WP_Term_Query::parse_orderby_meta( string $orderby_raw ): string

1022	protected function parse_orderby_meta( $orderby_raw ) {1023		$orderby = '';1024 1025		// Tell the meta query to generate its SQL, so we have access to table aliases.1026		$this->meta_query->get_sql( 'term', 't', 'term_id' );1027		$meta_clauses = $this->meta_query->get_clauses();1028		if ( ! $meta_clauses || ! $orderby_raw ) {1029			return $orderby;1030		}1031 1032		$allowed_keys       = array();1033		$primary_meta_key   = null;1034		$primary_meta_query = reset( $meta_clauses );1035		if ( ! empty( $primary_meta_query['key'] ) ) {1036			$primary_meta_key = $primary_meta_query['key'];1037			$allowed_keys[]   = $primary_meta_key;1038		}1039		$allowed_keys[] = 'meta_value';1040		$allowed_keys[] = 'meta_value_num';1041		$allowed_keys   = array_merge( $allowed_keys, array_keys( $meta_clauses ) );1042 1043		if ( ! in_array( $orderby_raw, $allowed_keys, true ) ) {1044			return $orderby;1045		}1046 1047		switch ( $orderby_raw ) {1048			case $primary_meta_key:1049			case 'meta_value':1050				if ( ! empty( $primary_meta_query['type'] ) ) {1051					$orderby = "CAST({$primary_meta_query['alias']}.meta_value AS {$primary_meta_query['cast']})";1052				} else {1053					$orderby = "{$primary_meta_query['alias']}.meta_value";1054				}1055				break;1056 1057			case 'meta_value_num':1058				$orderby = "{$primary_meta_query['alias']}.meta_value+0";1059				break;1060 1061			default:1062				if ( array_key_exists( $orderby_raw, $meta_clauses ) ) {1063					// $orderby corresponds to a meta_query clause.1064					$meta_clause = $meta_clauses[ $orderby_raw ];1065					$orderby     = "CAST({$meta_clause['alias']}.meta_value AS {$meta_clause['cast']})";1066				}1067				break;1068		}1069 1070		return $orderby;1071	}