wp-includes/class-wp-query.php:1517Checks if the terms are suitable for searching.
$termsstring[]string[] protected function parse_search_terms( $terms ) { $strtolower = function_exists( 'mb_strtolower' ) ? 'mb_strtolower' : 'strtolower'; $checked = array(); $stopwords = $this->get_search_stopwords(); foreach ( $terms as $term ) { // Keep before/after spaces when term is for exact match. if ( preg_match( '/^".+"$/', $term ) ) { $term = trim( $term, "\"'" ); } else { $term = trim( $term, "\"' " ); } // Avoid single A-Z and single dashes. if ( ! $term || ( 1 === strlen( $term ) && preg_match( '/^[a-z\-]$/i', $term ) ) ) { continue; } if ( in_array( call_user_func( $strtolower, $term ), $stopwords, true ) ) { continue; } $checked[] = $term; } return $checked; }Introduced in 3.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-query.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.