Move _wp_search_sql() into WP_Object_Query. Introduce WP_Comment_Search. See #15032

git-svn-id: http://svn.automattic.com/wordpress/trunk@15723 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -4236,26 +4236,6 @@ function get_file_data( $file, $default_headers, $context = '' ) {
 	return $file_data;
 }
 
-/*
- * Used internally to generate an SQL string for searching across multiple columns
- *
- * @access private
- * @since 3.1.0
- *
- * @param string $string
- * @param array $cols
- * @return string
- */
-function _wp_search_sql($string, $cols) {
-	$string = esc_sql($string);
-
-	$searches = array();
-	foreach ( $cols as $col )
-		$searches[] = "$col LIKE '%$string%'";
-
-	return ' AND (' . implode(' OR ', $searches) . ')';
-}
-
 /*
  * Used internally to tidy up the search terms
  *