1 <?php

     2 /**

     3  * Taxonomy API: WP_Tax_Query class

     4  *

     5  * @package WordPress

     6  * @subpackage Taxonomy

     7  * @since 4.4.0

     8  */

     9 

    10 /**

    11  * Core class used to implement taxonomy queries for the Taxonomy API.

    12  *

    13  * Used for generating SQL clauses that filter a primary query according to object

    14  * taxonomy terms.

    15  *

    16  * WP_Tax_Query is a helper that allows primary query classes, such as WP_Query, to filter

    17  * their results by object metadata, by generating `JOIN` and `WHERE` subclauses to be

    18  * attached to the primary SQL query string.

    19  *

    20  * @since 3.1.0

    21  */

    22 class WP_Tax_Query {

    23 

    24 	/**

    25 	 * Array of taxonomy queries.

    26 	 *

    27 	 * See WP_Tax_Query::__construct() for information on tax query arguments.

    28 	 *

    29 	 * @since 3.1.0

    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 3.1.0

    38 	 * @var string

    39 	 */

    40 	public $relation;

    41 

    42 	/**

    43 	 * Standard response when the query should not return any rows.

    44 	 *

    45 	 * @since 3.2.0

    46 	 *

    47 	 * @static

    48 	 * @var string

    49 	 */

    50 	private static $no_results = array( 'join' => array( '' ), 'where' => array( '0 = 1' ) );

    51 

    52 	/**

    53 	 * A flat list of table aliases used in the JOIN clauses.

    54 	 *

    55 	 * @since 4.1.0

    56 	 * @var array

    57 	 */

    58 	protected $table_aliases = array();

    59 

    60 	/**

    61 	 * Terms and taxonomies fetched by this query.

    62 	 *

    63 	 * We store this data in a flat array because they are referenced in a

    64 	 * number of places by WP_Query.

    65 	 *

    66 	 * @since 4.1.0

    67 	 * @var array

    68 	 */

    69 	public $queried_terms = array();

    70 

    71 	/**

    72 	 * Database table that where the metadata's objects are stored (eg $wpdb->users).

    73 	 *

    74 	 * @since 4.1.0

    75 	 * @var string

    76 	 */

    77 	public $primary_table;

    78 

    79 	/**

    80 	 * Column in 'primary_table' that represents the ID of the object.

    81 	 *

    82 	 * @since 4.1.0

    83 	 * @var string

    84 	 */

    85 	public $primary_id_column;

    86 

    87 	/**

    88 	 * Constructor.

    89 	 *

    90 	 * @since 3.1.0

    91 	 * @since 4.1.0 Added support for `$operator` 'NOT EXISTS' and 'EXISTS' values.

    92 	 *

    93 	 * @param array $tax_query {

    94 	 *     Array of taxonomy query clauses.

    95 	 *

    96 	 *     @type string $relation Optional. The MySQL keyword used to join

    97 	 *                            the clauses of the query. Accepts 'AND', or 'OR'. Default 'AND'.

    98 	 *     @type array {

    99 	 *         Optional. An array of first-order clause parameters, or another fully-formed tax query.

   100 	 *

   101 	 *         @type string           $taxonomy         Taxonomy being queried. Optional when field=term_taxonomy_id.

   102 	 *         @type string|int|array $terms            Term or terms to filter by.

   103 	 *         @type string           $field            Field to match $terms against. Accepts 'term_id', 'slug',

   104 	 *                                                 'name', or 'term_taxonomy_id'. Default: 'term_id'.

   105 	 *         @type string           $operator         MySQL operator to be used with $terms in the WHERE clause.

   106 	 *                                                  Accepts 'AND', 'IN', 'NOT IN', 'EXISTS', 'NOT EXISTS'.

   107 	 *                                                  Default: 'IN'.

   108 	 *         @type bool             $include_children Optional. Whether to include child terms.

   109 	 *                                                  Requires a $taxonomy. Default: true.

   110 	 *     }

   111 	 * }

   112 	 */

   113 	public function __construct( $tax_query ) {

   114 		if ( isset( $tax_query['relation'] ) ) {

   115 			$this->relation = $this->sanitize_relation( $tax_query['relation'] );

   116 		} else {

   117 			$this->relation = 'AND';

   118 		}

   119 

   120 		$this->queries = $this->sanitize_query( $tax_query );

   121 	}

   122 

   123 	/**

   124 	 * Ensure the 'tax_query' argument passed to the class constructor is well-formed.

   125 	 *

   126 	 * Ensures that each query-level clause has a 'relation' key, and that

   127 	 * each first-order clause contains all the necessary keys from `$defaults`.

   128 	 *

   129 	 * @since 4.1.0

   130 	 *

   131 	 * @param array $queries Array of queries clauses.

   132 	 * @return array Sanitized array of query clauses.

   133 	 */

   134 	public function sanitize_query( $queries ) {

   135 		$cleaned_query = array();

   136 

   137 		$defaults = array(

   138 			'taxonomy' => '',

   139 			'terms' => array(),

   140 			'field' => 'term_id',

   141 			'operator' => 'IN',

   142 			'include_children' => true,

   143 		);

   144 

   145 		foreach ( $queries as $key => $query ) {

   146 			if ( 'relation' === $key ) {

   147 				$cleaned_query['relation'] = $this->sanitize_relation( $query );

   148 

   149 			// First-order clause.

   150 			} elseif ( self::is_first_order_clause( $query ) ) {

   151 

   152 				$cleaned_clause = array_merge( $defaults, $query );

   153 				$cleaned_clause['terms'] = (array) $cleaned_clause['terms'];

   154 				$cleaned_query[] = $cleaned_clause;

   155 

   156 				/*

   157 				 * Keep a copy of the clause in the flate

   158 				 * $queried_terms array, for use in WP_Query.

   159 				 */

   160 				if ( ! empty( $cleaned_clause['taxonomy'] ) && 'NOT IN' !== $cleaned_clause['operator'] ) {

   161 					$taxonomy = $cleaned_clause['taxonomy'];

   162 					if ( ! isset( $this->queried_terms[ $taxonomy ] ) ) {

   163 						$this->queried_terms[ $taxonomy ] = array();

   164 					}

   165 

   166 					/*

   167 					 * Backward compatibility: Only store the first

   168 					 * 'terms' and 'field' found for a given taxonomy.

   169 					 */

   170 					if ( ! empty( $cleaned_clause['terms'] ) && ! isset( $this->queried_terms[ $taxonomy ]['terms'] ) ) {

   171 						$this->queried_terms[ $taxonomy ]['terms'] = $cleaned_clause['terms'];

   172 					}

   173 

   174 					if ( ! empty( $cleaned_clause['field'] ) && ! isset( $this->queried_terms[ $taxonomy ]['field'] ) ) {

   175 						$this->queried_terms[ $taxonomy ]['field'] = $cleaned_clause['field'];

   176 					}

   177 				}

   178 

   179 			// Otherwise, it's a nested query, so we recurse.

   180 			} elseif ( is_array( $query ) ) {

   181 				$cleaned_subquery = $this->sanitize_query( $query );

   182 

   183 				if ( ! empty( $cleaned_subquery ) ) {

   184 					// All queries with children must have a relation.

   185 					if ( ! isset( $cleaned_subquery['relation'] ) ) {

   186 						$cleaned_subquery['relation'] = 'AND';

   187 					}

   188 

   189 					$cleaned_query[] = $cleaned_subquery;

   190 				}

   191 			}

   192 		}

   193 

   194 		return $cleaned_query;

   195 	}

   196 

   197 	/**

   198 	 * Sanitize a 'relation' operator.

   199 	 *

   200 	 * @since 4.1.0

   201 	 *

   202 	 * @param string $relation Raw relation key from the query argument.

   203 	 * @return string Sanitized relation ('AND' or 'OR').

   204 	 */

   205 	public function sanitize_relation( $relation ) {

   206 		if ( 'OR' === strtoupper( $relation ) ) {

   207 			return 'OR';

   208 		} else {

   209 			return 'AND';

   210 		}

   211 	}

   212 

   213 	/**

   214 	 * Determine whether a clause is first-order.

   215 	 *

   216 	 * A "first-order" clause is one that contains any of the first-order

   217 	 * clause keys ('terms', 'taxonomy', 'include_children', 'field',

   218 	 * 'operator'). An empty clause also counts as a first-order clause,

   219 	 * for backward compatibility. Any clause that doesn't meet this is

   220 	 * determined, by process of elimination, to be a higher-order query.

   221 	 *

   222 	 * @since 4.1.0

   223 	 *

   224 	 * @static

   225 	 *

   226 	 * @param array $query Tax query arguments.

   227 	 * @return bool Whether the query clause is a first-order clause.

   228 	 */

   229 	protected static function is_first_order_clause( $query ) {

   230 		return is_array( $query ) && ( empty( $query ) || array_key_exists( 'terms', $query ) || array_key_exists( 'taxonomy', $query ) || array_key_exists( 'include_children', $query ) || array_key_exists( 'field', $query ) || array_key_exists( 'operator', $query ) );

   231 	}

   232 

   233 	/**

   234 	 * Generates SQL clauses to be appended to a main query.

   235 	 *

   236 	 * @since 3.1.0

   237 	 *

   238 	 * @static

   239 	 *

   240 	 * @param string $primary_table     Database table where the object being filtered is stored (eg wp_users).

   241 	 * @param string $primary_id_column ID column for the filtered object in $primary_table.

   242 	 * @return array {

   243 	 *     Array containing JOIN and WHERE SQL clauses to append to the main query.

   244 	 *

   245 	 *     @type string $join  SQL fragment to append to the main JOIN clause.

   246 	 *     @type string $where SQL fragment to append to the main WHERE clause.

   247 	 * }

   248 	 */

   249 	public function get_sql( $primary_table, $primary_id_column ) {

   250 		$this->primary_table = $primary_table;

   251 		$this->primary_id_column = $primary_id_column;

   252 

   253 		return $this->get_sql_clauses();

   254 	}

   255 

   256 	/**

   257 	 * Generate SQL clauses to be appended to a main query.

   258 	 *

   259 	 * Called by the public WP_Tax_Query::get_sql(), this method

   260 	 * is abstracted out to maintain parity with the other Query classes.

   261 	 *

   262 	 * @since 4.1.0

   263 	 *

   264 	 * @return array {

   265 	 *     Array containing JOIN and WHERE SQL clauses to append to the main query.

   266 	 *

   267 	 *     @type string $join  SQL fragment to append to the main JOIN clause.

   268 	 *     @type string $where SQL fragment to append to the main WHERE clause.

   269 	 * }

   270 	 */

   271 	protected function get_sql_clauses() {

   272 		/*

   273 		 * $queries are passed by reference to get_sql_for_query() for recursion.

   274 		 * To keep $this->queries unaltered, pass a copy.

   275 		 */

   276 		$queries = $this->queries;

   277 		$sql = $this->get_sql_for_query( $queries );

   278 

   279 		if ( ! empty( $sql['where'] ) ) {

   280 			$sql['where'] = ' AND ' . $sql['where'];

   281 		}

   282 

   283 		return $sql;

   284 	}

   285 

   286 	/**

   287 	 * Generate SQL clauses for a single query array.

   288 	 *

   289 	 * If nested subqueries are found, this method recurses the tree to

   290 	 * produce the properly nested SQL.

   291 	 *

   292 	 * @since 4.1.0

   293 	 *

   294 	 * @param array $query Query to parse (passed by reference).

   295 	 * @param int   $depth Optional. Number of tree levels deep we currently are.

   296 	 *                     Used to calculate indentation. Default 0.

   297 	 * @return array {

   298 	 *     Array containing JOIN and WHERE SQL clauses to append to a single query array.

   299 	 *

   300 	 *     @type string $join  SQL fragment to append to the main JOIN clause.

   301 	 *     @type string $where SQL fragment to append to the main WHERE clause.

   302 	 * }

   303 	 */

   304 	protected function get_sql_for_query( &$query, $depth = 0 ) {

   305 		$sql_chunks = array(

   306 			'join'  => array(),

   307 			'where' => array(),

   308 		);

   309 

   310 		$sql = array(

   311 			'join'  => '',

   312 			'where' => '',

   313 		);

   314 

   315 		$indent = '';

   316 		for ( $i = 0; $i < $depth; $i++ ) {

   317 			$indent .= "  ";

   318 		}

   319 

   320 		foreach ( $query as $key => &$clause ) {

   321 			if ( 'relation' === $key ) {

   322 				$relation = $query['relation'];

   323 			} elseif ( is_array( $clause ) ) {

   324 

   325 				// This is a first-order clause.

   326 				if ( $this->is_first_order_clause( $clause ) ) {

   327 					$clause_sql = $this->get_sql_for_clause( $clause, $query );

   328 

   329 					$where_count = count( $clause_sql['where'] );

   330 					if ( ! $where_count ) {

   331 						$sql_chunks['where'][] = '';

   332 					} elseif ( 1 === $where_count ) {

   333 						$sql_chunks['where'][] = $clause_sql['where'][0];

   334 					} else {

   335 						$sql_chunks['where'][] = '( ' . implode( ' AND ', $clause_sql['where'] ) . ' )';

   336 					}

   337 

   338 					$sql_chunks['join'] = array_merge( $sql_chunks['join'], $clause_sql['join'] );

   339 				// This is a subquery, so we recurse.

   340 				} else {

   341 					$clause_sql = $this->get_sql_for_query( $clause, $depth + 1 );

   342 

   343 					$sql_chunks['where'][] = $clause_sql['where'];

   344 					$sql_chunks['join'][]  = $clause_sql['join'];

   345 				}

   346 			}

   347 		}

   348 

   349 		// Filter to remove empties.

   350 		$sql_chunks['join']  = array_filter( $sql_chunks['join'] );

   351 		$sql_chunks['where'] = array_filter( $sql_chunks['where'] );

   352 

   353 		if ( empty( $relation ) ) {

   354 			$relation = 'AND';

   355 		}

   356 

   357 		// Filter duplicate JOIN clauses and combine into a single string.

   358 		if ( ! empty( $sql_chunks['join'] ) ) {

   359 			$sql['join'] = implode( ' ', array_unique( $sql_chunks['join'] ) );

   360 		}

   361 

   362 		// Generate a single WHERE clause with proper brackets and indentation.

   363 		if ( ! empty( $sql_chunks['where'] ) ) {

   364 			$sql['where'] = '( ' . "\n  " . $indent . implode( ' ' . "\n  " . $indent . $relation . ' ' . "\n  " . $indent, $sql_chunks['where'] ) . "\n" . $indent . ')';

   365 		}

   366 

   367 		return $sql;

   368 	}

   369 

   370 	/**

   371 	 * Generate SQL JOIN and WHERE clauses for a "first-order" query clause.

   372 	 *

   373 	 * @since 4.1.0

   374 	 *

   375 	 * @global wpdb $wpdb The WordPress database abstraction object.

   376 	 *

   377 	 * @param array $clause       Query clause (passed by reference).

   378 	 * @param array $parent_query Parent query array.

   379 	 * @return array {

   380 	 *     Array containing JOIN and WHERE SQL clauses to append to a first-order query.

   381 	 *

   382 	 *     @type string $join  SQL fragment to append to the main JOIN clause.

   383 	 *     @type string $where SQL fragment to append to the main WHERE clause.

   384 	 * }

   385 	 */

   386 	public function get_sql_for_clause( &$clause, $parent_query ) {

   387 		global $wpdb;

   388 

   389 		$sql = array(

   390 			'where' => array(),

   391 			'join'  => array(),

   392 		);

   393 

   394 		$join = $where = '';

   395 

   396 		$this->clean_query( $clause );

   397 

   398 		if ( is_wp_error( $clause ) ) {

   399 			return self::$no_results;

   400 		}

   401 

   402 		$terms = $clause['terms'];

   403 		$operator = strtoupper( $clause['operator'] );

   404 

   405 		if ( 'IN' == $operator ) {

   406 

   407 			if ( empty( $terms ) ) {

   408 				return self::$no_results;

   409 			}

   410 

   411 			$terms = implode( ',', $terms );

   412 

   413 			/*

   414 			 * Before creating another table join, see if this clause has a

   415 			 * sibling with an existing join that can be shared.

   416 			 */

   417 			$alias = $this->find_compatible_table_alias( $clause, $parent_query );

   418 			if ( false === $alias ) {

   419 				$i = count( $this->table_aliases );

   420 				$alias = $i ? 'tt' . $i : $wpdb->term_relationships;

   421 

   422 				// Store the alias as part of a flat array to build future iterators.

   423 				$this->table_aliases[] = $alias;

   424 

   425 				// Store the alias with this clause, so later siblings can use it.

   426 				$clause['alias'] = $alias;

   427 

   428 				$join .= " LEFT JOIN $wpdb->term_relationships";

   429 				$join .= $i ? " AS $alias" : '';

   430 				$join .= " ON ($this->primary_table.$this->primary_id_column = $alias.object_id)";

   431 			}

   432 

   433 

   434 			$where = "$alias.term_taxonomy_id $operator ($terms)";

   435 

   436 		} elseif ( 'NOT IN' == $operator ) {

   437 

   438 			if ( empty( $terms ) ) {

   439 				return $sql;

   440 			}

   441 

   442 			$terms = implode( ',', $terms );

   443 

   444 			$where = "$this->primary_table.$this->primary_id_column NOT IN (

   445 				SELECT object_id

   446 				FROM $wpdb->term_relationships

   447 				WHERE term_taxonomy_id IN ($terms)

   448 			)";

   449 

   450 		} elseif ( 'AND' == $operator ) {

   451 

   452 			if ( empty( $terms ) ) {

   453 				return $sql;

   454 			}

   455 

   456 			$num_terms = count( $terms );

   457 

   458 			$terms = implode( ',', $terms );

   459 

   460 			$where = "(

   461 				SELECT COUNT(1)

   462 				FROM $wpdb->term_relationships

   463 				WHERE term_taxonomy_id IN ($terms)

   464 				AND object_id = $this->primary_table.$this->primary_id_column

   465 			) = $num_terms";

   466 

   467 		} elseif ( 'NOT EXISTS' === $operator || 'EXISTS' === $operator ) {

   468 

   469 			$where = $wpdb->prepare( "$operator (

   470 				SELECT 1

   471 				FROM $wpdb->term_relationships

   472 				INNER JOIN $wpdb->term_taxonomy

   473 				ON $wpdb->term_taxonomy.term_taxonomy_id = $wpdb->term_relationships.term_taxonomy_id

   474 				WHERE $wpdb->term_taxonomy.taxonomy = %s

   475 				AND $wpdb->term_relationships.object_id = $this->primary_table.$this->primary_id_column

   476 			)", $clause['taxonomy'] );

   477 

   478 		}

   479 

   480 		$sql['join'][]  = $join;

   481 		$sql['where'][] = $where;

   482 		return $sql;

   483 	}

   484 

   485 	/**

   486 	 * Identify an existing table alias that is compatible with the current query clause.

   487 	 *

   488 	 * We avoid unnecessary table joins by allowing each clause to look for

   489 	 * an existing table alias that is compatible with the query that it

   490 	 * needs to perform.

   491 	 *

   492 	 * An existing alias is compatible if (a) it is a sibling of `$clause`

   493 	 * (ie, it's under the scope of the same relation), and (b) the combination

   494 	 * of operator and relation between the clauses allows for a shared table

   495 	 * join. In the case of WP_Tax_Query, this only applies to 'IN'

   496 	 * clauses that are connected by the relation 'OR'.

   497 	 *

   498 	 * @since 4.1.0

   499 	 *

   500 	 * @param array       $clause       Query clause.

   501 	 * @param array       $parent_query Parent query of $clause.

   502 	 * @return string|false Table alias if found, otherwise false.

   503 	 */

   504 	protected function find_compatible_table_alias( $clause, $parent_query ) {

   505 		$alias = false;

   506 

   507 		// Sanity check. Only IN queries use the JOIN syntax .

   508 		if ( ! isset( $clause['operator'] ) || 'IN' !== $clause['operator'] ) {

   509 			return $alias;

   510 		}

   511 

   512 		// Since we're only checking IN queries, we're only concerned with OR relations.

   513 		if ( ! isset( $parent_query['relation'] ) || 'OR' !== $parent_query['relation'] ) {

   514 			return $alias;

   515 		}

   516 

   517 		$compatible_operators = array( 'IN' );

   518 

   519 		foreach ( $parent_query as $sibling ) {

   520 			if ( ! is_array( $sibling ) || ! $this->is_first_order_clause( $sibling ) ) {

   521 				continue;

   522 			}

   523 

   524 			if ( empty( $sibling['alias'] ) || empty( $sibling['operator'] ) ) {

   525 				continue;

   526 			}

   527 

   528 			// The sibling must both have compatible operator to share its alias.

   529 			if ( in_array( strtoupper( $sibling['operator'] ), $compatible_operators ) ) {

   530 				$alias = $sibling['alias'];

   531 				break;

   532 			}

   533 		}

   534 

   535 		return $alias;

   536 	}

   537 

   538 	/**

   539 	 * Validates a single query.

   540 	 *

   541 	 * @since 3.2.0

   542 	 *

   543 	 * @param array $query The single query. Passed by reference.

   544 	 */

   545 	private function clean_query( &$query ) {

   546 		if ( empty( $query['taxonomy'] ) ) {

   547 			if ( 'term_taxonomy_id' !== $query['field'] ) {

   548 				$query = new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );

   549 				return;

   550 			}

   551 

   552 			// so long as there are shared terms, include_children requires that a taxonomy is set

   553 			$query['include_children'] = false;

   554 		} elseif ( ! taxonomy_exists( $query['taxonomy'] ) ) {

   555 			$query = new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );

   556 			return;

   557 		}

   558 

   559 		$query['terms'] = array_unique( (array) $query['terms'] );

   560 

   561 		if ( is_taxonomy_hierarchical( $query['taxonomy'] ) && $query['include_children'] ) {

   562 			$this->transform_query( $query, 'term_id' );

   563 

   564 			if ( is_wp_error( $query ) )

   565 				return;

   566 

   567 			$children = array();

   568 			foreach ( $query['terms'] as $term ) {

   569 				$children = array_merge( $children, get_term_children( $term, $query['taxonomy'] ) );

   570 				$children[] = $term;

   571 			}

   572 			$query['terms'] = $children;

   573 		}

   574 

   575 		$this->transform_query( $query, 'term_taxonomy_id' );

   576 	}

   577 

   578 	/**

   579 	 * Transforms a single query, from one field to another.

   580 	 *

   581 	 * Operates on the `$query` object by reference. In the case of error,

   582 	 * `$query` is converted to a WP_Error object.

   583 	 *

   584 	 * @since 3.2.0

   585 	 *

   586 	 * @global wpdb $wpdb The WordPress database abstraction object.

   587 	 *

   588 	 * @param array  $query           The single query. Passed by reference.

   589 	 * @param string $resulting_field The resulting field. Accepts 'slug', 'name', 'term_taxonomy_id',

   590 	 *                                or 'term_id'. Default 'term_id'.

   591 	 */

   592 	public function transform_query( &$query, $resulting_field ) {

   593 		if ( empty( $query['terms'] ) )

   594 			return;

   595 

   596 		if ( $query['field'] == $resulting_field )

   597 			return;

   598 

   599 		$resulting_field = sanitize_key( $resulting_field );

   600 

   601 		// Empty 'terms' always results in a null transformation.

   602 		$terms = array_filter( $query['terms'] );

   603 		if ( empty( $terms ) ) {

   604 			$query['terms'] = array();

   605 			$query['field'] = $resulting_field;

   606 			return;

   607 		}

   608 

   609 		$args = array(

   610 			'get'                    => 'all',

   611 			'number'                 => 0,

   612 			'taxonomy'               => $query['taxonomy'],

   613 			'update_term_meta_cache' => false,

   614 			'orderby'                => 'none',

   615 		);

   616 

   617 		// Term query parameter name depends on the 'field' being searched on.

   618 		switch ( $query['field'] ) {

   619 			case 'slug':

   620 				$args['slug'] = $terms;

   621 				break;

   622 			case 'name':

   623 				$args['name'] = $terms;

   624 				break;

   625 			case 'term_taxonomy_id':

   626 				$args['term_taxonomy_id'] = $terms;

   627 				break;

   628 			default:

   629 				$args['include'] = wp_parse_id_list( $terms );

   630 				break;

   631 		}

   632 

   633 		$term_query = new WP_Term_Query();

   634 		$term_list  = $term_query->query( $args );

   635 

   636 		if ( is_wp_error( $term_list ) ) {

   637 			$query = $term_list;

   638 			return;

   639 		}

   640 

   641 		if ( 'AND' == $query['operator'] && count( $term_list ) < count( $query['terms'] ) ) {

   642 			$query = new WP_Error( 'inexistent_terms', __( 'Inexistent terms.' ) );

   643 			return;

   644 		}

   645 

   646 		$query['terms'] = wp_list_pluck( $term_list, $resulting_field );

   647 		$query['field'] = $resulting_field;

   648 	}

   649 }