_type ) { 461 /** 462 * Fires immediately after deleting metadata for a post. 463 * 464 * @since 2.9.0 465 * 466 * @param array $meta_ids An array of deleted post metadata entry IDs. 467 */ 468 do_action( 'deleted_postmeta', $meta_ids ); 469 } 470 471 return true; 472 } 473 474 /** 475 * Retrieve metadata for the specified object. 476 * 477 * @since 2.9.0 478 * 479 * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 480 * @param int $object_id ID of the object metadata is for 481 * @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for 482 * the specified object. 483 * @param bool $single Optional, default is false. 484 * If true, return only the first value of the specified meta_key. 485 * This parameter has no effect if meta_key is not specified. 486 * @return mixed Single metadata value, or array of values 487 */ 488 function get_metadata( $meta_type, $object_id, $meta_key = '', $single = false ) { 489 if ( ! $meta_type || ! is_numeric( $object_id ) ) { 490 return false; 491 } 492 493 $object_id = absint( $object_id ); 494 if ( ! $object_id ) { 495 return false; 496 } 497 498 /** 499 * Filters whether to retrieve metadata of a specific type. 500 * 501 * The dynamic portion of the hook, `$meta_type`, refers to the meta 502 * object type (comment, post, term, or user). Returning a non-null value 503 * will effectively short-circuit the function. 504 * 505 * @since 3.1.0 506 * 507 * @param null|array|string $value The value get_metadata() should return - a single metadata value, 508 * or an array of values. 509 * @param int $object_id Object ID. 510 * @param string $meta_key Meta key. 511 * @param bool $single Whether to return only the first value of the specified $meta_key. 512 */ 513 $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single ); 514 if ( null !== $check ) { 515 if ( $single && is_array( $check ) ) { 516 return $check[0]; 517 } else { 518 return $check; 519 } 520 } 521 522 $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); 523 524 if ( ! $meta_cache ) { 525 $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); 526 if ( isset( $meta_cache[ $object_id ] ) ) { 527 $meta_cache = $meta_cache[ $object_id ]; 528 } else { 529 $meta_cache = null; 530 } 531 } 532 533 if ( ! $meta_key ) { 534 return $meta_cache; 535 } 536 537 if ( isset( $meta_cache[ $meta_key ] ) ) { 538 if ( $single ) { 539 return maybe_unserialize( $meta_cache[ $meta_key ][0] ); 540 } else { 541 return array_map( 'maybe_unserialize', $meta_cache[ $meta_key ] ); 542 } 543 } 544 545 if ( $single ) { 546 return ''; 547 } else { 548 return array(); 549 } 550 } 551 552 /** 553 * Determine if a meta key is set for a given object 554 * 555 * @since 3.3.0 556 * 557 * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 558 * @param int $object_id ID of the object metadata is for 559 * @param string $meta_key Metadata key. 560 * @return bool True of the key is set, false if not. 561 */ 562 function metadata_exists( $meta_type, $object_id, $meta_key ) { 563 if ( ! $meta_type || ! is_numeric( $object_id ) ) { 564 return false; 565 } 566 567 $object_id = absint( $object_id ); 568 if ( ! $object_id ) { 569 return false; 570 } 571 572 /** This filter is documented in wp-includes/meta.php */ 573 $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true ); 574 if ( null !== $check ) { 575 return (bool) $check; 576 } 577 578 $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); 579 580 if ( ! $meta_cache ) { 581 $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); 582 $meta_cache = $meta_cache[ $object_id ]; 583 } 584 585 if ( isset( $meta_cache[ $meta_key ] ) ) { 586 return true; 587 } 588 589 return false; 590 } 591 592 /** 593 * Get meta data by meta ID 594 * 595 * @since 3.3.0 596 * 597 * @global wpdb $wpdb WordPress database abstraction object. 598 * 599 * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 600 * @param int $meta_id ID for a specific meta row 601 * @return object|false Meta object or false. 602 */ 603 function get_metadata_by_mid( $meta_type, $meta_id ) { 604 global $wpdb; 605 606 if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) { 607 return false; 608 } 609 610 $meta_id = intval( $meta_id ); 611 if ( $meta_id <= 0 ) { 612 return false; 613 } 614 615 $table = _get_meta_table( $meta_type ); 616 if ( ! $table ) { 617 return false; 618 } 619 620 $id_column = ( 'user' == $meta_type ) ? 'umeta_id' : 'meta_id'; 621 622 /** 623 * Filters whether to retrieve metadata of a specific type by meta ID. 624 * 625 * The dynamic portion of the hook, `$meta_type`, refers to the meta 626 * object type (comment, post, term, or user). Returning a non-null value 627 * will effectively short-circuit the function. 628 * 629 * @since 5.0.0 630 * 631 * @param mixed $value The value get_metadata_by_mid() should return. 632 * @param int $meta_id Meta ID. 633 */ 634 $check = apply_filters( "get_{$meta_type}_metadata_by_mid", null, $meta_id ); 635 if ( null !== $check ) { 636 return $check; 637 } 638 639 $meta = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table WHERE $id_column = %d", $meta_id ) ); 640 641 if ( empty( $meta ) ) { 642 return false; 643 } 644 645 if ( isset( $meta->meta_value ) ) { 646 $meta->meta_value = maybe_unserialize( $meta->meta_value ); 647 } 648 649 return $meta; 650 } 651 652 /** 653 * Update meta data by meta ID 654 * 655 * @since 3.3.0 656 * 657 * @global wpdb $wpdb WordPress database abstraction object. 658 * 659 * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 660 * @param int $meta_id ID for a specific meta row 661 * @param string $meta_value Metadata value 662 * @param string $meta_key Optional, you can provide a meta key to update it 663 * @return bool True on successful update, false on failure. 664 */ 665 function update_metadata_by_mid( $meta_type, $meta_id, $meta_value, $meta_key = false ) { 666 global $wpdb; 667 668 // Make sure everything is valid. 669 if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) { 670 return false; 671 } 672 673 $meta_id = intval( $meta_id ); 674 if ( $meta_id <= 0 ) { 675 return false; 676 } 677 678 $table = _get_meta_table( $meta_type ); 679 if ( ! $table ) { 680 return false; 681 } 682 683 $column = sanitize_key( $meta_type . '_id' ); 684 $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; 685 686 /** 687 * Filters whether to update metadata of a specific type by meta ID. 688 * 689 * The dynamic portion of the hook, `$meta_type`, refers to the meta 690 * object type (comment, post, term, or user). Returning a non-null value 691 * will effectively short-circuit the function. 692 * 693 * @since 5.0.0 694 * 695 * @param null|bool $check Whether to allow updating metadata for the given type. 696 * @param int $meta_id Meta ID. 697 * @param mixed $meta_value Meta value. Must be serializable if non-scalar. 698 * @param string|bool $meta_key Meta key, if provided. 699 */ 700 $check = apply_filters( "update_{$meta_type}_metadata_by_mid", null, $meta_id, $meta_value, $meta_key ); 701 if ( null !== $check ) { 702 return (bool) $check; 703 } 704 705 // Fetch the meta and go on if it's found. 706 $meta = get_metadata_by_mid( $meta_type, $meta_id ); 707 if ( $meta ) { 708 $original_key = $meta->meta_key; 709 $object_id = $meta->{$column}; 710 711 // If a new meta_key (last parameter) was specified, change the meta key, 712 // otherwise use the original key in the update statement. 713 if ( false === $meta_key ) { 714 $meta_key = $original_key; 715 } elseif ( ! is_string( $meta_key ) ) { 716 return false; 717 } 718 719 $meta_subtype = get_object_subtype( $meta_type, $object_id ); 720 721 // Sanitize the meta 722 $_meta_value = $meta_value; 723 $meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type, $meta_subtype ); 724 $meta_value = maybe_serialize( $meta_value ); 725 726 // Format the data query arguments. 727 $data = array( 728 'meta_key' => $meta_key, 729 'meta_value' => $meta_value, 730 ); 731 732 // Format the where query arguments. 733 $where = array(); 734 $where[ $id_column ] = $meta_id; 735 736 /** This action is documented in wp-includes/meta.php */ 737 do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); 738 739 if ( 'post' == $meta_type ) { 740 /** This action is documented in wp-includes/meta.php */ 741 do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); 742 } 743 744 // Run the update query, all fields in $data are %s, $where is a %d. 745 $result = $wpdb->update( $table, $data, $where, '%s', '%d' ); 746 if ( ! $result ) { 747 return false; 748 } 749 750 // Clear the caches. 751 wp_cache_delete( $object_id, $meta_type . '_meta' ); 752 753 /** This action is documented in wp-includes/meta.php */ 754 do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); 755 756 if ( 'post' == $meta_type ) { 757 /** This action is documented in wp-includes/meta.php */ 758 do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); 759 } 760 761 return true; 762 } 763 764 // And if the meta was not found. 765 return false; 766 } 767 768 /** 769 * Delete meta data by meta ID 770 * 771 * @since 3.3.0 772 * 773 * @global wpdb $wpdb WordPress database abstraction object. 774 * 775 * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 776 * @param int $meta_id ID for a specific meta row 777 * @return bool True on successful delete, false on failure. 778 */ 779 function delete_metadata_by_mid( $meta_type, $meta_id ) { 780 global $wpdb; 781 782 // Make sure everything is valid. 783 if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) { 784 return false; 785 } 786 787 $meta_id = intval( $meta_id ); 788 if ( $meta_id <= 0 ) { 789 return false; 790 } 791 792 $table = _get_meta_table( $meta_type ); 793 if ( ! $table ) { 794 return false; 795 } 796 797 // object and id columns 798 $column = sanitize_key( $meta_type . '_id' ); 799 $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; 800 801 /** 802 * Filters whether to delete metadata of a specific type by meta ID. 803 * 804 * The dynamic portion of the hook, `$meta_type`, refers to the meta 805 * object type (comment, post, term, or user). Returning a non-null value 806 * will effectively short-circuit the function. 807 * 808 * @since 5.0.0 809 * 810 * @param null|bool $delete Whether to allow metadata deletion of the given type. 811 * @param int $meta_id Meta ID. 812 */ 813 $check = apply_filters( "delete_{$meta_type}_metadata_by_mid", null, $meta_id ); 814 if ( null !== $check ) { 815 return (bool) $check; 816 } 817 818 // Fetch the meta and go on if it's found. 819 $meta = get_metadata_by_mid( $meta_type, $meta_id ); 820 if ( $meta ) { 821 $object_id = (int) $meta->{$column}; 822 823 /** This action is documented in wp-includes/meta.php */ 824 do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); 825 826 // Old-style action. 827 if ( 'post' == $meta_type || 'comment' == $meta_type ) { 828 /** 829 * Fires immediately before deleting post or comment metadata of a specific type. 830 * 831 * The dynamic portion of the hook, `$meta_type`, refers to the meta 832 * object type (post or comment). 833 * 834 * @since 3.4.0 835 * 836 * @param int $meta_id ID of the metadata entry to delete. 837 */ 838 do_action( "delete_{$meta_type}meta", $meta_id ); 839 } 840 841 // Run the query, will return true if deleted, false otherwise 842 $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); 843 844 // Clear the caches. 845 wp_cache_delete( $object_id, $meta_type . '_meta' ); 846 847 /** This action is documented in wp-includes/meta.php */ 848 do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); 849 850 // Old-style action. 851 if ( 'post' == $meta_type || 'comment' == $meta_type ) { 852 /** 853 * Fires immediately after deleting post or comment metadata of a specific type. 854 * 855 * The dynamic portion of the hook, `$meta_type`, refers to the meta 856 * object type (post or comment). 857 * 858 * @since 3.4.0 859 * 860 * @param int $meta_ids Deleted metadata entry ID. 861 */ 862 do_action( "deleted_{$meta_type}meta", $meta_id ); 863 } 864 865 return $result; 866 867 } 868 869 // Meta id was not found. 870 return false; 871 } 872 873 /** 874 * Update the metadata cache for the specified objects. 875 * 876 * @since 2.9.0 877 * 878 * @global wpdb $wpdb WordPress database abstraction object. 879 * 880 * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 881 * @param string|int[] $object_ids Array or comma delimited list of object IDs to update cache for. 882 * @return array|false Metadata cache for the specified objects, or false on failure. 883 */ 884 function update_meta_cache( $meta_type, $object_ids ) { 885 global $wpdb; 886 887 if ( ! $meta_type || ! $object_ids ) { 888 return false; 889 } 890 891 $table = _get_meta_table( $meta_type ); 892 if ( ! $table ) { 893 return false; 894 } 895 896 $column = sanitize_key( $meta_type . '_id' ); 897 898 if ( ! is_array( $object_ids ) ) { 899 $object_ids = preg_replace( '|[^0-9,]|', '', $object_ids ); 900 $object_ids = explode( ',', $object_ids ); 901 } 902 903 $object_ids = array_map( 'intval', $object_ids ); 904 905 /** 906 * Filters whether to update the metadata cache of a specific type. 907 * 908 * The dynamic portion of the hook, `$meta_type`, refers to the meta 909 * object type (comment, post, term, or user). Returning a non-null value 910 * will effectively short-circuit the function. 911 * 912 * @since 5.0.0 913 * 914 * @param mixed $check Whether to allow updating the meta cache of the given type. 915 * @param int[] $object_ids Array of object IDs to update the meta cache for. 916 */ 917 $check = apply_filters( "update_{$meta_type}_metadata_cache", null, $object_ids ); 918 if ( null !== $check ) { 919 return (bool) $check; 920 } 921 922 $cache_key = $meta_type . '_meta'; 923 $ids = array(); 924 $cache = array(); 925 foreach ( $object_ids as $id ) { 926 $cached_object = wp_cache_get( $id, $cache_key ); 927 if ( false === $cached_object ) { 928 $ids[] = $id; 929 } else { 930 $cache[ $id ] = $cached_object; 931 } 932 } 933 934 if ( empty( $ids ) ) { 935 return $cache; 936 } 937 938 // Get meta info 939 $id_list = join( ',', $ids ); 940 $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; 941 $meta_list = $wpdb->get_results( "SELECT $column, meta_key, meta_value FROM $table WHERE $column IN ($id_list) ORDER BY $id_column ASC", ARRAY_A ); 942 943 if ( ! empty( $meta_list ) ) { 944 foreach ( $meta_list as $metarow ) { 945 $mpid = intval( $metarow[ $column ] ); 946 $mkey = $metarow['meta_key']; 947 $mval = $metarow['meta_value']; 948 949 // Force subkeys to be array type: 950 if ( ! isset( $cache[ $mpid ] ) || ! is_array( $cache[ $mpid ] ) ) { 951 $cache[ $mpid ] = array(); 952 } 953 if ( ! isset( $cache[ $mpid ][ $mkey ] ) || ! is_array( $cache[ $mpid ][ $mkey ] ) ) { 954 $cache[ $mpid ][ $mkey ] = array(); 955 } 956 957 // Add a value to the current pid/key: 958 $cache[ $mpid ][ $mkey ][] = $mval; 959 } 960 } 961 962 foreach ( $ids as $id ) { 963 if ( ! isset( $cache[ $id ] ) ) { 964 $cache[ $id ] = array(); 965 } 966 wp_cache_add( $id, $cache[ $id ], $cache_key ); 967 } 968 969 return $cache; 970 } 971 972 /** 973 * Retrieves the queue for lazy-loading metadata. 974 * 975 * @since 4.5.0 976 * 977 * @return WP_Metadata_Lazyloader $lazyloader Metadata lazyloader queue. 978 */ 979 function wp_metadata_lazyloader() { 980 static $wp_metadata_lazyloader; 981 982 if ( null === $wp_metadata_lazyloader ) { 983 $wp_metadata_lazyloader = new WP_Metadata_Lazyloader(); 984 } 985 986 return $wp_metadata_lazyloader; 987 } 988 989 /** 990 * Given a meta query, generates SQL clauses to be appended to a main query. 991 * 992 * @since 3.2.0 993 * 994 * @see WP_Meta_Query 995 * 996 * @param array $meta_query A meta query. 997 * @param string $type Type of meta. 998 * @param string $primary_table Primary database table name. 999 * @param string $primary_id_column Primary ID column name. 1000 * @param object $context Optional. The main query object 1001 * @return array Associative array of `JOIN` and `WHERE` SQL. 1002 */ 1003 function get_meta_sql( $meta_query, $type, $primary_table, $primary_id_column, $context = null ) { 1004 $meta_query_obj = new WP_Meta_Query( $meta_query ); 1005 return $meta_query_obj->get_sql( $type, $primary_table, $primary_id_column, $context ); 1006 } 1007 1008 /** 1009 * Retrieve the name of the metadata table for the specified object type. 1010 * 1011 * @since 2.9.0 1012 * 1013 * @global wpdb $wpdb WordPress database abstraction object. 1014 * 1015 * @param string $type Type of object to get metadata table for (e.g., comment, post, term, or user). 1016 * @return string|false Metadata table name, or false if no metadata table exists 1017 */ 1018 function _get_meta_table( $type ) { 1019 global $wpdb; 1020 1021 $table_name = $type . 'meta'; 1022 1023 if ( empty( $wpdb->$table_name ) ) { 1024 return false; 1025 } 1026 1027 return $wpdb->$table_name; 1028 } 1029 1030 /** 1031 * Determines whether a meta key is considered protected. 1032 * 1033 * @since 3.1.3 1034 * 1035 * @param string $meta_key Meta key. 1036 * @param string|null $meta_type Optional. Type of object metadata is for (e.g., comment, post, term, or user). 1037 * @return bool Whether the meta key is considered protected. 1038 */ 1039 function is_protected_meta( $meta_key, $meta_type = null ) { 1040 $protected = ( '_' == $meta_key[0] ); 1041 1042 /** 1043 * Filters whether a meta key is considered protected. 1044 * 1045 * @since 3.2.0 1046 * 1047 * @param bool $protected Whether the key is considered protected. 1048 * @param string $meta_key Meta key. 1049 * @param string|null $meta_type Type of object metadata is for (e.g., comment, post, term, or user). 1050 */ 1051 return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); 1052 } 1053 1054 /** 1055 * Sanitize meta value. 1056 * 1057 * @since 3.1.3 1058 * @since 4.9.8 The `$object_subtype` parameter was added. 1059 * 1060 * @param string $meta_key Meta key. 1061 * @param mixed $meta_value Meta value to sanitize. 1062 * @param string $object_type Type of object the meta is registered to. 1063 * @param string $object_subtype Optional. The subtype of the object type. 1064 * 1065 * @return mixed Sanitized $meta_value. 1066 */ 1067 function sanitize_meta( $meta_key, $meta_value, $object_type, $object_subtype = '' ) { 1068 if ( ! empty( $object_subtype ) && has_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}" ) ) { 1069 1070 /** 1071 * Filters the sanitization of a specific meta key of a specific meta type and subtype. 1072 * 1073 * The dynamic portions of the hook name, `$object_type`, `$meta_key`, 1074 * and `$object_subtype`, refer to the metadata object type (comment, post, term, or user), 1075 * the meta key value, and the object subtype respectively. 1076 * 1077 * @since 4.9.8 1078 * 1079 * @param mixed $meta_value Meta value to sanitize. 1080 * @param string $meta_key Meta key. 1081 * @param string $object_type Object type. 1082 * @param string $object_subtype Object subtype. 1083 */ 1084 return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $meta_value, $meta_key, $object_type, $object_subtype ); 1085 } 1086 1087 /** 1088 * Filters the sanitization of a specific meta key of a specific meta type. 1089 * 1090 * The dynamic portions of the hook name, `$meta_type`, and `$meta_key`, 1091 * refer to the metadata object type (comment, post, term, or user) and the meta 1092 * key value, respectively. 1093 * 1094 * @since 3.3.0 1095 * 1096 * @param mixed $meta_value Meta value to sanitize. 1097 * @param string $meta_key Meta key. 1098 * @param string $object_type Object type. 1099 */ 1100 return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}", $meta_value, $meta_key, $object_type ); 1101 } 1102 1103 /** 1104 * Registers a meta key. 1105 * 1106 * It is recommended to register meta keys for a specific combination of object type and object subtype. If passing 1107 * an object subtype is omitted, the meta key will be registered for the entire object type, however it can be partly 1108 * overridden in case a more specific meta key of the same name exists for the same object type and a subtype. 1109 * 1110 * If an object type does not support any subtypes, such as users or comments, you should commonly call this function 1111 * without passing a subtype. 1112 * 1113 * @since 3.3.0 1114 * @since 4.6.0 {@link https://core.trac.wordpress.org/ticket/35658 Modified 1115 * to support an array of data to attach to registered meta keys}. Previous arguments for 1116 * `$sanitize_callback` and `$auth_callback` have been folded into this array. 1117 * @since 4.9.8 The `$object_subtype` argument was added to the arguments array. 1118 * 1119 * @param string $object_type Type of object this meta is registered to. 1120 * @param string $meta_key Meta key to register. 1121 * @param array $args { 1122 * Data used to describe the meta key when registered. 1123 * 1124 * @type string $object_subtype A subtype; e.g. if the object type is "post", the post type. If left empty, 1125 * the meta key will be registered on the entire object type. Default empty. 1126 * @type string $type The type of data associated with this meta key. 1127 * Valid values are 'string', 'boolean', 'integer', and 'number'. 1128 * @type string $description A description of the data attached to this meta key. 1129 * @type bool $single Whether the meta key has one value per object, or an array of values per object. 1130 * @type string $sanitize_callback A function or method to call when sanitizing `$meta_key` data. 1131 * @type string $auth_callback Optional. A function or method to call when performing edit_post_meta, add_post_meta, and delete_post_meta capability checks. 1132 * @type bool $show_in_rest Whether data associated with this meta key can be considered public and 1133 * should be accessible via the REST API. A custom post type must also declare 1134 * support for custom fields for registered meta to be accessible via REST. 1135 * } 1136 * @param string|array $deprecated Deprecated. Use `$args` instead. 1137 * 1138 * @return bool True if the meta key was successfully registered in the global array, false if not. 1139 * Registering a meta key with distinct sanitize and auth callbacks will fire those 1140 * callbacks, but will not add to the global registry. 1141 */ 1142 function register_meta( $object_type, $meta_key, $args, $deprecated = null ) { 1143 global $wp_meta_keys; 1144 1145 if ( ! is_array( $wp_meta_keys ) ) { 1146 $wp_meta_keys = array(); 1147 } 1148 1149 $defaults = array( 1150 'object_subtype' => '', 1151 'type' => 'string', 1152 'description' => '', 1153 'single' => false, 1154 'sanitize_callback' => null, 1155 'auth_callback' => null, 1156 'show_in_rest' => false, 1157 ); 1158 1159 // There used to be individual args for sanitize and auth callbacks 1160 $has_old_sanitize_cb = false; 1161 $has_old_auth_cb = false; 1162 1163 if ( is_callable( $args ) ) { 1164 $args = array( 1165 'sanitize_callback' => $args, 1166 ); 1167 1168 $has_old_sanitize_cb = true; 1169 } else { 1170 $args = (array) $args; 1171 } 1172 1173 if ( is_callable( $deprecated ) ) { 1174 $args['auth_callback'] = $deprecated; 1175 $has_old_auth_cb = true; 1176 } 1177 1178 /** 1179 * Filters the registration arguments when registering meta. 1180 * 1181 * @since 4.6.0 1182 * 1183 * @param array $args Array of meta registration arguments. 1184 * @param array $defaults Array of default arguments. 1185 * @param string $object_type Object type. 1186 * @param string $meta_key Meta key. 1187 */ 1188 $args = apply_filters( 'register_meta_args', $args, $defaults, $object_type, $meta_key ); 1189 $args = wp_parse_args( $args, $defaults ); 1190 1191 $object_subtype = ! empty( $args['object_subtype'] ) ? $args['object_subtype'] : ''; 1192 1193 // If `auth_callback` is not provided, fall back to `is_protected_meta()`. 1194 if ( empty( $args['auth_callback'] ) ) { 1195 if ( is_protected_meta( $meta_key, $object_type ) ) { 1196 $args['auth_callback'] = '__return_false'; 1197 } else { 1198 $args['auth_callback'] = '__return_true'; 1199 } 1200 } 1201 1202 // Back-compat: old sanitize and auth callbacks are applied to all of an object type. 1203 if ( is_callable( $args['sanitize_callback'] ) ) { 1204 if ( ! empty( $object_subtype ) ) { 1205 add_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'], 10, 4 ); 1206 } else { 1207 add_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'], 10, 3 ); 1208 } 1209 } 1210 1211 if ( is_callable( $args['auth_callback'] ) ) { 1212 if ( ! empty( $object_subtype ) ) { 1213 add_filter( "auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['auth_callback'], 10, 6 ); 1214 } else { 1215 add_filter( "auth_{$object_type}_meta_{$meta_key}", $args['auth_callback'], 10, 6 ); 1216 } 1217 } 1218 1219 // Global registry only contains meta keys registered with the array of arguments added in 4.6.0. 1220 if ( ! $has_old_auth_cb && ! $has_old_sanitize_cb ) { 1221 unset( $args['object_subtype'] ); 1222 1223 $wp_meta_keys[ $object_type ][ $object_subtype ][ $meta_key ] = $args; 1224 1225 return true; 1226 } 1227 1228 return false; 1229 } 1230 1231 /** 1232 * Checks if a meta key is registered. 1233 * 1234 * @since 4.6.0 1235 * @since 4.9.8 The `$object_subtype` parameter was added. 1236 * 1237 * @param string $object_type The type of object. 1238 * @param string $meta_key The meta key. 1239 * @param string $object_subtype Optional. The subtype of the object type. 1240 * 1241 * @return bool True if the meta key is registered to the object type and, if provided, 1242 * the object subtype. False if not. 1243 */ 1244 function registered_meta_key_exists( $object_type, $meta_key, $object_subtype = '' ) { 1245 $meta_keys = get_registered_meta_keys( $object_type, $object_subtype ); 1246 1247 return isset( $meta_keys[ $meta_key ] ); 1248 } 1249 1250 /** 1251 * Unregisters a meta key from the list of registered keys. 1252 * 1253 * @since 4.6.0 1254 * @since 4.9.8 The `$object_subtype` parameter was added. 1255 * 1256 * @param string $object_type The type of object. 1257 * @param string $meta_key The meta key. 1258 * @param string $object_subtype Optional. The subtype of the object type. 1259 * @return bool True if successful. False if the meta key was not registered. 1260 */ 1261 function unregister_meta_key( $object_type, $meta_key, $object_subtype = '' ) { 1262 global $wp_meta_keys; 1263 1264 if ( ! registered_meta_key_exists( $object_type, $meta_key, $object_subtype ) ) { 1265 return false; 1266 } 1267 1268 $args = $wp_meta_keys[ $object_type ][ $object_subtype ][ $meta_key ]; 1269 1270 if ( isset( $args['sanitize_callback'] ) && is_callable( $args['sanitize_callback'] ) ) { 1271 if ( ! empty( $object_subtype ) ) { 1272 remove_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'] ); 1273 } else { 1274 remove_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'] ); 1275 } 1276 } 1277 1278 if ( isset( $args['auth_callback'] ) && is_callable( $args['auth_callback'] ) ) { 1279 if ( ! empty( $object_subtype ) ) { 1280 remove_filter( "auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['auth_callback'] ); 1281 } else { 1282 remove_filter( "auth_{$object_type}_meta_{$meta_key}", $args['auth_callback'] ); 1283 } 1284 } 1285 1286 unset( $wp_meta_keys[ $object_type ][ $object_subtype ][ $meta_key ] ); 1287 1288 // Do some clean up 1289 if ( empty( $wp_meta_keys[ $object_type ][ $object_subtype ] ) ) { 1290 unset( $wp_meta_keys[ $object_type ][ $object_subtype ] ); 1291 } 1292 if ( empty( $wp_meta_keys[ $object_type ] ) ) { 1293 unset( $wp_meta_keys[ $object_type ] ); 1294 } 1295 1296 return true; 1297 } 1298 1299 /** 1300 * Retrieves a list of registered meta keys for an object type. 1301 * 1302 * @since 4.6.0 1303 * @since 4.9.8 The `$object_subtype` parameter was added. 1304 * 1305 * @param string $object_type The type of object. Post, comment, user, term. 1306 * @param string $object_subtype Optional. The subtype of the object type. 1307 * @return array List of registered meta keys. 1308 */ 1309 function get_registered_meta_keys( $object_type, $object_subtype = '' ) { 1310 global $wp_meta_keys; 1311 1312 if ( ! is_array( $wp_meta_keys ) || ! isset( $wp_meta_keys[ $object_type ] ) || ! isset( $wp_meta_keys[ $object_type ][ $object_subtype ] ) ) { 1313 return array(); 1314 } 1315 1316 return $wp_meta_keys[ $object_type ][ $object_subtype ]; 1317 } 1318 1319 /** 1320 * Retrieves registered metadata for a specified object. 1321 * 1322 * The results include both meta that is registered specifically for the 1323 * object's subtype and meta that is registered for the entire object type. 1324 * 1325 * @since 4.6.0 1326 * 1327 * @param string $object_type Type of object to request metadata for. (e.g. comment, post, term, user) 1328 * @param int $object_id ID of the object the metadata is for. 1329 * @param string $meta_key Optional. Registered metadata key. If not specified, retrieve all registered 1330 * metadata for the specified object. 1331 * @return mixed A single value or array of values for a key if specified. An array of all registered keys 1332 * and values for an object ID if not. False if a given $meta_key is not registered. 1333 */ 1334 function get_registered_metadata( $object_type, $object_id, $meta_key = '' ) { 1335 $object_subtype = get_object_subtype( $object_type, $object_id ); 1336 1337 if ( ! empty( $meta_key ) ) { 1338 if ( ! empty( $object_subtype ) && ! registered_meta_key_exists( $object_type, $meta_key, $object_subtype ) ) { 1339 $object_subtype = ''; 1340 } 1341 1342 if ( ! registered_meta_key_exists( $object_type, $meta_key, $object_subtype ) ) { 1343 return false; 1344 } 1345 1346 $meta_keys = get_registered_meta_keys( $object_type, $object_subtype ); 1347 $meta_key_data = $meta_keys[ $meta_key ]; 1348 1349 $data = get_metadata( $object_type, $object_id, $meta_key, $meta_key_data['single'] ); 1350 1351 return $data; 1352 } 1353 1354 $data = get_metadata( $object_type, $object_id ); 1355 if ( ! $data ) { 1356 return array(); 1357 } 1358 1359 $meta_keys = get_registered_meta_keys( $object_type ); 1360 if ( ! empty( $object_subtype ) ) { 1361 $meta_keys = array_merge( $meta_keys, get_registered_meta_keys( $object_type, $object_subtype ) ); 1362 } 1363 1364 return array_intersect_key( $data, $meta_keys ); 1365 } 1366 1367 /** 1368 * Filter out `register_meta()` args based on a whitelist. 1369 * `register_meta()` args may change over time, so requiring the whitelist 1370 * to be explicitly turned off is a warranty seal of sorts. 1371 * 1372 * @access private 1373 * @since 4.6.0 1374 * 1375 * @param array $args Arguments from `register_meta()`. 1376 * @param array $default_args Default arguments for `register_meta()`. 1377 * 1378 * @return array Filtered arguments. 1379 */ 1380 function _wp_register_meta_args_whitelist( $args, $default_args ) { 1381 return array_intersect_key( $args, $default_args ); 1382 } 1383 1384 /** 1385 * Returns the object subtype for a given object ID of a specific type. 1386 * 1387 * @since 4.9.8 1388 * 1389 * @param string $object_type Type of object to request metadata for. (e.g. comment, post, term, user) 1390 * @param int $object_id ID of the object to retrieve its subtype. 1391 * @return string The object subtype or an empty string if unspecified subtype. 1392 */ 1393 function get_object_subtype( $object_type, $object_id ) { 1394 $object_id = (int) $object_id; 1395 $object_subtype = ''; 1396 1397 switch ( $object_type ) { 1398 case 'post': 1399 $post_type = get_post_type( $object_id ); 1400 1401 if ( ! empty( $post_type ) ) { 1402 $object_subtype = $post_type; 1403 } 1404 break; 1405 1406 case 'term': 1407 $term = get_term( $object_id ); 1408 if ( ! $term instanceof WP_Term ) { 1409 break; 1410 } 1411 1412 $object_subtype = $term->taxonomy; 1413 break; 1414 1415 case 'comment': 1416 $comment = get_comment( $object_id ); 1417 if ( ! $comment ) { 1418 break; 1419 } 1420 1421 $object_subtype = 'comment'; 1422 break; 1423 1424 case 'user': 1425 $user = get_user_by( 'id', $object_id ); 1426 if ( ! $user ) { 1427 break; 1428 } 1429 1430 $object_subtype = 'user'; 1431 break; 1432 } 1433 1434 /** 1435 * Filters the object subtype identifier for a non standard object type. 1436 * 1437 * The dynamic portion of the hook, `$object_type`, refers to the object 1438 * type (post, comment, term, or user). 1439 * 1440 * @since 4.9.8 1441 * 1442 * @param string $object_subtype Empty string to override. 1443 * @param int $object_id ID of the object to get the subtype for. 1444 */ 1445 return apply_filters( "get_object_subtype_{$object_type}", $object_subtype, $object_id ); 1446 }
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