?<h3>D¨ızenle: class-wp-tax-query.php</h3>
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/**
 * Taxonomy API: WP_Tax_Query class
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 4.4.0
 */

/**
 * Core class used to implement taxonomy queries for the Taxonomy API.
 *
 * Used for generating SQL clauses that filter a primary query according to object
 * taxonomy terms.
 *
 * WP_Tax_Query is a helper that allows primary query classes, such as WP_Query, to filter
 * their results by object metadata, by generating `JOIN` and `WHERE` subclauses to be
 * attached to the primary SQL query string.
 *
 * @since 3.1.0
 */
#[AllowDynamicProperties]
class WP_Tax_Query {

	/**
	 * Array of taxonomy queries.
	 *
	 * See WP_Tax_Query::__construct() for information on tax query arguments.
	 *
	 * @since 3.1.0
	 * @var array
	 */
	public $queries = array();

	/**
	 * The relation between the queries. Can be one of &#039;AND&#039; or &#039;OR&#039;.
	 *
	 * @since 3.1.0
	 * @var string
	 */
	public $relation;

	/**
	 * Standard response when the query should not return any rows.
	 *
	 * @since 3.2.0
	 * @var string
	 */
	private static $no_results = array(
		&#039;join&#039;  =&gt; array( &#039;&#039; ),
		&#039;where&#039; =&gt; array( &#039;0 = 1&#039; ),
	);

	/**
	 * A flat list of table aliases used in the JOIN clauses.
	 *
	 * @since 4.1.0
	 * @var array
	 */
	protected $table_aliases = array();

	/**
	 * Terms and taxonomies fetched by this query.
	 *
	 * We store this data in a flat array because they are referenced in a
	 * number of places by WP_Query.
	 *
	 * @since 4.1.0
	 * @var array
	 */
	public $queried_terms = array();

	/**
	 * Database table that where the metadata&#039;s objects are stored (eg $wpdb-&gt;users).
	 *
	 * @since 4.1.0
	 * @var string
	 */
	public $primary_table;

	/**
	 * Column in &#039;primary_table&#039; that represents the ID of the object.
	 *
	 * @since 4.1.0
	 * @var string
	 */
	public $primary_id_column;

	/**
	 * Constructor.
	 *
	 * @since 3.1.0
	 * @since 4.1.0 Added support for `$operator` &#039;NOT EXISTS&#039; and &#039;EXISTS&#039; values.
	 *
	 * @param array $tax_query {
	 *     Array of taxonomy query clauses.
	 *
	 *     @type string $relation Optional. The MySQL keyword used to join
	 *                            the clauses of the query. Accepts &#039;AND&#039;, or &#039;OR&#039;. Default &#039;AND&#039;.
	 *     @type array  ...$0 {
	 *         An array of first-order clause parameters, or another fully-formed tax query.
	 *
	 *         @type string           $taxonomy         Taxonomy being queried. Optional when field=term_taxonomy_id.
	 *         @type string|int|array $terms            Term or terms to filter by.
	 *         @type string           $field            Field to match $terms against. Accepts &#039;term_id&#039;, &#039;slug&#039;,
	 *                                                 &#039;name&#039;, or &#039;term_taxonomy_id&#039;. Default: &#039;term_id&#039;.
	 *         @type string           $operator         MySQL operator to be used with $terms in the WHERE clause.
	 *                                                  Accepts &#039;AND&#039;, &#039;IN&#039;, &#039;NOT IN&#039;, &#039;EXISTS&#039;, &#039;NOT EXISTS&#039;.
	 *                                                  Default: &#039;IN&#039;.
	 *         @type bool             $include_children Optional. Whether to include child terms.
	 *                                                  Requires a $taxonomy. Default: true.
	 *     }
	 * }
	 */
	public function __construct( $tax_query ) {
		if ( isset( $tax_query[&#039;relation&#039;] ) ) {
			$this-&gt;relation = $this-&gt;sanitize_relation( $tax_query[&#039;relation&#039;] );
		} else {
			$this-&gt;relation = &#039;AND&#039;;
		}

		$this-&gt;queries = $this-&gt;sanitize_query( $tax_query );
	}

	/**
	 * Ensures the &#039;tax_query&#039; argument passed to the class constructor is well-formed.
	 *
	 * Ensures that each query-level clause has a &#039;relation&#039; key, and that
	 * each first-order clause contains all the necessary keys from `$defaults`.
	 *
	 * @since 4.1.0
	 *
	 * @param array $queries Array of queries clauses.
	 * @return array Sanitized array of query clauses.
	 */
	public function sanitize_query( $queries ) {
		$cleaned_query = array();

		$defaults = array(
			&#039;taxonomy&#039;         =&gt; &#039;&#039;,
			&#039;terms&#039;            =&gt; array(),
			&#039;field&#039;            =&gt; &#039;term_id&#039;,
			&#039;operator&#039;         =&gt; &#039;IN&#039;,
			&#039;include_children&#039; =&gt; true,
		);

		foreach ( $queries as $key =&gt; $query ) {
			if ( &#039;relation&#039; === $key ) {
				$cleaned_query[&#039;relation&#039;] = $this-&gt;sanitize_relation( $query );

				// First-order clause.
			} elseif ( self::is_first_order_clause( $query ) ) {

				$cleaned_clause          = array_merge( $defaults, $query );
				$cleaned_clause[&#039;terms&#039;] = (array) $cleaned_clause[&#039;terms&#039;];
				$cleaned_query[]         = $cleaned_clause;

				/*
				 * Keep a copy of the clause in the flate
				 * $queried_terms array, for use in WP_Query.
				 */
				if ( ! empty( $cleaned_clause[&#039;taxonomy&#039;] ) &amp;&amp; &#039;NOT IN&#039; !== $cleaned_clause[&#039;operator&#039;] ) {
					$taxonomy = $cleaned_clause[&#039;taxonomy&#039;];
					if ( ! isset( $this-&gt;queried_terms[ $taxonomy ] ) ) {
						$this-&gt;queried_terms[ $taxonomy ] = array();
					}

					/*
					 * Backward compatibility: Only store the first
					 * &#039;terms&#039; and &#039;field&#039; found for a given taxonomy.
					 */
					if ( ! empty( $cleaned_clause[&#039;terms&#039;] ) &amp;&amp; ! isset( $this-&gt;queried_terms[ $taxonomy ][&#039;terms&#039;] ) ) {
						$this-&gt;queried_terms[ $taxonomy ][&#039;terms&#039;] = $cleaned_clause[&#039;terms&#039;];
					}

					if ( ! empty( $cleaned_clause[&#039;field&#039;] ) &amp;&amp; ! isset( $this-&gt;queried_terms[ $taxonomy ][&#039;field&#039;] ) ) {
						$this-&gt;queried_terms[ $taxonomy ][&#039;field&#039;] = $cleaned_clause[&#039;field&#039;];
					}
				}

				// Otherwise, it&#039;s a nested query, so we recurse.
			} elseif ( is_array( $query ) ) {
				$cleaned_subquery = $this-&gt;sanitize_query( $query );

				if ( ! empty( $cleaned_subquery ) ) {
					// All queries with children must have a relation.
					if ( ! isset( $cleaned_subquery[&#039;relation&#039;] ) ) {
						$cleaned_subquery[&#039;relation&#039;] = &#039;AND&#039;;
					}

					$cleaned_query[] = $cleaned_subquery;
				}
			}
		}

		return $cleaned_query;
	}

	/**
	 * Sanitizes a &#039;relation&#039; operator.
	 *
	 * @since 4.1.0
	 *
	 * @param string $relation Raw relation key from the query argument.
	 * @return string Sanitized relation. Either &#039;AND&#039; or &#039;OR&#039;.
	 */
	public function sanitize_relation( $relation ) {
		if ( &#039;OR&#039; === strtoupper( $relation ) ) {
			return &#039;OR&#039;;
		} else {
			return &#039;AND&#039;;
		}
	}

	/**
	 * Determines whether a clause is first-order.
	 *
	 * A &quot;first-order&quot; clause is one that contains any of the first-order
	 * clause keys (&#039;terms&#039;, &#039;taxonomy&#039;, &#039;include_children&#039;, &#039;field&#039;,
	 * &#039;operator&#039;). An empty clause also counts as a first-order clause,
	 * for backward compatibility. Any clause that doesn&#039;t meet this is
	 * determined, by process of elimination, to be a higher-order query.
	 *
	 * @since 4.1.0
	 *
	 * @param array $query Tax query arguments.
	 * @return bool Whether the query clause is a first-order clause.
	 */
	protected static function is_first_order_clause( $query ) {
		return is_array( $query ) &amp;&amp; ( empty( $query ) || array_key_exists( &#039;terms&#039;, $query ) || array_key_exists( &#039;taxonomy&#039;, $query ) || array_key_exists( &#039;include_children&#039;, $query ) || array_key_exists( &#039;field&#039;, $query ) || array_key_exists( &#039;operator&#039;, $query ) );
	}

	/**
	 * Generates SQL clauses to be appended to a main query.
	 *
	 * @since 3.1.0
	 *
	 * @param string $primary_table     Database table where the object being filtered is stored (eg wp_users).
	 * @param string $primary_id_column ID column for the filtered object in $primary_table.
	 * @return string[] {
	 *     Array containing JOIN and WHERE SQL clauses to append to the main query.
	 *
	 *     @type string $join  SQL fragment to append to the main JOIN clause.
	 *     @type string $where SQL fragment to append to the main WHERE clause.
	 * }
	 */
	public function get_sql( $primary_table, $primary_id_column ) {
		$this-&gt;primary_table     = $primary_table;
		$this-&gt;primary_id_column = $primary_id_column;

		return $this-&gt;get_sql_clauses();
	}

	/**
	 * Generates SQL clauses to be appended to a main query.
	 *
	 * Called by the public WP_Tax_Query::get_sql(), this method
	 * is abstracted out to maintain parity with the other Query classes.
	 *
	 * @since 4.1.0
	 *
	 * @return string[] {
	 *     Array containing JOIN and WHERE SQL clauses to append to the main query.
	 *
	 *     @type string $join  SQL fragment to append to the main JOIN clause.
	 *     @type string $where SQL fragment to append to the main WHERE clause.
	 * }
	 */
	protected function get_sql_clauses() {
		/*
		 * $queries are passed by reference to get_sql_for_query() for recursion.
		 * To keep $this-&gt;queries unaltered, pass a copy.
		 */
		$queries = $this-&gt;queries;
		$sql     = $this-&gt;get_sql_for_query( $queries );

		if ( ! empty( $sql[&#039;where&#039;] ) ) {
			$sql[&#039;where&#039;] = &#039; AND &#039; . $sql[&#039;where&#039;];
		}

		return $sql;
	}

	/**
	 * Generates SQL clauses for a single query array.
	 *
	 * If nested subqueries are found, this method recurses the tree to
	 * produce the properly nested SQL.
	 *
	 * @since 4.1.0
	 *
	 * @param array $query Query to parse (passed by reference).
	 * @param int   $depth Optional. Number of tree levels deep we currently are.
	 *                     Used to calculate indentation. Default 0.
	 * @return string[] {
	 *     Array containing JOIN and WHERE SQL clauses to append to a single query array.
	 *
	 *     @type string $join  SQL fragment to append to the main JOIN clause.
	 *     @type string $where SQL fragment to append to the main WHERE clause.
	 * }
	 */
	protected function get_sql_for_query( &amp;$query, $depth = 0 ) {
		$sql_chunks = array(
			&#039;join&#039;  =&gt; array(),
			&#039;where&#039; =&gt; array(),
		);

		$sql = array(
			&#039;join&#039;  =&gt; &#039;&#039;,
			&#039;where&#039; =&gt; &#039;&#039;,
		);

		$indent = &#039;&#039;;
		for ( $i = 0; $i &lt; $depth; $i++ ) {
			$indent .= &#039;  &#039;;
		}

		foreach ( $query as $key =&gt; &amp;$clause ) {
			if ( &#039;relation&#039; === $key ) {
				$relation = $query[&#039;relation&#039;];
			} elseif ( is_array( $clause ) ) {

				// This is a first-order clause.
				if ( $this-&gt;is_first_order_clause( $clause ) ) {
					$clause_sql = $this-&gt;get_sql_for_clause( $clause, $query );

					$where_count = count( $clause_sql[&#039;where&#039;] );
					if ( ! $where_count ) {
						$sql_chunks[&#039;where&#039;][] = &#039;&#039;;
					} elseif ( 1 === $where_count ) {
						$sql_chunks[&#039;where&#039;][] = $clause_sql[&#039;where&#039;][0];
					} else {
						$sql_chunks[&#039;where&#039;][] = &#039;( &#039; . implode( &#039; AND &#039;, $clause_sql[&#039;where&#039;] ) . &#039; )&#039;;
					}

					$sql_chunks[&#039;join&#039;] = array_merge( $sql_chunks[&#039;join&#039;], $clause_sql[&#039;join&#039;] );
					// This is a subquery, so we recurse.
				} else {
					$clause_sql = $this-&gt;get_sql_for_query( $clause, $depth + 1 );

					$sql_chunks[&#039;where&#039;][] = $clause_sql[&#039;where&#039;];
					$sql_chunks[&#039;join&#039;][]  = $clause_sql[&#039;join&#039;];
				}
			}
		}

		// Filter to remove empties.
		$sql_chunks[&#039;join&#039;]  = array_filter( $sql_chunks[&#039;join&#039;] );
		$sql_chunks[&#039;where&#039;] = array_filter( $sql_chunks[&#039;where&#039;] );

		if ( empty( $relation ) ) {
			$relation = &#039;AND&#039;;
		}

		// Filter duplicate JOIN clauses and combine into a single string.
		if ( ! empty( $sql_chunks[&#039;join&#039;] ) ) {
			$sql[&#039;join&#039;] = implode( &#039; &#039;, array_unique( $sql_chunks[&#039;join&#039;] ) );
		}

		// Generate a single WHERE clause with proper brackets and indentation.
		if ( ! empty( $sql_chunks[&#039;where&#039;] ) ) {
			$sql[&#039;where&#039;] = &#039;( &#039; . &quot;\n  &quot; . $indent . implode( &#039; &#039; . &quot;\n  &quot; . $indent . $relation . &#039; &#039; . &quot;\n  &quot; . $indent, $sql_chunks[&#039;where&#039;] ) . &quot;\n&quot; . $indent . &#039;)&#039;;
		}

		return $sql;
	}

	/**
	 * Generates SQL JOIN and WHERE clauses for a &quot;first-order&quot; query clause.
	 *
	 * @since 4.1.0
	 *
	 * @global wpdb $wpdb The WordPress database abstraction object.
	 *
	 * @param array $clause       Query clause (passed by reference).
	 * @param array $parent_query Parent query array.
	 * @return array {
	 *     Array containing JOIN and WHERE SQL clauses to append to a first-order query.
	 *
	 *     @type string[] $join  Array of SQL fragments to append to the main JOIN clause.
	 *     @type string[] $where Array of SQL fragments to append to the main WHERE clause.
	 * }
	 */
	public function get_sql_for_clause( &amp;$clause, $parent_query ) {
		global $wpdb;

		$sql = array(
			&#039;where&#039; =&gt; array(),
			&#039;join&#039;  =&gt; array(),
		);

		$join  = &#039;&#039;;
		$where = &#039;&#039;;

		$this-&gt;clean_query( $clause );

		if ( is_wp_error( $clause ) ) {
			return self::$no_results;
		}

		$terms    = $clause[&#039;terms&#039;];
		$operator = strtoupper( $clause[&#039;operator&#039;] );

		if ( &#039;IN&#039; === $operator ) {

			if ( empty( $terms ) ) {
				return self::$no_results;
			}

			$terms = implode( &#039;,&#039;, $terms );

			/*
			 * Before creating another table join, see if this clause has a
			 * sibling with an existing join that can be shared.
			 */
			$alias = $this-&gt;find_compatible_table_alias( $clause, $parent_query );
			if ( false === $alias ) {
				$i     = count( $this-&gt;table_aliases );
				$alias = $i ? &#039;tt&#039; . $i : $wpdb-&gt;term_relationships;

				// Store the alias as part of a flat array to build future iterators.
				$this-&gt;table_aliases[] = $alias;

				// Store the alias with this clause, so later siblings can use it.
				$clause[&#039;alias&#039;] = $alias;

				$join .= &quot; LEFT JOIN $wpdb-&gt;term_relationships&quot;;
				$join .= $i ? &quot; AS $alias&quot; : &#039;&#039;;
				$join .= &quot; ON ($this-&gt;primary_table.$this-&gt;primary_id_column = $alias.object_id)&quot;;
			}

			$where = &quot;$alias.term_taxonomy_id $operator ($terms)&quot;;

		} elseif ( &#039;NOT IN&#039; === $operator ) {

			if ( empty( $terms ) ) {
				return $sql;
			}

			$terms = implode( &#039;,&#039;, $terms );

			$where = &quot;$this-&gt;primary_table.$this-&gt;primary_id_column NOT IN (
				SELECT object_id
				FROM $wpdb-&gt;term_relationships
				WHERE term_taxonomy_id IN ($terms)
			)&quot;;

		} elseif ( &#039;AND&#039; === $operator ) {

			if ( empty( $terms ) ) {
				return $sql;
			}

			$num_terms = count( $terms );

			$terms = implode( &#039;,&#039;, $terms );

			$where = &quot;(
				SELECT COUNT(1)
				FROM $wpdb-&gt;term_relationships
				WHERE term_taxonomy_id IN ($terms)
				AND object_id = $this-&gt;primary_table.$this-&gt;primary_id_column
			) = $num_terms&quot;;

		} elseif ( &#039;NOT EXISTS&#039; === $operator || &#039;EXISTS&#039; === $operator ) {

			$where = $wpdb-&gt;prepare(
				&quot;$operator (
					SELECT 1
					FROM $wpdb-&gt;term_relationships
					INNER JOIN $wpdb-&gt;term_taxonomy
					ON $wpdb-&gt;term_taxonomy.term_taxonomy_id = $wpdb-&gt;term_relationships.term_taxonomy_id
					WHERE $wpdb-&gt;term_taxonomy.taxonomy = %s
					AND $wpdb-&gt;term_relationships.object_id = $this-&gt;primary_table.$this-&gt;primary_id_column
				)&quot;,
				$clause[&#039;taxonomy&#039;]
			);

		}

		$sql[&#039;join&#039;][]  = $join;
		$sql[&#039;where&#039;][] = $where;
		return $sql;
	}

	/**
	 * Identifies an existing table alias that is compatible with the current query clause.
	 *
	 * We avoid unnecessary table joins by allowing each clause to look for
	 * an existing table alias that is compatible with the query that it
	 * needs to perform.
	 *
	 * An existing alias is compatible if (a) it is a sibling of `$clause`
	 * (ie, it&#039;s under the scope of the same relation), and (b) the combination
	 * of operator and relation between the clauses allows for a shared table
	 * join. In the case of WP_Tax_Query, this only applies to &#039;IN&#039;
	 * clauses that are connected by the relation &#039;OR&#039;.
	 *
	 * @since 4.1.0
	 *
	 * @param array $clause       Query clause.
	 * @param array $parent_query Parent query of $clause.
	 * @return string|false Table alias if found, otherwise false.
	 */
	protected function find_compatible_table_alias( $clause, $parent_query ) {
		$alias = false;

		// Confidence check. Only IN queries use the JOIN syntax.
		if ( ! isset( $clause[&#039;operator&#039;] ) || &#039;IN&#039; !== $clause[&#039;operator&#039;] ) {
			return $alias;
		}

		// Since we&#039;re only checking IN queries, we&#039;re only concerned with OR relations.
		if ( ! isset( $parent_query[&#039;relation&#039;] ) || &#039;OR&#039; !== $parent_query[&#039;relation&#039;] ) {
			return $alias;
		}

		$compatible_operators = array( &#039;IN&#039; );

		foreach ( $parent_query as $sibling ) {
			if ( ! is_array( $sibling ) || ! $this-&gt;is_first_order_clause( $sibling ) ) {
				continue;
			}

			if ( empty( $sibling[&#039;alias&#039;] ) || empty( $sibling[&#039;operator&#039;] ) ) {
				continue;
			}

			// The sibling must both have compatible operator to share its alias.
			if ( in_array( strtoupper( $sibling[&#039;operator&#039;] ), $compatible_operators, true ) ) {
				$alias = preg_replace( &#039;/\W/&#039;, &#039;_&#039;, $sibling[&#039;alias&#039;] );
				break;
			}
		}

		return $alias;
	}

	/**
	 * Validates a single query.
	 *
	 * @since 3.2.0
	 *
	 * @param array $query The single query. Passed by reference.
	 */
	private function clean_query( &amp;$query ) {
		if ( empty( $query[&#039;taxonomy&#039;] ) ) {
			if ( &#039;term_taxonomy_id&#039; !== $query[&#039;field&#039;] ) {
				$query = new WP_Error( &#039;invalid_taxonomy&#039;, __( &#039;Invalid taxonomy.&#039; ) );
				return;
			}

			// So long as there are shared terms, &#039;include_children&#039; requires that a taxonomy is set.
			$query[&#039;include_children&#039;] = false;
		} elseif ( ! taxonomy_exists( $query[&#039;taxonomy&#039;] ) ) {
			$query = new WP_Error( &#039;invalid_taxonomy&#039;, __( &#039;Invalid taxonomy.&#039; ) );
			return;
		}

		if ( &#039;slug&#039; === $query[&#039;field&#039;] || &#039;name&#039; === $query[&#039;field&#039;] ) {
			$query[&#039;terms&#039;] = array_unique( (array) $query[&#039;terms&#039;] );
		} else {
			$query[&#039;terms&#039;] = wp_parse_id_list( $query[&#039;terms&#039;] );
		}

		if ( is_taxonomy_hierarchical( $query[&#039;taxonomy&#039;] ) &amp;&amp; $query[&#039;include_children&#039;] ) {
			$this-&gt;transform_query( $query, &#039;term_id&#039; );

			if ( is_wp_error( $query ) ) {
				return;
			}

			$children = array();
			foreach ( $query[&#039;terms&#039;] as $term ) {
				$children   = array_merge( $children, get_term_children( $term, $query[&#039;taxonomy&#039;] ) );
				$children[] = $term;
			}
			$query[&#039;terms&#039;] = $children;
		}

		$this-&gt;transform_query( $query, &#039;term_taxonomy_id&#039; );
	}

	/**
	 * Transforms a single query, from one field to another.
	 *
	 * Operates on the `$query` object by reference. In the case of error,
	 * `$query` is converted to a WP_Error object.
	 *
	 * @since 3.2.0
	 *
	 * @param array  $query           The single query. Passed by reference.
	 * @param string $resulting_field The resulting field. Accepts &#039;slug&#039;, &#039;name&#039;, &#039;term_taxonomy_id&#039;,
	 *                                or &#039;term_id&#039;. Default &#039;term_id&#039;.
	 */
	public function transform_query( &amp;$query, $resulting_field ) {
		if ( empty( $query[&#039;terms&#039;] ) ) {
			return;
		}

		if ( $query[&#039;field&#039;] === $resulting_field ) {
			return;
		}

		$resulting_field = sanitize_key( $resulting_field );

		// Empty &#039;terms&#039; always results in a null transformation.
		$terms = array_filter( $query[&#039;terms&#039;] );
		if ( empty( $terms ) ) {
			$query[&#039;terms&#039;] = array();
			$query[&#039;field&#039;] = $resulting_field;
			return;
		}

		$args = array(
			&#039;get&#039;                    =&gt; &#039;all&#039;,
			&#039;number&#039;                 =&gt; 0,
			&#039;taxonomy&#039;               =&gt; $query[&#039;taxonomy&#039;],
			&#039;update_term_meta_cache&#039; =&gt; false,
			&#039;orderby&#039;                =&gt; &#039;none&#039;,
		);

		// Term query parameter name depends on the &#039;field&#039; being searched on.
		switch ( $query[&#039;field&#039;] ) {
			case &#039;slug&#039;:
				$args[&#039;slug&#039;] = $terms;
				break;
			case &#039;name&#039;:
				$args[&#039;name&#039;] = $terms;
				break;
			case &#039;term_taxonomy_id&#039;:
				$args[&#039;term_taxonomy_id&#039;] = $terms;
				break;
			default:
				$args[&#039;include&#039;] = wp_parse_id_list( $terms );
				break;
		}

		if ( ! is_taxonomy_hierarchical( $query[&#039;taxonomy&#039;] ) ) {
			$args[&#039;number&#039;] = count( $terms );
		}

		$term_query = new WP_Term_Query();
		$term_list  = $term_query-&gt;query( $args );

		if ( is_wp_error( $term_list ) ) {
			$query = $term_list;
			return;
		}

		if ( &#039;AND&#039; === $query[&#039;operator&#039;] &amp;&amp; count( $term_list ) &lt; count( $query[&#039;terms&#039;] ) ) {
			$query = new WP_Error( &#039;inexistent_terms&#039;, __( &#039;Inexistent terms.&#039; ) );
			return;
		}

		$query[&#039;terms&#039;] = wp_list_pluck( $term_list, $resulting_field );
		$query[&#039;field&#039;] = $resulting_field;
	}
}
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