Ticket #2221: addslashes to sanitize_user.diff

functions-formatting.php

@@ -266 +266 @@
 }
 
 function sanitize_user( $username ) {
-        return preg_replace('|a-z0-9 _.-|i', '', $username);
+        return addslashes(preg_replace('|a-z0-9 _.-|i', '', $username));
 }
 
 function sanitize_title($title, $fallback_title = '') {