Search query in Wordpress

// If a search pattern is specified, load the posts that match
		if ( !empty($q['s']) ) {
			// added slashes screw with quote grouping when done early, so done later
			$q['s'] = stripslashes($q['s']);
			if ( !empty($q['sentence']) ) {
				$q['search_terms'] = array($q['s']);
			} else {
				preg_match_all('/".*?("|$)|((?<=[\\s",+])|^)[^\\s",+]+/', $q['s'], $matches);
				$q['search_terms'] = array_map(create_function('$a', 'return trim($a, "\\"\'\\n\\r ");'), $matches[0]);
			}
			$n = !empty($q['exact']) ? '' : '%';
			$searchand = '';
			foreach( (array) $q['search_terms'] as $term) {
				$term = addslashes_gpc($term);
				$search .= "{$searchand}(($wpdb->posts.post_title LIKE '{$n}{$term}{$n}') OR ($wpdb->posts.post_content LIKE '{$n}{$term}{$n}'))";
				$searchand = ' AND ';
			}
			$term = $wpdb->escape($q['s']);
			if (empty($q['sentence']) && count($q['search_terms']) > 1 && $q['search_terms'][0] != $q['s'] )
				$search .= " OR ($wpdb->posts.post_title LIKE '{$n}{$term}{$n}') OR ($wpdb->posts.post_content LIKE '{$n}{$term}{$n}')";
 
			if ( !empty($search) ) {
				$search = " AND ({$search}) ";
				if ( !is_user_logged_in() )
					$search .= " AND ($wpdb->posts.post_password = '') ";
			}
		}