Improve like_escape to also escape '\'. Fixes #10041 props miau_jp and Denis-de-Bernardy.

git-svn-id: http://svn.automattic.com/wordpress/trunk@12460 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/formatting.php

@@ -2410,7 +2410,7 @@ function tag_escape($tag_name) {
  * @return string text, safe for inclusion in LIKE query.
  */
 function like_escape($text) {
-	return str_replace(array("%", "_"), array("\\%", "\\_"), $text);
+	return addcslashes($text, '\\%_'); 
 }
 
 /**