WP_Query::parse_search_order( array $q ): string

Source

protected function parse_search_order( &$q ) {
	global $wpdb;

	if ( $q['search_terms_count'] > 1 ) {
		$num_terms = count( $q['search_orderby_title'] );

		// If the search terms contain negative queries, don't bother ordering by sentence matches.
		$like = '';
		if ( ! preg_match( '/(?:\s|^)\-/', $q['s'] ) ) {
			$like = '%' . $wpdb->esc_like( $q['s'] ) . '%';
		}

		$search_orderby = '';

		// Sentence match in 'post_title'.
		if ( $like ) {
			$search_orderby .= $wpdb->prepare( "WHEN {$wpdb->posts}.post_title LIKE %s THEN 1 ", $like );
		}

		/*
		 * Sanity limit, sort as sentence when more than 6 terms
		 * (few searches are longer than 6 terms and most titles are not).
		 */
		if ( $num_terms < 7 ) {
			// All words in title.
			$search_orderby .= 'WHEN ' . implode( ' AND ', $q['search_orderby_title'] ) . ' THEN 2 ';
			// Any word in title, not needed when $num_terms == 1.
			if ( $num_terms > 1 ) {
				$search_orderby .= 'WHEN ' . implode( ' OR ', $q['search_orderby_title'] ) . ' THEN 3 ';
			}
		}

		// Sentence match in 'post_content' and 'post_excerpt'.
		if ( $like ) {
			$search_orderby .= $wpdb->prepare( "WHEN {$wpdb->posts}.post_excerpt LIKE %s THEN 4 ", $like );
			$search_orderby .= $wpdb->prepare( "WHEN {$wpdb->posts}.post_content LIKE %s THEN 5 ", $like );
		}

		if ( $search_orderby ) {
			$search_orderby = '(CASE ' . $search_orderby . 'ELSE 6 END)';
		}
	} else {
		// Single word or sentence search.
		$search_orderby = reset( $q['search_orderby_title'] ) . ' DESC';
	}

	return $search_orderby;
}

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