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1 <?php 2 /** 3 * Meta API: WP_Meta_Query class 4 * 5 * @package WordPress 6 * @subpackage Meta 7 * @since 4.4.0 8 */ 9 10 /** 11 * Core class used to implement meta queries for the Meta API. 12 * 13 * Used for generating SQL clauses that filter a primary query according to metadata keys and values. 14 * 15 * WP_Meta_Query is a helper that allows primary query classes, such as WP_Query and WP_User_Query, 16 * 17 * to filter their results by object metadata, by generating `JOIN` and `WHERE` subclauses to be attached 18 * to the primary SQL query string. 19 * 20 * @since 3.2.0 21 */ 22 #[AllowDynamicProperties] 23 class WP_Meta_Query { 24 /** 25 * Array of metadata queries. 26 * 27 * See WP_Meta_Query::__construct() for information on meta query arguments. 28 * 29 * @since 3.2.0 30 * @var array 31 */ 32 public $queries = array(); 33 34 /** 35 * The relation between the queries. Can be one of 'AND' or 'OR'. 36 * 37 * @since 3.2.0 38 * @var string 39 */ 40 public $relation; 41 42 /** 43 * Database table to query for the metadata. 44 * 45 * @since 4.1.0 46 * @var string 47 */ 48 public $meta_table; 49 50 /** 51 * Column in meta_table that represents the ID of the object the metadata belongs to. 52 * 53 * @since 4.1.0 54 * @var string 55 */ 56 public $meta_id_column; 57 58 /** 59 * Database table that where the metadata's objects are stored (eg $wpdb->users). 60 * 61 * @since 4.1.0 62 * @var string 63 */ 64 public $primary_table; 65 66 /** 67 * Column in primary_table that represents the ID of the object. 68 * 69 * @since 4.1.0 70 * @var string 71 */ 72 public $primary_id_column; 73 74 /** 75 * A flat list of table aliases used in JOIN clauses. 76 * 77 * @since 4.1.0 78 * @var array 79 */ 80 protected $table_aliases = array(); 81 82 /** 83 * A flat list of clauses, keyed by clause 'name'. 84 * 85 * @since 4.2.0 86 * @var array 87 */ 88 protected $clauses = array(); 89 90 /** 91 * Whether the query contains any OR relations. 92 * 93 * @since 4.3.0 94 * @var bool 95 */ 96 protected $has_or_relation = false; 97 98 /** 99 * Constructor. 100 * 101 * @since 3.2.0 102 * @since 4.2.0 Introduced support for naming query clauses by associative array keys. 103 * @since 5.1.0 Introduced `$compare_key` clause parameter, which enables LIKE key matches. 104 * @since 5.3.0 Increased the number of operators available to `$compare_key`. Introduced `$type_key`, 105 * which enables the `$key` to be cast to a new data type for comparisons. 106 * 107 * @param array $meta_query { 108 * Array of meta query clauses. When first-order clauses or sub-clauses use strings as 109 * their array keys, they may be referenced in the 'orderby' parameter of the parent query. 110 * 111 * @type string $relation Optional. The MySQL keyword used to join the clauses of the query. 112 * Accepts 'AND' or 'OR'. Default 'AND'. 113 * @type array ...$0 { 114 * Optional. An array of first-order clause parameters, or another fully-formed meta query. 115 * 116 * @type string|string[] $key Meta key or keys to filter by. 117 * @type string $compare_key MySQL operator used for comparing the $key. Accepts: 118 * - '=' 119 * - '!=' 120 * - 'LIKE' 121 * - 'NOT LIKE' 122 * - 'IN' 123 * - 'NOT IN' 124 * - 'REGEXP' 125 * - 'NOT REGEXP' 126 * - 'RLIKE' 127 * - 'EXISTS' (alias of '=') 128 * - 'NOT EXISTS' (alias of '!=') 129 * Default is 'IN' when `$key` is an array, '=' otherwise. 130 * @type string $type_key MySQL data type that the meta_key column will be CAST to for 131 * comparisons. Accepts 'BINARY' for case-sensitive regular expression 132 * comparisons. Default is ''. 133 * @type string|string[] $value Meta value or values to filter by. 134 * @type string $compare MySQL operator used for comparing the $value. Accepts: 135 * - '=' 136 * - '!=' 137 * - '>' 138 * - '>=' 139 * - '<' 140 * - '<=' 141 * - 'LIKE' 142 * - 'NOT LIKE' 143 * - 'IN' 144 * - 'NOT IN' 145 * - 'BETWEEN' 146 * - 'NOT BETWEEN' 147 * - 'REGEXP' 148 * - 'NOT REGEXP' 149 * - 'RLIKE' 150 * - 'EXISTS' 151 * - 'NOT EXISTS' 152 * Default is 'IN' when `$value` is an array, '=' otherwise. 153 * @type string $type MySQL data type that the meta_value column will be CAST to for 154 * comparisons. Accepts: 155 * - 'NUMERIC' 156 * - 'BINARY' 157 * - 'CHAR' 158 * - 'DATE' 159 * - 'DATETIME' 160 * - 'DECIMAL' 161 * - 'SIGNED' 162 * - 'TIME' 163 * - 'UNSIGNED' 164 * Default is 'CHAR'. 165 * } 166 * } 167 */ 168 public function __construct( $meta_query = array() ) { 169 if ( ! $meta_query ) { 170 return; 171 } 172 173 if ( isset( $meta_query['relation'] ) && 'OR' === strtoupper( $meta_query['relation'] ) ) { 174 $this->relation = 'OR'; 175 } else { 176 $this->relation = 'AND'; 177 } 178 179 $this->queries = $this->sanitize_query( $meta_query ); 180 } 181 182 /** 183 * Ensures the 'meta_query' argument passed to the class constructor is well-formed. 184 * 185 * Eliminates empty items and ensures that a 'relation' is set. 186 * 187 * @since 4.1.0 188 * 189 * @param array $queries Array of query clauses. 190 * @return array Sanitized array of query clauses. 191 */ 192 public function sanitize_query( $queries ) { 193 $clean_queries = array(); 194 195 if ( ! is_array( $queries ) ) { 196 return $clean_queries; 197 } 198 199 foreach ( $queries as $key => $query ) { 200 if ( 'relation' === $key ) { 201 $relation = $query; 202 203 } elseif ( ! is_array( $query ) ) { 204 continue; 205 206 // First-order clause. 207 } elseif ( $this->is_first_order_clause( $query ) ) { 208 if ( isset( $query['value'] ) && array() === $query['value'] ) { 209 unset( $query['value'] ); 210 } 211 212 $clean_queries[ $key ] = $query; 213 214 // Otherwise, it's a nested query, so we recurse. 215 } else { 216 $cleaned_query = $this->sanitize_query( $query ); 217 218 if ( ! empty( $cleaned_query ) ) { 219 $clean_queries[ $key ] = $cleaned_query; 220 } 221 } 222 } 223 224 if ( empty( $clean_queries ) ) { 225 return $clean_queries; 226 } 227 228 // Sanitize the 'relation' key provided in the query. 229 if ( isset( $relation ) && 'OR' === strtoupper( $relation ) ) { 230 $clean_queries['relation'] = 'OR'; 231 $this->has_or_relation = true; 232 233 /* 234 * If there is only a single clause, call the relation 'OR'. 235 * This value will not actually be used to join clauses, but it 236 * simplifies the logic around combining key-only queries. 237 */ 238 } elseif ( 1 === count( $clean_queries ) ) { 239 $clean_queries['relation'] = 'OR'; 240 241 // Default to AND. 242 } else { 243 $clean_queries['relation'] = 'AND'; 244 } 245 246 return $clean_queries; 247 } 248 249 /** 250 * Determines whether a query clause is first-order. 251 * 252 * A first-order meta query clause is one that has either a 'key' or 253 * a 'value' array key. 254 * 255 * @since 4.1.0 256 * 257 * @param array $query Meta query arguments. 258 * @return bool Whether the query clause is a first-order clause. 259 */ 260 protected function is_first_order_clause( $query ) { 261 return isset( $query['key'] ) || isset( $query['value'] ); 262 } 263 264 /** 265 * Constructs a meta query based on 'meta_*' query vars 266 * 267 * @since 3.2.0 268 * 269 * @param array $qv The query variables. 270 */ 271 public function parse_query_vars( $qv ) { 272 $meta_query = array(); 273 274 /* 275 * For orderby=meta_value to work correctly, simple query needs to be 276 * first (so that its table join is against an unaliased meta table) and 277 * needs to be its own clause (so it doesn't interfere with the logic of 278 * the rest of the meta_query). 279 */ 280 $primary_meta_query = array(); 281 foreach ( array( 'key', 'compare', 'type', 'compare_key', 'type_key' ) as $key ) { 282 if ( ! empty( $qv[ "meta_$key" ] ) ) { 283 $primary_meta_query[ $key ] = $qv[ "meta_$key" ]; 284 } 285 } 286 287 // WP_Query sets 'meta_value' = '' by default. 288 if ( isset( $qv['meta_value'] ) && '' !== $qv['meta_value'] && ( ! is_array( $qv['meta_value'] ) || $qv['meta_value'] ) ) { 289 $primary_meta_query['value'] = $qv['meta_value']; 290 } 291 292 $existing_meta_query = isset( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ? $qv['meta_query'] : array(); 293 294 if ( ! empty( $primary_meta_query ) && ! empty( $existing_meta_query ) ) { 295 $meta_query = array( 296 'relation' => 'AND', 297 $primary_meta_query, 298 $existing_meta_query, 299 ); 300 } elseif ( ! empty( $primary_meta_query ) ) { 301 $meta_query = array( 302 $primary_meta_query, 303 ); 304 } elseif ( ! empty( $existing_meta_query ) ) { 305 $meta_query = $existing_meta_query; 306 } 307 308 $this->__construct( $meta_query ); 309 } 310 311 /** 312 * Returns the appropriate alias for the given meta type if applicable. 313 * 314 * @since 3.7.0 315 * 316 * @param string $type MySQL type to cast meta_value. 317 * @return string MySQL type. 318 */ 319 public function get_cast_for_type( $type = '' ) { 320 if ( empty( $type ) ) { 321 return 'CHAR'; 322 } 323 324 $meta_type = strtoupper( $type ); 325 326 if ( ! preg_match( '/^(?:BINARY|CHAR|DATE|DATETIME|SIGNED|UNSIGNED|TIME|NUMERIC(?:\(\d+(?:,\s?\d+)?\))?|DECIMAL(?:\(\d+(?:,\s?\d+)?\))?)$/', $meta_type ) ) { 327 return 'CHAR'; 328 } 329 330 if ( 'NUMERIC' === $meta_type ) { 331 $meta_type = 'SIGNED'; 332 } 333 334 return $meta_type; 335 } 336 337 /** 338 * Generates SQL clauses to be appended to a main query. 339 * 340 * @since 3.2.0 341 * 342 * @param string $type Type of meta. Possible values include but are not limited 343 * to 'post', 'comment', 'blog', 'term', and 'user'. 344 * @param string $primary_table Database table where the object being filtered is stored (eg wp_users). 345 * @param string $primary_id_column ID column for the filtered object in $primary_table. 346 * @param object $context Optional. The main query object that corresponds to the type, for 347 * example a `WP_Query`, `WP_User_Query`, or `WP_Site_Query`. 348 * Default null. 349 * @return string[]|false { 350 * Array containing JOIN and WHERE SQL clauses to append to the main query, 351 * or false if no table exists for the requested meta type. 352 * 353 * @type string $join SQL fragment to append to the main JOIN clause. 354 * @type string $where SQL fragment to append to the main WHERE clause. 355 * } 356 */ 357 public function get_sql( $type, $primary_table, $primary_id_column, $context = null ) { 358 $meta_table = _get_meta_table( $type ); 359 if ( ! $meta_table ) { 360 return false; 361 } 362 363 $this->table_aliases = array(); 364 365 $this->meta_table = $meta_table; 366 $this->meta_id_column = sanitize_key( $type . '_id' ); 367 368 $this->primary_table = $primary_table; 369 $this->primary_id_column = $primary_id_column; 370 371 $sql = $this->get_sql_clauses(); 372 373 /* 374 * If any JOINs are LEFT JOINs (as in the case of NOT EXISTS), then all JOINs should 375 * be LEFT. Otherwise posts with no metadata will be excluded from results. 376 */ 377 if ( str_contains( $sql['join'], 'LEFT JOIN' ) ) { 378 $sql['join'] = str_replace( 'INNER JOIN', 'LEFT JOIN', $sql['join'] ); 379 } 380 381 /** 382 * Filters the meta query's generated SQL. 383 * 384 * @since 3.1.0 385 * 386 * @param string[] $sql Array containing the query's JOIN and WHERE clauses. 387 * @param array $queries Array of meta queries. 388 * @param string $type Type of meta. Possible values include but are not limited 389 * to 'post', 'comment', 'blog', 'term', and 'user'. 390 * @param string $primary_table Primary table. 391 * @param string $primary_id_column Primary column ID. 392 * @param object $context The main query object that corresponds to the type, for 393 * example a `WP_Query`, `WP_User_Query`, or `WP_Site_Query`. 394 */ 395 return apply_filters_ref_array( 'get_meta_sql', array( $sql, $this->queries, $type, $primary_table, $primary_id_column, $context ) ); 396 } 397 398 /** 399 * Generates SQL clauses to be appended to a main query. 400 * 401 * Called by the public WP_Meta_Query::get_sql(), this method is abstracted 402 * out to maintain parity with the other Query classes. 403 * 404 * @since 4.1.0 405 * 406 * @return string[] { 407 * Array containing JOIN and WHERE SQL clauses to append to the main query. 408 * 409 * @type string $join SQL fragment to append to the main JOIN clause. 410 * @type string $where SQL fragment to append to the main WHERE clause. 411 * } 412 */ 413 protected function get_sql_clauses() { 414 /* 415 * $queries are passed by reference to get_sql_for_query() for recursion. 416 * To keep $this->queries unaltered, pass a copy. 417 */ 418 $queries = $this->queries; 419 $sql = $this->get_sql_for_query( $queries ); 420 421 if ( ! empty( $sql['where'] ) ) { 422 $sql['where'] = ' AND ' . $sql['where']; 423 } 424 425 return $sql; 426 } 427 428 /** 429 * Generates SQL clauses for a single query array. 430 * 431 * If nested subqueries are found, this method recurses the tree to 432 * produce the properly nested SQL. 433 * 434 * @since 4.1.0 435 * 436 * @param array $query Query to parse (passed by reference). 437 * @param int $depth Optional. Number of tree levels deep we currently are. 438 * Used to calculate indentation. Default 0. 439 * @return string[] { 440 * Array containing JOIN and WHERE SQL clauses to append to a single query array. 441 * 442 * @type string $join SQL fragment to append to the main JOIN clause. 443 * @type string $where SQL fragment to append to the main WHERE clause. 444 * } 445 */ 446 protected function get_sql_for_query( &$query, $depth = 0 ) { 447 $sql_chunks = array( 448 'join' => array(), 449 'where' => array(), 450 ); 451 452 $sql = array( 453 'join' => '', 454 'where' => '', 455 ); 456 457 $indent = ''; 458 for ( $i = 0; $i < $depth; $i++ ) { 459 $indent .= ' '; 460 } 461 462 foreach ( $query as $key => &$clause ) { 463 if ( 'relation' === $key ) { 464 $relation = $query['relation']; 465 } elseif ( is_array( $clause ) ) { 466 467 // This is a first-order clause. 468 if ( $this->is_first_order_clause( $clause ) ) { 469 $clause_sql = $this->get_sql_for_clause( $clause, $query, $key ); 470 471 $where_count = count( $clause_sql['where'] ); 472 if ( ! $where_count ) { 473 $sql_chunks['where'][] = ''; 474 } elseif ( 1 === $where_count ) { 475 $sql_chunks['where'][] = $clause_sql['where'][0]; 476 } else { 477 $sql_chunks['where'][] = '( ' . implode( ' AND ', $clause_sql['where'] ) . ' )'; 478 } 479 480 $sql_chunks['join'] = array_merge( $sql_chunks['join'], $clause_sql['join'] ); 481 // This is a subquery, so we recurse. 482 } else { 483 $clause_sql = $this->get_sql_for_query( $clause, $depth + 1 ); 484 485 $sql_chunks['where'][] = $clause_sql['where']; 486 $sql_chunks['join'][] = $clause_sql['join']; 487 } 488 } 489 } 490 491 // Filter to remove empties. 492 $sql_chunks['join'] = array_filter( $sql_chunks['join'] ); 493 $sql_chunks['where'] = array_filter( $sql_chunks['where'] ); 494 495 if ( empty( $relation ) ) { 496 $relation = 'AND'; 497 } 498 499 // Filter duplicate JOIN clauses and combine into a single string. 500 if ( ! empty( $sql_chunks['join'] ) ) { 501 $sql['join'] = implode( ' ', array_unique( $sql_chunks['join'] ) ); 502 } 503 504 // Generate a single WHERE clause with proper brackets and indentation. 505 if ( ! empty( $sql_chunks['where'] ) ) { 506 $sql['where'] = '( ' . "\n " . $indent . implode( ' ' . "\n " . $indent . $relation . ' ' . "\n " . $indent, $sql_chunks['where'] ) . "\n" . $indent . ')'; 507 } 508 509 return $sql; 510 } 511 512 /** 513 * Generates SQL JOIN and WHERE clauses for a first-order query clause. 514 * 515 * "First-order" means that it's an array with a 'key' or 'value'. 516 * 517 * @since 4.1.0 518 * 519 * @global wpdb $wpdb WordPress database abstraction object. 520 * 521 * @param array $clause Query clause (passed by reference). 522 * @param array $parent_query Parent query array. 523 * @param string $clause_key Optional. The array key used to name the clause in the original `$meta_query` 524 * parameters. If not provided, a key will be generated automatically. 525 * Default empty string. 526 * @return array { 527 * Array containing JOIN and WHERE SQL clauses to append to a first-order query. 528 * 529 * @type string[] $join Array of SQL fragments to append to the main JOIN clause. 530 * @type string[] $where Array of SQL fragments to append to the main WHERE clause. 531 * } 532 */ 533 public function get_sql_for_clause( &$clause, $parent_query, $clause_key = '' ) { 534 global $wpdb; 535 536 $sql_chunks = array( 537 'where' => array(), 538 'join' => array(), 539 ); 540 541 if ( isset( $clause['compare'] ) ) { 542 $clause['compare'] = strtoupper( $clause['compare'] ); 543 } else { 544 $clause['compare'] = isset( $clause['value'] ) && is_array( $clause['value'] ) ? 'IN' : '='; 545 } 546 547 $non_numeric_operators = array( 548 '=', 549 '!=', 550 'LIKE', 551 'NOT LIKE', 552 'IN', 553 'NOT IN', 554 'EXISTS', 555 'NOT EXISTS', 556 'RLIKE', 557 'REGEXP', 558 'NOT REGEXP', 559 ); 560 561 $numeric_operators = array( 562 '>', 563 '>=', 564 '<', 565 '<=', 566 'BETWEEN', 567 'NOT BETWEEN', 568 ); 569 570 if ( ! in_array( $clause['compare'], $non_numeric_operators, true ) && ! in_array( $clause['compare'], $numeric_operators, true ) ) { 571 $clause['compare'] = '='; 572 } 573 574 if ( isset( $clause['compare_key'] ) ) { 575 $clause['compare_key'] = strtoupper( $clause['compare_key'] ); 576 } else { 577 $clause['compare_key'] = isset( $clause['key'] ) && is_array( $clause['key'] ) ? 'IN' : '='; 578 } 579 580 if ( ! in_array( $clause['compare_key'], $non_numeric_operators, true ) ) { 581 $clause['compare_key'] = '='; 582 } 583 584 $meta_compare = $clause['compare']; 585 $meta_compare_key = $clause['compare_key']; 586 587 // First build the JOIN clause, if one is required. 588 $join = ''; 589 590 // We prefer to avoid joins if possible. Look for an existing join compatible with this clause. 591 $alias = $this->find_compatible_table_alias( $clause, $parent_query ); 592 if ( false === $alias ) { 593 $i = count( $this->table_aliases ); 594 $alias = $i ? 'mt' . $i : $this->meta_table; 595 596 // JOIN clauses for NOT EXISTS have their own syntax. 597 if ( 'NOT EXISTS' === $meta_compare ) { 598 $join .= " LEFT JOIN $this->meta_table"; 599 $join .= $i ? " AS $alias" : ''; 600 601 if ( 'LIKE' === $meta_compare_key ) { 602 $join .= $wpdb->prepare( " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column AND $alias.meta_key LIKE %s )", '%' . $wpdb->esc_like( $clause['key'] ) . '%' ); 603 } else { 604 $join .= $wpdb->prepare( " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column AND $alias.meta_key = %s )", $clause['key'] ); 605 } 606 607 // All other JOIN clauses. 608 } else { 609 $join .= " INNER JOIN $this->meta_table"; 610 $join .= $i ? " AS $alias" : ''; 611 $join .= " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column )"; 612 } 613 614 $this->table_aliases[] = $alias; 615 $sql_chunks['join'][] = $join; 616 } 617 618 // Save the alias to this clause, for future siblings to find. 619 $clause['alias'] = $alias; 620 621 // Determine the data type. 622 $_meta_type = isset( $clause['type'] ) ? $clause['type'] : ''; 623 $meta_type = $this->get_cast_for_type( $_meta_type ); 624 $clause['cast'] = $meta_type; 625 626 // Fallback for clause keys is the table alias. Key must be a string. 627 if ( is_int( $clause_key ) || ! $clause_key ) { 628 $clause_key = $clause['alias']; 629 } 630 631 // Ensure unique clause keys, so none are overwritten. 632 $iterator = 1; 633 $clause_key_base = $clause_key; 634 while ( isset( $this->clauses[ $clause_key ] ) ) { 635 $clause_key = $clause_key_base . '-' . $iterator; 636 ++$iterator; 637 } 638 639 // Store the clause in our flat array. 640 $this->clauses[ $clause_key ] =& $clause; 641 642 // Next, build the WHERE clause. 643 644 // meta_key. 645 if ( array_key_exists( 'key', $clause ) ) { 646 if ( 'NOT EXISTS' === $meta_compare ) { 647 $sql_chunks['where'][] = $alias . '.' . $this->meta_id_column . ' IS NULL'; 648 } else { 649 /** 650 * In joined clauses negative operators have to be nested into a 651 * NOT EXISTS clause and flipped, to avoid returning records with 652 * matching post IDs but different meta keys. Here we prepare the 653 * nested clause. 654 */ 655 if ( in_array( $meta_compare_key, array( '!=', 'NOT IN', 'NOT LIKE', 'NOT EXISTS', 'NOT REGEXP' ), true ) ) { 656 // Negative clauses may be reused. 657 $i = count( $this->table_aliases ); 658 $subquery_alias = $i ? 'mt' . $i : $this->meta_table; 659 $this->table_aliases[] = $subquery_alias; 660 661 $meta_compare_string_start = 'NOT EXISTS ('; 662 $meta_compare_string_start .= "SELECT 1 FROM $wpdb->postmeta $subquery_alias "; 663 $meta_compare_string_start .= "WHERE $subquery_alias.post_ID = $alias.post_ID "; 664 $meta_compare_string_end = 'LIMIT 1'; 665 $meta_compare_string_end .= ')'; 666 } 667 668 switch ( $meta_compare_key ) { 669 case '=': 670 case 'EXISTS': 671 $where = $wpdb->prepare( "$alias.meta_key = %s", trim( $clause['key'] ) ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared 672 break; 673 case 'LIKE': 674 $meta_compare_value = '%' . $wpdb->esc_like( trim( $clause['key'] ) ) . '%'; 675 $where = $wpdb->prepare( "$alias.meta_key LIKE %s", $meta_compare_value ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared 676 break; 677 case 'IN': 678 $meta_compare_string = "$alias.meta_key IN (" . substr( str_repeat( ',%s', count( $clause['key'] ) ), 1 ) . ')'; 679 $where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared 680 break; 681 case 'RLIKE': 682 case 'REGEXP': 683 $operator = $meta_compare_key; 684 if ( isset( $clause['type_key'] ) && 'BINARY' === strtoupper( $clause['type_key'] ) ) { 685 $cast = 'BINARY'; 686 $meta_key = "CAST($alias.meta_key AS BINARY)"; 687 } else { 688 $cast = ''; 689 $meta_key = "$alias.meta_key"; 690 } 691 $where = $wpdb->prepare( "$meta_key $operator $cast %s", trim( $clause['key'] ) ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared 692 break; 693 694 case '!=': 695 case 'NOT EXISTS': 696 $meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key = %s " . $meta_compare_string_end; 697 $where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared 698 break; 699 case 'NOT LIKE': 700 $meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key LIKE %s " . $meta_compare_string_end; 701 702 $meta_compare_value = '%' . $wpdb->esc_like( trim( $clause['key'] ) ) . '%'; 703 $where = $wpdb->prepare( $meta_compare_string, $meta_compare_value ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared 704 break; 705 case 'NOT IN': 706 $array_subclause = '(' . substr( str_repeat( ',%s', count( $clause['key'] ) ), 1 ) . ') '; 707 $meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key IN " . $array_subclause . $meta_compare_string_end; 708 $where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared 709 break; 710 case 'NOT REGEXP': 711 $operator = $meta_compare_key; 712 if ( isset( $clause['type_key'] ) && 'BINARY' === strtoupper( $clause['type_key'] ) ) { 713 $cast = 'BINARY'; 714 $meta_key = "CAST($subquery_alias.meta_key AS BINARY)"; 715 } else { 716 $cast = ''; 717 $meta_key = "$subquery_alias.meta_key"; 718 } 719 720 $meta_compare_string = $meta_compare_string_start . "AND $meta_key REGEXP $cast %s " . $meta_compare_string_end; 721 $where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared 722 break; 723 } 724 725 $sql_chunks['where'][] = $where; 726 } 727 } 728 729 // meta_value. 730 if ( array_key_exists( 'value', $clause ) ) { 731 $meta_value = $clause['value']; 732 733 if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ), true ) ) { 734 if ( ! is_array( $meta_value ) ) { 735 $meta_value = preg_split( '/[,\s]+/', $meta_value ); 736 } 737 } elseif ( is_string( $meta_value ) ) { 738 $meta_value = trim( $meta_value ); 739 } 740 741 switch ( $meta_compare ) { 742 case 'IN': 743 case 'NOT IN': 744 $meta_compare_string = '(' . substr( str_repeat( ',%s', count( $meta_value ) ), 1 ) . ')'; 745 $where = $wpdb->prepare( $meta_compare_string, $meta_value ); 746 break; 747 748 case 'BETWEEN': 749 case 'NOT BETWEEN': 750 $where = $wpdb->prepare( '%s AND %s', $meta_value[0], $meta_value[1] ); 751 break; 752 753 case 'LIKE': 754 case 'NOT LIKE': 755 $meta_value = '%' . $wpdb->esc_like( $meta_value ) . '%'; 756 $where = $wpdb->prepare( '%s', $meta_value ); 757 break; 758 759 // EXISTS with a value is interpreted as '='. 760 case 'EXISTS': 761 $meta_compare = '='; 762 $where = $wpdb->prepare( '%s', $meta_value ); 763 break; 764 765 // 'value' is ignored for NOT EXISTS. 766 case 'NOT EXISTS': 767 $where = ''; 768 break; 769 770 default: 771 $where = $wpdb->prepare( '%s', $meta_value ); 772 break; 773 774 } 775 776 if ( $where ) { 777 if ( 'CHAR' === $meta_type ) { 778 $sql_chunks['where'][] = "$alias.meta_value {$meta_compare} {$where}"; 779 } else { 780 $sql_chunks['where'][] = "CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$where}"; 781 } 782 } 783 } 784 785 /* 786 * Multiple WHERE clauses (for meta_key and meta_value) should 787 * be joined in parentheses. 788 */ 789 if ( 1 < count( $sql_chunks['where'] ) ) { 790 $sql_chunks['where'] = array( '( ' . implode( ' AND ', $sql_chunks['where'] ) . ' )' ); 791 } 792 793 return $sql_chunks; 794 } 795 796 /** 797 * Gets a flattened list of sanitized meta clauses. 798 * 799 * This array should be used for clause lookup, as when the table alias and CAST type must be determined for 800 * a value of 'orderby' corresponding to a meta clause. 801 * 802 * @since 4.2.0 803 * 804 * @return array Meta clauses. 805 */ 806 public function get_clauses() { 807 return $this->clauses; 808 } 809 810 /** 811 * Identifies an existing table alias that is compatible with the current 812 * query clause. 813 * 814 * We avoid unnecessary table joins by allowing each clause to look for 815 * an existing table alias that is compatible with the query that it 816 * needs to perform. 817 * 818 * An existing alias is compatible if (a) it is a sibling of `$clause` 819 * (ie, it's under the scope of the same relation), and (b) the combination 820 * of operator and relation between the clauses allows for a shared table join. 821 * In the case of WP_Meta_Query, this only applies to 'IN' clauses that are 822 * connected by the relation 'OR'. 823 * 824 * @since 4.1.0 825 * 826 * @param array $clause Query clause. 827 * @param array $parent_query Parent query of $clause. 828 * @return string|false Table alias if found, otherwise false. 829 */ 830 protected function find_compatible_table_alias( $clause, $parent_query ) { 831 $alias = false; 832 833 foreach ( $parent_query as $sibling ) { 834 // If the sibling has no alias yet, there's nothing to check. 835 if ( empty( $sibling['alias'] ) ) { 836 continue; 837 } 838 839 // We're only interested in siblings that are first-order clauses. 840 if ( ! is_array( $sibling ) || ! $this->is_first_order_clause( $sibling ) ) { 841 continue; 842 } 843 844 $compatible_compares = array(); 845 846 // Clauses connected by OR can share joins as long as they have "positive" operators. 847 if ( 'OR' === $parent_query['relation'] ) { 848 $compatible_compares = array( '=', 'IN', 'BETWEEN', 'LIKE', 'REGEXP', 'RLIKE', '>', '>=', '<', '<=' ); 849 850 // Clauses joined by AND with "negative" operators share a join only if they also share a key. 851 } elseif ( isset( $sibling['key'] ) && isset( $clause['key'] ) && $sibling['key'] === $clause['key'] ) { 852 $compatible_compares = array( '!=', 'NOT IN', 'NOT LIKE' ); 853 } 854 855 $clause_compare = strtoupper( $clause['compare'] ); 856 $sibling_compare = strtoupper( $sibling['compare'] ); 857 if ( in_array( $clause_compare, $compatible_compares, true ) && in_array( $sibling_compare, $compatible_compares, true ) ) { 858 $alias = preg_replace( '/\W/', '_', $sibling['alias'] ); 859 break; 860 } 861 } 862 863 /** 864 * Filters the table alias identified as compatible with the current clause. 865 * 866 * @since 4.1.0 867 * 868 * @param string|false $alias Table alias, or false if none was found. 869 * @param array $clause First-order query clause. 870 * @param array $parent_query Parent of $clause. 871 * @param WP_Meta_Query $query WP_Meta_Query object. 872 */ 873 return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ); 874 } 875 876 /** 877 * Checks whether the current query has any OR relations. 878 * 879 * In some cases, the presence of an OR relation somewhere in the query will require 880 * the use of a `DISTINCT` or `GROUP BY` keyword in the `SELECT` clause. The current 881 * method can be used in these cases to determine whether such a clause is necessary. 882 * 883 * @since 4.3.0 884 * 885 * @return bool True if the query contains any `OR` relations, otherwise false. 886 */ 887 public function has_or_relation() { 888 return $this->has_or_relation; 889 } 890 }
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