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WP_Query::parse_search_terms() WP 3.7.0

Check if the terms are suitable for searching.

Uses an array of stopwords (terms) that are excluded from the separate term matching when searching for posts. The list of English stopwords is the approximate search engines list, and is translatable.

This is a method of the class: WP_Query

No Hooks.

Return

Array. Terms that are not stopwords.

Usage

$WP_Query = new WP_Query();
$var = $WP_Query->parse_search_terms( $terms );
$terms(string[]) (required)
Array of terms to check.

Changelog

Since 3.7.0 Introduced.

Code of WP Query::parse search terms: wp-includes/class-wp-query.php WP 5.2.3

<?php
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;
}