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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 * Adds 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. Accepts 'post', 'comment', 'term', 'user', 21 * or any other object type with an associated meta table. 22 * @param int $object_id ID of the object metadata is for. 23 * @param string $meta_key Metadata key. 24 * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. 25 * @param bool $unique Optional. 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. Default false. 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, $meta_subtype ); 55 56 /** 57 * Short-circuits adding metadata of a specific type. 58 * 59 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 60 * (post, comment, term, user, or any other type with an associated meta table). 61 * Returning a non-null value will effectively short-circuit the function. 62 * 63 * Possible hook names include: 64 * 65 * - `add_post_metadata` 66 * - `add_comment_metadata` 67 * - `add_term_metadata` 68 * - `add_user_metadata` 69 * 70 * @since 3.1.0 71 * 72 * @param null|bool $check Whether to allow adding metadata for the given type. 73 * @param int $object_id ID of the object metadata is for. 74 * @param string $meta_key Metadata key. 75 * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. 76 * @param bool $unique Whether the specified meta key should be unique for the object. 77 */ 78 $check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique ); 79 if ( null !== $check ) { 80 return $check; 81 } 82 83 if ( $unique && $wpdb->get_var( 84 $wpdb->prepare( 85 "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d", 86 $meta_key, 87 $object_id 88 ) 89 ) ) { 90 return false; 91 } 92 93 $_meta_value = $meta_value; 94 $meta_value = maybe_serialize( $meta_value ); 95 96 /** 97 * Fires immediately before meta of a specific type is added. 98 * 99 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 100 * (post, comment, term, user, or any other type with an associated meta table). 101 * 102 * Possible hook names include: 103 * 104 * - `add_post_meta` 105 * - `add_comment_meta` 106 * - `add_term_meta` 107 * - `add_user_meta` 108 * 109 * @since 3.1.0 110 * 111 * @param int $object_id ID of the object metadata is for. 112 * @param string $meta_key Metadata key. 113 * @param mixed $_meta_value Metadata value. 114 */ 115 do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value ); 116 117 $result = $wpdb->insert( 118 $table, 119 array( 120 $column => $object_id, 121 'meta_key' => $meta_key, 122 'meta_value' => $meta_value, 123 ) 124 ); 125 126 if ( ! $result ) { 127 return false; 128 } 129 130 $mid = (int) $wpdb->insert_id; 131 132 wp_cache_delete( $object_id, $meta_type . '_meta' ); 133 134 /** 135 * Fires immediately after meta of a specific type is added. 136 * 137 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 138 * (post, comment, term, user, or any other type with an associated meta table). 139 * 140 * Possible hook names include: 141 * 142 * - `added_post_meta` 143 * - `added_comment_meta` 144 * - `added_term_meta` 145 * - `added_user_meta` 146 * 147 * @since 2.9.0 148 * 149 * @param int $mid The meta ID after successful update. 150 * @param int $object_id ID of the object metadata is for. 151 * @param string $meta_key Metadata key. 152 * @param mixed $_meta_value Metadata value. 153 */ 154 do_action( "added_{$meta_type}_meta", $mid, $object_id, $meta_key, $_meta_value ); 155 156 return $mid; 157 } 158 159 /** 160 * Updates metadata for the specified object. If no value already exists for the specified object 161 * ID and metadata key, the metadata will be added. 162 * 163 * @since 2.9.0 164 * 165 * @global wpdb $wpdb WordPress database abstraction object. 166 * 167 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 168 * or any other object type with an associated meta table. 169 * @param int $object_id ID of the object metadata is for. 170 * @param string $meta_key Metadata key. 171 * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. 172 * @param mixed $prev_value Optional. Previous value to check before updating. 173 * If specified, only update existing metadata entries with 174 * this value. Otherwise, update all entries. Default empty. 175 * @return int|bool The new meta field ID if a field with the given key didn't exist 176 * and was therefore added, true on successful update, 177 * false on failure or if the value passed to the function 178 * is the same as the one that is already in the database. 179 */ 180 function update_metadata( $meta_type, $object_id, $meta_key, $meta_value, $prev_value = '' ) { 181 global $wpdb; 182 183 if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) ) { 184 return false; 185 } 186 187 $object_id = absint( $object_id ); 188 if ( ! $object_id ) { 189 return false; 190 } 191 192 $table = _get_meta_table( $meta_type ); 193 if ( ! $table ) { 194 return false; 195 } 196 197 $meta_subtype = get_object_subtype( $meta_type, $object_id ); 198 199 $column = sanitize_key( $meta_type . '_id' ); 200 $id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id'; 201 202 // expected_slashed ($meta_key) 203 $raw_meta_key = $meta_key; 204 $meta_key = wp_unslash( $meta_key ); 205 $passed_value = $meta_value; 206 $meta_value = wp_unslash( $meta_value ); 207 $meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type, $meta_subtype ); 208 209 /** 210 * Short-circuits updating metadata of a specific type. 211 * 212 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 213 * (post, comment, term, user, or any other type with an associated meta table). 214 * Returning a non-null value will effectively short-circuit the function. 215 * 216 * Possible hook names include: 217 * 218 * - `update_post_metadata` 219 * - `update_comment_metadata` 220 * - `update_term_metadata` 221 * - `update_user_metadata` 222 * 223 * @since 3.1.0 224 * 225 * @param null|bool $check Whether to allow updating metadata for the given type. 226 * @param int $object_id ID of the object metadata is for. 227 * @param string $meta_key Metadata key. 228 * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. 229 * @param mixed $prev_value Optional. Previous value to check before updating. 230 * If specified, only update existing metadata entries with 231 * this value. Otherwise, update all entries. 232 */ 233 $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value ); 234 if ( null !== $check ) { 235 return (bool) $check; 236 } 237 238 // Compare existing value to new value if no prev value given and the key exists only once. 239 if ( empty( $prev_value ) ) { 240 $old_value = get_metadata_raw( $meta_type, $object_id, $meta_key ); 241 if ( is_countable( $old_value ) && count( $old_value ) === 1 ) { 242 if ( $old_value[0] === $meta_value ) { 243 return false; 244 } 245 } 246 } 247 248 $meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) ); 249 if ( empty( $meta_ids ) ) { 250 return add_metadata( $meta_type, $object_id, $raw_meta_key, $passed_value ); 251 } 252 253 $_meta_value = $meta_value; 254 $meta_value = maybe_serialize( $meta_value ); 255 256 $data = compact( 'meta_value' ); 257 $where = array( 258 $column => $object_id, 259 'meta_key' => $meta_key, 260 ); 261 262 if ( ! empty( $prev_value ) ) { 263 $prev_value = maybe_serialize( $prev_value ); 264 $where['meta_value'] = $prev_value; 265 } 266 267 foreach ( $meta_ids as $meta_id ) { 268 /** 269 * Fires immediately before updating metadata of a specific type. 270 * 271 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 272 * (post, comment, term, user, or any other type with an associated meta table). 273 * 274 * Possible hook names include: 275 * 276 * - `update_post_meta` 277 * - `update_comment_meta` 278 * - `update_term_meta` 279 * - `update_user_meta` 280 * 281 * @since 2.9.0 282 * 283 * @param int $meta_id ID of the metadata entry to update. 284 * @param int $object_id ID of the object metadata is for. 285 * @param string $meta_key Metadata key. 286 * @param mixed $_meta_value Metadata value. 287 */ 288 do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); 289 290 if ( 'post' === $meta_type ) { 291 /** 292 * Fires immediately before updating a post's metadata. 293 * 294 * @since 2.9.0 295 * 296 * @param int $meta_id ID of metadata entry to update. 297 * @param int $object_id Post ID. 298 * @param string $meta_key Metadata key. 299 * @param mixed $meta_value Metadata value. This will be a PHP-serialized string representation of the value 300 * if the value is an array, an object, or itself a PHP-serialized string. 301 */ 302 do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); 303 } 304 } 305 306 $result = $wpdb->update( $table, $data, $where ); 307 if ( ! $result ) { 308 return false; 309 } 310 311 wp_cache_delete( $object_id, $meta_type . '_meta' ); 312 313 foreach ( $meta_ids as $meta_id ) { 314 /** 315 * Fires immediately after updating metadata of a specific type. 316 * 317 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 318 * (post, comment, term, user, or any other type with an associated meta table). 319 * 320 * Possible hook names include: 321 * 322 * - `updated_post_meta` 323 * - `updated_comment_meta` 324 * - `updated_term_meta` 325 * - `updated_user_meta` 326 * 327 * @since 2.9.0 328 * 329 * @param int $meta_id ID of updated metadata entry. 330 * @param int $object_id ID of the object metadata is for. 331 * @param string $meta_key Metadata key. 332 * @param mixed $_meta_value Metadata value. 333 */ 334 do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); 335 336 if ( 'post' === $meta_type ) { 337 /** 338 * Fires immediately after updating a post's metadata. 339 * 340 * @since 2.9.0 341 * 342 * @param int $meta_id ID of updated metadata entry. 343 * @param int $object_id Post ID. 344 * @param string $meta_key Metadata key. 345 * @param mixed $meta_value Metadata value. This will be a PHP-serialized string representation of the value 346 * if the value is an array, an object, or itself a PHP-serialized string. 347 */ 348 do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); 349 } 350 } 351 352 return true; 353 } 354 355 /** 356 * Deletes metadata for the specified object. 357 * 358 * @since 2.9.0 359 * 360 * @global wpdb $wpdb WordPress database abstraction object. 361 * 362 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 363 * or any other object type with an associated meta table. 364 * @param int $object_id ID of the object metadata is for. 365 * @param string $meta_key Metadata key. 366 * @param mixed $meta_value Optional. Metadata value. Must be serializable if non-scalar. 367 * If specified, only delete metadata entries with this value. 368 * Otherwise, delete all entries with the specified meta_key. 369 * Pass `null`, `false`, or an empty string to skip this check. 370 * (For backward compatibility, it is not possible to pass an empty string 371 * to delete those entries with an empty string for a value.) 372 * @param bool $delete_all Optional. If true, delete matching metadata entries for all objects, 373 * ignoring the specified object_id. Otherwise, only delete 374 * matching metadata entries for the specified object_id. Default false. 375 * @return bool True on successful delete, false on failure. 376 */ 377 function delete_metadata( $meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false ) { 378 global $wpdb; 379 380 if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) && ! $delete_all ) { 381 return false; 382 } 383 384 $object_id = absint( $object_id ); 385 if ( ! $object_id && ! $delete_all ) { 386 return false; 387 } 388 389 $table = _get_meta_table( $meta_type ); 390 if ( ! $table ) { 391 return false; 392 } 393 394 $type_column = sanitize_key( $meta_type . '_id' ); 395 $id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id'; 396 397 // expected_slashed ($meta_key) 398 $meta_key = wp_unslash( $meta_key ); 399 $meta_value = wp_unslash( $meta_value ); 400 401 /** 402 * Short-circuits deleting metadata of a specific type. 403 * 404 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 405 * (post, comment, term, user, or any other type with an associated meta table). 406 * Returning a non-null value will effectively short-circuit the function. 407 * 408 * Possible hook names include: 409 * 410 * - `delete_post_metadata` 411 * - `delete_comment_metadata` 412 * - `delete_term_metadata` 413 * - `delete_user_metadata` 414 * 415 * @since 3.1.0 416 * 417 * @param null|bool $delete Whether to allow metadata deletion of the given type. 418 * @param int $object_id ID of the object metadata is for. 419 * @param string $meta_key Metadata key. 420 * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. 421 * @param bool $delete_all Whether to delete the matching metadata entries 422 * for all objects, ignoring the specified $object_id. 423 * Default false. 424 */ 425 $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all ); 426 if ( null !== $check ) { 427 return (bool) $check; 428 } 429 430 $_meta_value = $meta_value; 431 $meta_value = maybe_serialize( $meta_value ); 432 433 $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key ); 434 435 if ( ! $delete_all ) { 436 $query .= $wpdb->prepare( " AND $type_column = %d", $object_id ); 437 } 438 439 if ( '' !== $meta_value && null !== $meta_value && false !== $meta_value ) { 440 $query .= $wpdb->prepare( ' AND meta_value = %s', $meta_value ); 441 } 442 443 $meta_ids = $wpdb->get_col( $query ); 444 if ( ! count( $meta_ids ) ) { 445 return false; 446 } 447 448 if ( $delete_all ) { 449 if ( '' !== $meta_value && null !== $meta_value && false !== $meta_value ) { 450 $object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s AND meta_value = %s", $meta_key, $meta_value ) ); 451 } else { 452 $object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) ); 453 } 454 } 455 456 /** 457 * Fires immediately before deleting metadata of a specific type. 458 * 459 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 460 * (post, comment, term, user, or any other type with an associated meta table). 461 * 462 * Possible hook names include: 463 * 464 * - `delete_post_meta` 465 * - `delete_comment_meta` 466 * - `delete_term_meta` 467 * - `delete_user_meta` 468 * 469 * @since 3.1.0 470 * 471 * @param string[] $meta_ids An array of metadata entry IDs to delete. 472 * @param int $object_id ID of the object metadata is for. 473 * @param string $meta_key Metadata key. 474 * @param mixed $_meta_value Metadata value. 475 */ 476 do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); 477 478 // Old-style action. 479 if ( 'post' === $meta_type ) { 480 /** 481 * Fires immediately before deleting metadata for a post. 482 * 483 * @since 2.9.0 484 * 485 * @param string[] $meta_ids An array of metadata entry IDs to delete. 486 */ 487 do_action( 'delete_postmeta', $meta_ids ); 488 } 489 490 $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . ' )'; 491 492 $count = $wpdb->query( $query ); 493 494 if ( ! $count ) { 495 return false; 496 } 497 498 if ( $delete_all ) { 499 $data = (array) $object_ids; 500 } else { 501 $data = array( $object_id ); 502 } 503 wp_cache_delete_multiple( $data, $meta_type . '_meta' ); 504 505 /** 506 * Fires immediately after deleting metadata of a specific type. 507 * 508 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 509 * (post, comment, term, user, or any other type with an associated meta table). 510 * 511 * Possible hook names include: 512 * 513 * - `deleted_post_meta` 514 * - `deleted_comment_meta` 515 * - `deleted_term_meta` 516 * - `deleted_user_meta` 517 * 518 * @since 2.9.0 519 * 520 * @param string[] $meta_ids An array of metadata entry IDs to delete. 521 * @param int $object_id ID of the object metadata is for. 522 * @param string $meta_key Metadata key. 523 * @param mixed $_meta_value Metadata value. 524 */ 525 do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); 526 527 // Old-style action. 528 if ( 'post' === $meta_type ) { 529 /** 530 * Fires immediately after deleting metadata for a post. 531 * 532 * @since 2.9.0 533 * 534 * @param string[] $meta_ids An array of metadata entry IDs to delete. 535 */ 536 do_action( 'deleted_postmeta', $meta_ids ); 537 } 538 539 return true; 540 } 541 542 /** 543 * Retrieves the value of a metadata field for the specified object type and ID. 544 * 545 * If the meta field exists, a single value is returned if `$single` is true, 546 * or an array of values if it's false. 547 * 548 * If the meta field does not exist, the result depends on get_metadata_default(). 549 * By default, an empty string is returned if `$single` is true, or an empty array 550 * if it's false. 551 * 552 * @since 2.9.0 553 * 554 * @see get_metadata_raw() 555 * @see get_metadata_default() 556 * 557 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 558 * or any other object type with an associated meta table. 559 * @param int $object_id ID of the object metadata is for. 560 * @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for 561 * the specified object. Default empty. 562 * @param bool $single Optional. If true, return only the first value of the specified `$meta_key`. 563 * This parameter has no effect if `$meta_key` is not specified. Default false. 564 * @return mixed An array of values if `$single` is false. 565 * The value of the meta field if `$single` is true. 566 * False for an invalid `$object_id` (non-numeric, zero, or negative value), 567 * or if `$meta_type` is not specified. 568 * An empty string if a valid but non-existing object ID is passed. 569 */ 570 function get_metadata( $meta_type, $object_id, $meta_key = '', $single = false ) { 571 $value = get_metadata_raw( $meta_type, $object_id, $meta_key, $single ); 572 if ( ! is_null( $value ) ) { 573 return $value; 574 } 575 576 return get_metadata_default( $meta_type, $object_id, $meta_key, $single ); 577 } 578 579 /** 580 * Retrieves raw metadata value for the specified object. 581 * 582 * @since 5.5.0 583 * 584 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 585 * or any other object type with an associated meta table. 586 * @param int $object_id ID of the object metadata is for. 587 * @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for 588 * the specified object. Default empty. 589 * @param bool $single Optional. If true, return only the first value of the specified `$meta_key`. 590 * This parameter has no effect if `$meta_key` is not specified. Default false. 591 * @return mixed An array of values if `$single` is false. 592 * The value of the meta field if `$single` is true. 593 * False for an invalid `$object_id` (non-numeric, zero, or negative value), 594 * or if `$meta_type` is not specified. 595 * Null if the value does not exist. 596 */ 597 function get_metadata_raw( $meta_type, $object_id, $meta_key = '', $single = false ) { 598 if ( ! $meta_type || ! is_numeric( $object_id ) ) { 599 return false; 600 } 601 602 $object_id = absint( $object_id ); 603 if ( ! $object_id ) { 604 return false; 605 } 606 607 /** 608 * Short-circuits the return value of a meta field. 609 * 610 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 611 * (post, comment, term, user, or any other type with an associated meta table). 612 * Returning a non-null value will effectively short-circuit the function. 613 * 614 * Possible filter names include: 615 * 616 * - `get_post_metadata` 617 * - `get_comment_metadata` 618 * - `get_term_metadata` 619 * - `get_user_metadata` 620 * 621 * @since 3.1.0 622 * @since 5.5.0 Added the `$meta_type` parameter. 623 * 624 * @param mixed $value The value to return, either a single metadata value or an array 625 * of values depending on the value of `$single`. Default null. 626 * @param int $object_id ID of the object metadata is for. 627 * @param string $meta_key Metadata key. 628 * @param bool $single Whether to return only the first value of the specified `$meta_key`. 629 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 630 * or any other object type with an associated meta table. 631 */ 632 $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single, $meta_type ); 633 if ( null !== $check ) { 634 if ( $single && is_array( $check ) ) { 635 return $check[0]; 636 } else { 637 return $check; 638 } 639 } 640 641 $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); 642 643 if ( ! $meta_cache ) { 644 $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); 645 if ( isset( $meta_cache[ $object_id ] ) ) { 646 $meta_cache = $meta_cache[ $object_id ]; 647 } else { 648 $meta_cache = null; 649 } 650 } 651 652 if ( ! $meta_key ) { 653 return $meta_cache; 654 } 655 656 if ( isset( $meta_cache[ $meta_key ] ) ) { 657 if ( $single ) { 658 return maybe_unserialize( $meta_cache[ $meta_key ][0] ); 659 } else { 660 return array_map( 'maybe_unserialize', $meta_cache[ $meta_key ] ); 661 } 662 } 663 664 return null; 665 } 666 667 /** 668 * Retrieves default metadata value for the specified meta key and object. 669 * 670 * By default, an empty string is returned if `$single` is true, or an empty array 671 * if it's false. 672 * 673 * @since 5.5.0 674 * 675 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 676 * or any other object type with an associated meta table. 677 * @param int $object_id ID of the object metadata is for. 678 * @param string $meta_key Metadata key. 679 * @param bool $single Optional. If true, return only the first value of the specified `$meta_key`. 680 * This parameter has no effect if `$meta_key` is not specified. Default false. 681 * @return mixed An array of default values if `$single` is false. 682 * The default value of the meta field if `$single` is true. 683 */ 684 function get_metadata_default( $meta_type, $object_id, $meta_key, $single = false ) { 685 if ( $single ) { 686 $value = ''; 687 } else { 688 $value = array(); 689 } 690 691 /** 692 * Filters the default metadata value for a specified meta key and object. 693 * 694 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 695 * (post, comment, term, user, or any other type with an associated meta table). 696 * 697 * Possible filter names include: 698 * 699 * - `default_post_metadata` 700 * - `default_comment_metadata` 701 * - `default_term_metadata` 702 * - `default_user_metadata` 703 * 704 * @since 5.5.0 705 * 706 * @param mixed $value The value to return, either a single metadata value or an array 707 * of values depending on the value of `$single`. 708 * @param int $object_id ID of the object metadata is for. 709 * @param string $meta_key Metadata key. 710 * @param bool $single Whether to return only the first value of the specified `$meta_key`. 711 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 712 * or any other object type with an associated meta table. 713 */ 714 $value = apply_filters( "default_{$meta_type}_metadata", $value, $object_id, $meta_key, $single, $meta_type ); 715 716 if ( ! $single && ! wp_is_numeric_array( $value ) ) { 717 $value = array( $value ); 718 } 719 720 return $value; 721 } 722 723 /** 724 * Determines if a meta field with the given key exists for the given object ID. 725 * 726 * @since 3.3.0 727 * 728 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 729 * or any other object type with an associated meta table. 730 * @param int $object_id ID of the object metadata is for. 731 * @param string $meta_key Metadata key. 732 * @return bool Whether a meta field with the given key exists. 733 */ 734 function metadata_exists( $meta_type, $object_id, $meta_key ) { 735 if ( ! $meta_type || ! is_numeric( $object_id ) ) { 736 return false; 737 } 738 739 $object_id = absint( $object_id ); 740 if ( ! $object_id ) { 741 return false; 742 } 743 744 /** This filter is documented in wp-includes/meta.php */ 745 $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true, $meta_type ); 746 if ( null !== $check ) { 747 return (bool) $check; 748 } 749 750 $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); 751 752 if ( ! $meta_cache ) { 753 $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); 754 $meta_cache = $meta_cache[ $object_id ]; 755 } 756 757 if ( isset( $meta_cache[ $meta_key ] ) ) { 758 return true; 759 } 760 761 return false; 762 } 763 764 /** 765 * Retrieves metadata by meta ID. 766 * 767 * @since 3.3.0 768 * 769 * @global wpdb $wpdb WordPress database abstraction object. 770 * 771 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 772 * or any other object type with an associated meta table. 773 * @param int $meta_id ID for a specific meta row. 774 * @return stdClass|false { 775 * Metadata object, or boolean `false` if the metadata doesn't exist. 776 * 777 * @type string $meta_key The meta key. 778 * @type mixed $meta_value The unserialized meta value. 779 * @type string $meta_id Optional. The meta ID when the meta type is any value except 'user'. 780 * @type string $umeta_id Optional. The meta ID when the meta type is 'user'. 781 * @type string $post_id Optional. The object ID when the meta type is 'post'. 782 * @type string $comment_id Optional. The object ID when the meta type is 'comment'. 783 * @type string $term_id Optional. The object ID when the meta type is 'term'. 784 * @type string $user_id Optional. The object ID when the meta type is 'user'. 785 * } 786 */ 787 function get_metadata_by_mid( $meta_type, $meta_id ) { 788 global $wpdb; 789 790 if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) { 791 return false; 792 } 793 794 $meta_id = (int) $meta_id; 795 if ( $meta_id <= 0 ) { 796 return false; 797 } 798 799 $table = _get_meta_table( $meta_type ); 800 if ( ! $table ) { 801 return false; 802 } 803 804 /** 805 * Short-circuits the return value when fetching a meta field by meta ID. 806 * 807 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 808 * (post, comment, term, user, or any other type with an associated meta table). 809 * Returning a non-null value will effectively short-circuit the function. 810 * 811 * Possible hook names include: 812 * 813 * - `get_post_metadata_by_mid` 814 * - `get_comment_metadata_by_mid` 815 * - `get_term_metadata_by_mid` 816 * - `get_user_metadata_by_mid` 817 * 818 * @since 5.0.0 819 * 820 * @param stdClass|null $value The value to return. 821 * @param int $meta_id Meta ID. 822 */ 823 $check = apply_filters( "get_{$meta_type}_metadata_by_mid", null, $meta_id ); 824 if ( null !== $check ) { 825 return $check; 826 } 827 828 $id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id'; 829 830 $meta = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table WHERE $id_column = %d", $meta_id ) ); 831 832 if ( empty( $meta ) ) { 833 return false; 834 } 835 836 if ( isset( $meta->meta_value ) ) { 837 $meta->meta_value = maybe_unserialize( $meta->meta_value ); 838 } 839 840 return $meta; 841 } 842 843 /** 844 * Updates metadata by meta ID. 845 * 846 * @since 3.3.0 847 * 848 * @global wpdb $wpdb WordPress database abstraction object. 849 * 850 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 851 * or any other object type with an associated meta table. 852 * @param int $meta_id ID for a specific meta row. 853 * @param string $meta_value Metadata value. Must be serializable if non-scalar. 854 * @param string|false $meta_key Optional. You can provide a meta key to update it. Default false. 855 * @return bool True on successful update, false on failure. 856 */ 857 function update_metadata_by_mid( $meta_type, $meta_id, $meta_value, $meta_key = false ) { 858 global $wpdb; 859 860 // Make sure everything is valid. 861 if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) { 862 return false; 863 } 864 865 $meta_id = (int) $meta_id; 866 if ( $meta_id <= 0 ) { 867 return false; 868 } 869 870 $table = _get_meta_table( $meta_type ); 871 if ( ! $table ) { 872 return false; 873 } 874 875 $column = sanitize_key( $meta_type . '_id' ); 876 $id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id'; 877 878 /** 879 * Short-circuits updating metadata of a specific type by meta ID. 880 * 881 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 882 * (post, comment, term, user, or any other type with an associated meta table). 883 * Returning a non-null value will effectively short-circuit the function. 884 * 885 * Possible hook names include: 886 * 887 * - `update_post_metadata_by_mid` 888 * - `update_comment_metadata_by_mid` 889 * - `update_term_metadata_by_mid` 890 * - `update_user_metadata_by_mid` 891 * 892 * @since 5.0.0 893 * 894 * @param null|bool $check Whether to allow updating metadata for the given type. 895 * @param int $meta_id Meta ID. 896 * @param mixed $meta_value Meta value. Must be serializable if non-scalar. 897 * @param string|false $meta_key Meta key, if provided. 898 */ 899 $check = apply_filters( "update_{$meta_type}_metadata_by_mid", null, $meta_id, $meta_value, $meta_key ); 900 if ( null !== $check ) { 901 return (bool) $check; 902 } 903 904 // Fetch the meta and go on if it's found. 905 $meta = get_metadata_by_mid( $meta_type, $meta_id ); 906 if ( $meta ) { 907 $original_key = $meta->meta_key; 908 $object_id = $meta->{$column}; 909 910 // If a new meta_key (last parameter) was specified, change the meta key, 911 // otherwise use the original key in the update statement. 912 if ( false === $meta_key ) { 913 $meta_key = $original_key; 914 } elseif ( ! is_string( $meta_key ) ) { 915 return false; 916 } 917 918 $meta_subtype = get_object_subtype( $meta_type, $object_id ); 919 920 // Sanitize the meta. 921 $_meta_value = $meta_value; 922 $meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type, $meta_subtype ); 923 $meta_value = maybe_serialize( $meta_value ); 924 925 // Format the data query arguments. 926 $data = array( 927 'meta_key' => $meta_key, 928 'meta_value' => $meta_value, 929 ); 930 931 // Format the where query arguments. 932 $where = array(); 933 $where[ $id_column ] = $meta_id; 934 935 /** This action is documented in wp-includes/meta.php */ 936 do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); 937 938 if ( 'post' === $meta_type ) { 939 /** This action is documented in wp-includes/meta.php */ 940 do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); 941 } 942 943 // Run the update query, all fields in $data are %s, $where is a %d. 944 $result = $wpdb->update( $table, $data, $where, '%s', '%d' ); 945 if ( ! $result ) { 946 return false; 947 } 948 949 // Clear the caches. 950 wp_cache_delete( $object_id, $meta_type . '_meta' ); 951 952 /** This action is documented in wp-includes/meta.php */ 953 do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value ); 954 955 if ( 'post' === $meta_type ) { 956 /** This action is documented in wp-includes/meta.php */ 957 do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value ); 958 } 959 960 return true; 961 } 962 963 // And if the meta was not found. 964 return false; 965 } 966 967 /** 968 * Deletes metadata by meta ID. 969 * 970 * @since 3.3.0 971 * 972 * @global wpdb $wpdb WordPress database abstraction object. 973 * 974 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 975 * or any other object type with an associated meta table. 976 * @param int $meta_id ID for a specific meta row. 977 * @return bool True on successful delete, false on failure. 978 */ 979 function delete_metadata_by_mid( $meta_type, $meta_id ) { 980 global $wpdb; 981 982 // Make sure everything is valid. 983 if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) { 984 return false; 985 } 986 987 $meta_id = (int) $meta_id; 988 if ( $meta_id <= 0 ) { 989 return false; 990 } 991 992 $table = _get_meta_table( $meta_type ); 993 if ( ! $table ) { 994 return false; 995 } 996 997 // Object and ID columns. 998 $column = sanitize_key( $meta_type . '_id' ); 999 $id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id'; 1000 1001 /** 1002 * Short-circuits deleting metadata of a specific type by meta ID. 1003 * 1004 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 1005 * (post, comment, term, user, or any other type with an associated meta table). 1006 * Returning a non-null value will effectively short-circuit the function. 1007 * 1008 * Possible hook names include: 1009 * 1010 * - `delete_post_metadata_by_mid` 1011 * - `delete_comment_metadata_by_mid` 1012 * - `delete_term_metadata_by_mid` 1013 * - `delete_user_metadata_by_mid` 1014 * 1015 * @since 5.0.0 1016 * 1017 * @param null|bool $delete Whether to allow metadata deletion of the given type. 1018 * @param int $meta_id Meta ID. 1019 */ 1020 $check = apply_filters( "delete_{$meta_type}_metadata_by_mid", null, $meta_id ); 1021 if ( null !== $check ) { 1022 return (bool) $check; 1023 } 1024 1025 // Fetch the meta and go on if it's found. 1026 $meta = get_metadata_by_mid( $meta_type, $meta_id ); 1027 if ( $meta ) { 1028 $object_id = (int) $meta->{$column}; 1029 1030 /** This action is documented in wp-includes/meta.php */ 1031 do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); 1032 1033 // Old-style action. 1034 if ( 'post' === $meta_type || 'comment' === $meta_type ) { 1035 /** 1036 * Fires immediately before deleting post or comment metadata of a specific type. 1037 * 1038 * The dynamic portion of the hook name, `$meta_type`, refers to the meta 1039 * object type (post or comment). 1040 * 1041 * Possible hook names include: 1042 * 1043 * - `delete_postmeta` 1044 * - `delete_commentmeta` 1045 * - `delete_termmeta` 1046 * - `delete_usermeta` 1047 * 1048 * @since 3.4.0 1049 * 1050 * @param int $meta_id ID of the metadata entry to delete. 1051 */ 1052 do_action( "delete_{$meta_type}meta", $meta_id ); 1053 } 1054 1055 // Run the query, will return true if deleted, false otherwise. 1056 $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); 1057 1058 // Clear the caches. 1059 wp_cache_delete( $object_id, $meta_type . '_meta' ); 1060 1061 /** This action is documented in wp-includes/meta.php */ 1062 do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); 1063 1064 // Old-style action. 1065 if ( 'post' === $meta_type || 'comment' === $meta_type ) { 1066 /** 1067 * Fires immediately after deleting post or comment metadata of a specific type. 1068 * 1069 * The dynamic portion of the hook name, `$meta_type`, refers to the meta 1070 * object type (post or comment). 1071 * 1072 * Possible hook names include: 1073 * 1074 * - `deleted_postmeta` 1075 * - `deleted_commentmeta` 1076 * - `deleted_termmeta` 1077 * - `deleted_usermeta` 1078 * 1079 * @since 3.4.0 1080 * 1081 * @param int $meta_ids Deleted metadata entry ID. 1082 */ 1083 do_action( "deleted_{$meta_type}meta", $meta_id ); 1084 } 1085 1086 return $result; 1087 1088 } 1089 1090 // Meta ID was not found. 1091 return false; 1092 } 1093 1094 /** 1095 * Updates the metadata cache for the specified objects. 1096 * 1097 * @since 2.9.0 1098 * 1099 * @global wpdb $wpdb WordPress database abstraction object. 1100 * 1101 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1102 * or any other object type with an associated meta table. 1103 * @param string|int[] $object_ids Array or comma delimited list of object IDs to update cache for. 1104 * @return array|false Metadata cache for the specified objects, or false on failure. 1105 */ 1106 function update_meta_cache( $meta_type, $object_ids ) { 1107 global $wpdb; 1108 1109 if ( ! $meta_type || ! $object_ids ) { 1110 return false; 1111 } 1112 1113 $table = _get_meta_table( $meta_type ); 1114 if ( ! $table ) { 1115 return false; 1116 } 1117 1118 $column = sanitize_key( $meta_type . '_id' ); 1119 1120 if ( ! is_array( $object_ids ) ) { 1121 $object_ids = preg_replace( '|[^0-9,]|', '', $object_ids ); 1122 $object_ids = explode( ',', $object_ids ); 1123 } 1124 1125 $object_ids = array_map( 'intval', $object_ids ); 1126 1127 /** 1128 * Short-circuits updating the metadata cache of a specific type. 1129 * 1130 * The dynamic portion of the hook name, `$meta_type`, refers to the meta object type 1131 * (post, comment, term, user, or any other type with an associated meta table). 1132 * Returning a non-null value will effectively short-circuit the function. 1133 * 1134 * Possible hook names include: 1135 * 1136 * - `update_post_metadata_cache` 1137 * - `update_comment_metadata_cache` 1138 * - `update_term_metadata_cache` 1139 * - `update_user_metadata_cache` 1140 * 1141 * @since 5.0.0 1142 * 1143 * @param mixed $check Whether to allow updating the meta cache of the given type. 1144 * @param int[] $object_ids Array of object IDs to update the meta cache for. 1145 */ 1146 $check = apply_filters( "update_{$meta_type}_metadata_cache", null, $object_ids ); 1147 if ( null !== $check ) { 1148 return (bool) $check; 1149 } 1150 1151 $cache_key = $meta_type . '_meta'; 1152 $non_cached_ids = array(); 1153 $cache = array(); 1154 $cache_values = wp_cache_get_multiple( $object_ids, $cache_key ); 1155 1156 foreach ( $cache_values as $id => $cached_object ) { 1157 if ( false === $cached_object ) { 1158 $non_cached_ids[] = $id; 1159 } else { 1160 $cache[ $id ] = $cached_object; 1161 } 1162 } 1163 1164 if ( empty( $non_cached_ids ) ) { 1165 return $cache; 1166 } 1167 1168 // Get meta info. 1169 $id_list = implode( ',', $non_cached_ids ); 1170 $id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id'; 1171 1172 $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 ); 1173 1174 if ( ! empty( $meta_list ) ) { 1175 foreach ( $meta_list as $metarow ) { 1176 $mpid = (int) $metarow[ $column ]; 1177 $mkey = $metarow['meta_key']; 1178 $mval = $metarow['meta_value']; 1179 1180 // Force subkeys to be array type. 1181 if ( ! isset( $cache[ $mpid ] ) || ! is_array( $cache[ $mpid ] ) ) { 1182 $cache[ $mpid ] = array(); 1183 } 1184 if ( ! isset( $cache[ $mpid ][ $mkey ] ) || ! is_array( $cache[ $mpid ][ $mkey ] ) ) { 1185 $cache[ $mpid ][ $mkey ] = array(); 1186 } 1187 1188 // Add a value to the current pid/key. 1189 $cache[ $mpid ][ $mkey ][] = $mval; 1190 } 1191 } 1192 1193 $data = array(); 1194 foreach ( $non_cached_ids as $id ) { 1195 if ( ! isset( $cache[ $id ] ) ) { 1196 $cache[ $id ] = array(); 1197 } 1198 $data[ $id ] = $cache[ $id ]; 1199 } 1200 wp_cache_add_multiple( $data, $cache_key ); 1201 1202 return $cache; 1203 } 1204 1205 /** 1206 * Retrieves the queue for lazy-loading metadata. 1207 * 1208 * @since 4.5.0 1209 * 1210 * @return WP_Metadata_Lazyloader Metadata lazyloader queue. 1211 */ 1212 function wp_metadata_lazyloader() { 1213 static $wp_metadata_lazyloader; 1214 1215 if ( null === $wp_metadata_lazyloader ) { 1216 $wp_metadata_lazyloader = new WP_Metadata_Lazyloader(); 1217 } 1218 1219 return $wp_metadata_lazyloader; 1220 } 1221 1222 /** 1223 * Given a meta query, generates SQL clauses to be appended to a main query. 1224 * 1225 * @since 3.2.0 1226 * 1227 * @see WP_Meta_Query 1228 * 1229 * @param array $meta_query A meta query. 1230 * @param string $type Type of meta. 1231 * @param string $primary_table Primary database table name. 1232 * @param string $primary_id_column Primary ID column name. 1233 * @param object $context Optional. The main query object 1234 * @return array Associative array of `JOIN` and `WHERE` SQL. 1235 */ 1236 function get_meta_sql( $meta_query, $type, $primary_table, $primary_id_column, $context = null ) { 1237 $meta_query_obj = new WP_Meta_Query( $meta_query ); 1238 return $meta_query_obj->get_sql( $type, $primary_table, $primary_id_column, $context ); 1239 } 1240 1241 /** 1242 * Retrieves the name of the metadata table for the specified object type. 1243 * 1244 * @since 2.9.0 1245 * 1246 * @global wpdb $wpdb WordPress database abstraction object. 1247 * 1248 * @param string $type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1249 * or any other object type with an associated meta table. 1250 * @return string|false Metadata table name, or false if no metadata table exists 1251 */ 1252 function _get_meta_table( $type ) { 1253 global $wpdb; 1254 1255 $table_name = $type . 'meta'; 1256 1257 if ( empty( $wpdb->$table_name ) ) { 1258 return false; 1259 } 1260 1261 return $wpdb->$table_name; 1262 } 1263 1264 /** 1265 * Determines whether a meta key is considered protected. 1266 * 1267 * @since 3.1.3 1268 * 1269 * @param string $meta_key Metadata key. 1270 * @param string $meta_type Optional. Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1271 * or any other object type with an associated meta table. Default empty. 1272 * @return bool Whether the meta key is considered protected. 1273 */ 1274 function is_protected_meta( $meta_key, $meta_type = '' ) { 1275 $sanitized_key = preg_replace( "/[^\x20-\x7E\p{L}]/", '', $meta_key ); 1276 $protected = strlen( $sanitized_key ) > 0 && ( '_' === $sanitized_key[0] ); 1277 1278 /** 1279 * Filters whether a meta key is considered protected. 1280 * 1281 * @since 3.2.0 1282 * 1283 * @param bool $protected Whether the key is considered protected. 1284 * @param string $meta_key Metadata key. 1285 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1286 * or any other object type with an associated meta table. 1287 */ 1288 return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); 1289 } 1290 1291 /** 1292 * Sanitizes meta value. 1293 * 1294 * @since 3.1.3 1295 * @since 4.9.8 The `$object_subtype` parameter was added. 1296 * 1297 * @param string $meta_key Metadata key. 1298 * @param mixed $meta_value Metadata value to sanitize. 1299 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1300 * or any other object type with an associated meta table. 1301 * @param string $object_subtype Optional. The subtype of the object type. 1302 * @return mixed Sanitized $meta_value. 1303 */ 1304 function sanitize_meta( $meta_key, $meta_value, $object_type, $object_subtype = '' ) { 1305 if ( ! empty( $object_subtype ) && has_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}" ) ) { 1306 1307 /** 1308 * Filters the sanitization of a specific meta key of a specific meta type and subtype. 1309 * 1310 * The dynamic portions of the hook name, `$object_type`, `$meta_key`, 1311 * and `$object_subtype`, refer to the metadata object type (comment, post, term, or user), 1312 * the meta key value, and the object subtype respectively. 1313 * 1314 * @since 4.9.8 1315 * 1316 * @param mixed $meta_value Metadata value to sanitize. 1317 * @param string $meta_key Metadata key. 1318 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1319 * or any other object type with an associated meta table. 1320 * @param string $object_subtype Object subtype. 1321 */ 1322 return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $meta_value, $meta_key, $object_type, $object_subtype ); 1323 } 1324 1325 /** 1326 * Filters the sanitization of a specific meta key of a specific meta type. 1327 * 1328 * The dynamic portions of the hook name, `$meta_type`, and `$meta_key`, 1329 * refer to the metadata object type (comment, post, term, or user) and the meta 1330 * key value, respectively. 1331 * 1332 * @since 3.3.0 1333 * 1334 * @param mixed $meta_value Metadata value to sanitize. 1335 * @param string $meta_key Metadata key. 1336 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1337 * or any other object type with an associated meta table. 1338 */ 1339 return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}", $meta_value, $meta_key, $object_type ); 1340 } 1341 1342 /** 1343 * Registers a meta key. 1344 * 1345 * It is recommended to register meta keys for a specific combination of object type and object subtype. If passing 1346 * an object subtype is omitted, the meta key will be registered for the entire object type, however it can be partly 1347 * overridden in case a more specific meta key of the same name exists for the same object type and a subtype. 1348 * 1349 * If an object type does not support any subtypes, such as users or comments, you should commonly call this function 1350 * without passing a subtype. 1351 * 1352 * @since 3.3.0 1353 * @since 4.6.0 {@link https://core.trac.wordpress.org/ticket/35658 Modified 1354 * to support an array of data to attach to registered meta keys}. Previous arguments for 1355 * `$sanitize_callback` and `$auth_callback` have been folded into this array. 1356 * @since 4.9.8 The `$object_subtype` argument was added to the arguments array. 1357 * @since 5.3.0 Valid meta types expanded to include "array" and "object". 1358 * @since 5.5.0 The `$default` argument was added to the arguments array. 1359 * 1360 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1361 * or any other object type with an associated meta table. 1362 * @param string $meta_key Meta key to register. 1363 * @param array $args { 1364 * Data used to describe the meta key when registered. 1365 * 1366 * @type string $object_subtype A subtype; e.g. if the object type is "post", the post type. If left empty, 1367 * the meta key will be registered on the entire object type. Default empty. 1368 * @type string $type The type of data associated with this meta key. 1369 * Valid values are 'string', 'boolean', 'integer', 'number', 'array', and 'object'. 1370 * @type string $description A description of the data attached to this meta key. 1371 * @type bool $single Whether the meta key has one value per object, or an array of values per object. 1372 * @type mixed $default The default value returned from get_metadata() if no value has been set yet. 1373 * When using a non-single meta key, the default value is for the first entry. 1374 * In other words, when calling get_metadata() with `$single` set to `false`, 1375 * the default value given here will be wrapped in an array. 1376 * @type callable $sanitize_callback A function or method to call when sanitizing `$meta_key` data. 1377 * @type callable $auth_callback Optional. A function or method to call when performing edit_post_meta, 1378 * add_post_meta, and delete_post_meta capability checks. 1379 * @type bool|array $show_in_rest Whether data associated with this meta key can be considered public and 1380 * should be accessible via the REST API. A custom post type must also declare 1381 * support for custom fields for registered meta to be accessible via REST. 1382 * When registering complex meta values this argument may optionally be an 1383 * array with 'schema' or 'prepare_callback' keys instead of a boolean. 1384 * } 1385 * @param string|array $deprecated Deprecated. Use `$args` instead. 1386 * @return bool True if the meta key was successfully registered in the global array, false if not. 1387 * Registering a meta key with distinct sanitize and auth callbacks will fire those callbacks, 1388 * but will not add to the global registry. 1389 */ 1390 function register_meta( $object_type, $meta_key, $args, $deprecated = null ) { 1391 global $wp_meta_keys; 1392 1393 if ( ! is_array( $wp_meta_keys ) ) { 1394 $wp_meta_keys = array(); 1395 } 1396 1397 $defaults = array( 1398 'object_subtype' => '', 1399 'type' => 'string', 1400 'description' => '', 1401 'default' => '', 1402 'single' => false, 1403 'sanitize_callback' => null, 1404 'auth_callback' => null, 1405 'show_in_rest' => false, 1406 ); 1407 1408 // There used to be individual args for sanitize and auth callbacks. 1409 $has_old_sanitize_cb = false; 1410 $has_old_auth_cb = false; 1411 1412 if ( is_callable( $args ) ) { 1413 $args = array( 1414 'sanitize_callback' => $args, 1415 ); 1416 1417 $has_old_sanitize_cb = true; 1418 } else { 1419 $args = (array) $args; 1420 } 1421 1422 if ( is_callable( $deprecated ) ) { 1423 $args['auth_callback'] = $deprecated; 1424 $has_old_auth_cb = true; 1425 } 1426 1427 /** 1428 * Filters the registration arguments when registering meta. 1429 * 1430 * @since 4.6.0 1431 * 1432 * @param array $args Array of meta registration arguments. 1433 * @param array $defaults Array of default arguments. 1434 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1435 * or any other object type with an associated meta table. 1436 * @param string $meta_key Meta key. 1437 */ 1438 $args = apply_filters( 'register_meta_args', $args, $defaults, $object_type, $meta_key ); 1439 unset( $defaults['default'] ); 1440 $args = wp_parse_args( $args, $defaults ); 1441 1442 // Require an item schema when registering array meta. 1443 if ( false !== $args['show_in_rest'] && 'array' === $args['type'] ) { 1444 if ( ! is_array( $args['show_in_rest'] ) || ! isset( $args['show_in_rest']['schema']['items'] ) ) { 1445 _doing_it_wrong( __FUNCTION__, __( 'When registering an "array" meta type to show in the REST API, you must specify the schema for each array item in "show_in_rest.schema.items".' ), '5.3.0' ); 1446 1447 return false; 1448 } 1449 } 1450 1451 $object_subtype = ! empty( $args['object_subtype'] ) ? $args['object_subtype'] : ''; 1452 1453 // If `auth_callback` is not provided, fall back to `is_protected_meta()`. 1454 if ( empty( $args['auth_callback'] ) ) { 1455 if ( is_protected_meta( $meta_key, $object_type ) ) { 1456 $args['auth_callback'] = '__return_false'; 1457 } else { 1458 $args['auth_callback'] = '__return_true'; 1459 } 1460 } 1461 1462 // Back-compat: old sanitize and auth callbacks are applied to all of an object type. 1463 if ( is_callable( $args['sanitize_callback'] ) ) { 1464 if ( ! empty( $object_subtype ) ) { 1465 add_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'], 10, 4 ); 1466 } else { 1467 add_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'], 10, 3 ); 1468 } 1469 } 1470 1471 if ( is_callable( $args['auth_callback'] ) ) { 1472 if ( ! empty( $object_subtype ) ) { 1473 add_filter( "auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['auth_callback'], 10, 6 ); 1474 } else { 1475 add_filter( "auth_{$object_type}_meta_{$meta_key}", $args['auth_callback'], 10, 6 ); 1476 } 1477 } 1478 1479 if ( array_key_exists( 'default', $args ) ) { 1480 $schema = $args; 1481 if ( is_array( $args['show_in_rest'] ) && isset( $args['show_in_rest']['schema'] ) ) { 1482 $schema = array_merge( $schema, $args['show_in_rest']['schema'] ); 1483 } 1484 1485 $check = rest_validate_value_from_schema( $args['default'], $schema ); 1486 if ( is_wp_error( $check ) ) { 1487 _doing_it_wrong( __FUNCTION__, __( 'When registering a default meta value the data must match the type provided.' ), '5.5.0' ); 1488 1489 return false; 1490 } 1491 1492 if ( ! has_filter( "default_{$object_type}_metadata", 'filter_default_metadata' ) ) { 1493 add_filter( "default_{$object_type}_metadata", 'filter_default_metadata', 10, 5 ); 1494 } 1495 } 1496 1497 // Global registry only contains meta keys registered with the array of arguments added in 4.6.0. 1498 if ( ! $has_old_auth_cb && ! $has_old_sanitize_cb ) { 1499 unset( $args['object_subtype'] ); 1500 1501 $wp_meta_keys[ $object_type ][ $object_subtype ][ $meta_key ] = $args; 1502 1503 return true; 1504 } 1505 1506 return false; 1507 } 1508 1509 /** 1510 * Filters into default_{$object_type}_metadata and adds in default value. 1511 * 1512 * @since 5.5.0 1513 * 1514 * @param mixed $value Current value passed to filter. 1515 * @param int $object_id ID of the object metadata is for. 1516 * @param string $meta_key Metadata key. 1517 * @param bool $single If true, return only the first value of the specified `$meta_key`. 1518 * This parameter has no effect if `$meta_key` is not specified. 1519 * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1520 * or any other object type with an associated meta table. 1521 * @return mixed An array of default values if `$single` is false. 1522 * The default value of the meta field if `$single` is true. 1523 */ 1524 function filter_default_metadata( $value, $object_id, $meta_key, $single, $meta_type ) { 1525 global $wp_meta_keys; 1526 1527 if ( wp_installing() ) { 1528 return $value; 1529 } 1530 1531 if ( ! is_array( $wp_meta_keys ) || ! isset( $wp_meta_keys[ $meta_type ] ) ) { 1532 return $value; 1533 } 1534 1535 $defaults = array(); 1536 foreach ( $wp_meta_keys[ $meta_type ] as $sub_type => $meta_data ) { 1537 foreach ( $meta_data as $_meta_key => $args ) { 1538 if ( $_meta_key === $meta_key && array_key_exists( 'default', $args ) ) { 1539 $defaults[ $sub_type ] = $args; 1540 } 1541 } 1542 } 1543 1544 if ( ! $defaults ) { 1545 return $value; 1546 } 1547 1548 // If this meta type does not have subtypes, then the default is keyed as an empty string. 1549 if ( isset( $defaults[''] ) ) { 1550 $metadata = $defaults['']; 1551 } else { 1552 $sub_type = get_object_subtype( $meta_type, $object_id ); 1553 if ( ! isset( $defaults[ $sub_type ] ) ) { 1554 return $value; 1555 } 1556 $metadata = $defaults[ $sub_type ]; 1557 } 1558 1559 if ( $single ) { 1560 $value = $metadata['default']; 1561 } else { 1562 $value = array( $metadata['default'] ); 1563 } 1564 1565 return $value; 1566 } 1567 1568 /** 1569 * Checks if a meta key is registered. 1570 * 1571 * @since 4.6.0 1572 * @since 4.9.8 The `$object_subtype` parameter was added. 1573 * 1574 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1575 * or any other object type with an associated meta table. 1576 * @param string $meta_key Metadata key. 1577 * @param string $object_subtype Optional. The subtype of the object type. 1578 * @return bool True if the meta key is registered to the object type and, if provided, 1579 * the object subtype. False if not. 1580 */ 1581 function registered_meta_key_exists( $object_type, $meta_key, $object_subtype = '' ) { 1582 $meta_keys = get_registered_meta_keys( $object_type, $object_subtype ); 1583 1584 return isset( $meta_keys[ $meta_key ] ); 1585 } 1586 1587 /** 1588 * Unregisters a meta key from the list of registered keys. 1589 * 1590 * @since 4.6.0 1591 * @since 4.9.8 The `$object_subtype` parameter was added. 1592 * 1593 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1594 * or any other object type with an associated meta table. 1595 * @param string $meta_key Metadata key. 1596 * @param string $object_subtype Optional. The subtype of the object type. 1597 * @return bool True if successful. False if the meta key was not registered. 1598 */ 1599 function unregister_meta_key( $object_type, $meta_key, $object_subtype = '' ) { 1600 global $wp_meta_keys; 1601 1602 if ( ! registered_meta_key_exists( $object_type, $meta_key, $object_subtype ) ) { 1603 return false; 1604 } 1605 1606 $args = $wp_meta_keys[ $object_type ][ $object_subtype ][ $meta_key ]; 1607 1608 if ( isset( $args['sanitize_callback'] ) && is_callable( $args['sanitize_callback'] ) ) { 1609 if ( ! empty( $object_subtype ) ) { 1610 remove_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'] ); 1611 } else { 1612 remove_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'] ); 1613 } 1614 } 1615 1616 if ( isset( $args['auth_callback'] ) && is_callable( $args['auth_callback'] ) ) { 1617 if ( ! empty( $object_subtype ) ) { 1618 remove_filter( "auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['auth_callback'] ); 1619 } else { 1620 remove_filter( "auth_{$object_type}_meta_{$meta_key}", $args['auth_callback'] ); 1621 } 1622 } 1623 1624 unset( $wp_meta_keys[ $object_type ][ $object_subtype ][ $meta_key ] ); 1625 1626 // Do some clean up. 1627 if ( empty( $wp_meta_keys[ $object_type ][ $object_subtype ] ) ) { 1628 unset( $wp_meta_keys[ $object_type ][ $object_subtype ] ); 1629 } 1630 if ( empty( $wp_meta_keys[ $object_type ] ) ) { 1631 unset( $wp_meta_keys[ $object_type ] ); 1632 } 1633 1634 return true; 1635 } 1636 1637 /** 1638 * Retrieves a list of registered meta keys for an object type. 1639 * 1640 * @since 4.6.0 1641 * @since 4.9.8 The `$object_subtype` parameter was added. 1642 * 1643 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1644 * or any other object type with an associated meta table. 1645 * @param string $object_subtype Optional. The subtype of the object type. 1646 * @return string[] List of registered meta keys. 1647 */ 1648 function get_registered_meta_keys( $object_type, $object_subtype = '' ) { 1649 global $wp_meta_keys; 1650 1651 if ( ! is_array( $wp_meta_keys ) || ! isset( $wp_meta_keys[ $object_type ] ) || ! isset( $wp_meta_keys[ $object_type ][ $object_subtype ] ) ) { 1652 return array(); 1653 } 1654 1655 return $wp_meta_keys[ $object_type ][ $object_subtype ]; 1656 } 1657 1658 /** 1659 * Retrieves registered metadata for a specified object. 1660 * 1661 * The results include both meta that is registered specifically for the 1662 * object's subtype and meta that is registered for the entire object type. 1663 * 1664 * @since 4.6.0 1665 * 1666 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1667 * or any other object type with an associated meta table. 1668 * @param int $object_id ID of the object the metadata is for. 1669 * @param string $meta_key Optional. Registered metadata key. If not specified, retrieve all registered 1670 * metadata for the specified object. 1671 * @return mixed A single value or array of values for a key if specified. An array of all registered keys 1672 * and values for an object ID if not. False if a given $meta_key is not registered. 1673 */ 1674 function get_registered_metadata( $object_type, $object_id, $meta_key = '' ) { 1675 $object_subtype = get_object_subtype( $object_type, $object_id ); 1676 1677 if ( ! empty( $meta_key ) ) { 1678 if ( ! empty( $object_subtype ) && ! registered_meta_key_exists( $object_type, $meta_key, $object_subtype ) ) { 1679 $object_subtype = ''; 1680 } 1681 1682 if ( ! registered_meta_key_exists( $object_type, $meta_key, $object_subtype ) ) { 1683 return false; 1684 } 1685 1686 $meta_keys = get_registered_meta_keys( $object_type, $object_subtype ); 1687 $meta_key_data = $meta_keys[ $meta_key ]; 1688 1689 $data = get_metadata( $object_type, $object_id, $meta_key, $meta_key_data['single'] ); 1690 1691 return $data; 1692 } 1693 1694 $data = get_metadata( $object_type, $object_id ); 1695 if ( ! $data ) { 1696 return array(); 1697 } 1698 1699 $meta_keys = get_registered_meta_keys( $object_type ); 1700 if ( ! empty( $object_subtype ) ) { 1701 $meta_keys = array_merge( $meta_keys, get_registered_meta_keys( $object_type, $object_subtype ) ); 1702 } 1703 1704 return array_intersect_key( $data, $meta_keys ); 1705 } 1706 1707 /** 1708 * Filters out `register_meta()` args based on an allowed list. 1709 * 1710 * `register_meta()` args may change over time, so requiring the allowed list 1711 * to be explicitly turned off is a warranty seal of sorts. 1712 * 1713 * @access private 1714 * @since 5.5.0 1715 * 1716 * @param array $args Arguments from `register_meta()`. 1717 * @param array $default_args Default arguments for `register_meta()`. 1718 * @return array Filtered arguments. 1719 */ 1720 function _wp_register_meta_args_allowed_list( $args, $default_args ) { 1721 return array_intersect_key( $args, $default_args ); 1722 } 1723 1724 /** 1725 * Returns the object subtype for a given object ID of a specific type. 1726 * 1727 * @since 4.9.8 1728 * 1729 * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', 1730 * or any other object type with an associated meta table. 1731 * @param int $object_id ID of the object to retrieve its subtype. 1732 * @return string The object subtype or an empty string if unspecified subtype. 1733 */ 1734 function get_object_subtype( $object_type, $object_id ) { 1735 $object_id = (int) $object_id; 1736 $object_subtype = ''; 1737 1738 switch ( $object_type ) { 1739 case 'post': 1740 $post_type = get_post_type( $object_id ); 1741 1742 if ( ! empty( $post_type ) ) { 1743 $object_subtype = $post_type; 1744 } 1745 break; 1746 1747 case 'term': 1748 $term = get_term( $object_id ); 1749 if ( ! $term instanceof WP_Term ) { 1750 break; 1751 } 1752 1753 $object_subtype = $term->taxonomy; 1754 break; 1755 1756 case 'comment': 1757 $comment = get_comment( $object_id ); 1758 if ( ! $comment ) { 1759 break; 1760 } 1761 1762 $object_subtype = 'comment'; 1763 break; 1764 1765 case 'user': 1766 $user = get_user_by( 'id', $object_id ); 1767 if ( ! $user ) { 1768 break; 1769 } 1770 1771 $object_subtype = 'user'; 1772 break; 1773 } 1774 1775 /** 1776 * Filters the object subtype identifier for a non-standard object type. 1777 * 1778 * The dynamic portion of the hook name, `$object_type`, refers to the meta object type 1779 * (post, comment, term, user, or any other type with an associated meta table). 1780 * 1781 * Possible hook names include: 1782 * 1783 * - `get_object_subtype_post` 1784 * - `get_object_subtype_comment` 1785 * - `get_object_subtype_term` 1786 * - `get_object_subtype_user` 1787 * 1788 * @since 4.9.8 1789 * 1790 * @param string $object_subtype Empty string to override. 1791 * @param int $object_id ID of the object to get the subtype for. 1792 */ 1793 return apply_filters( "get_object_subtype_{$object_type}", $object_subtype, $object_id ); 1794 }
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