Bugfix in MySQLUserDAO: passed value by reference in the loop

classes/datalayer/mysql/MySQLUserDAO.php

@@ -206,7 +206,7 @@ class MySQLUserDAO extends BaseMySQLDAO implements UserDAO {
 
         $stmt = $dbh->prepare($query);
 
-        foreach ($identifiers as $id) {
+        foreach ($identifiers as &$id) {
             $stmt->bindParam(':id_' . $id, $id);
         }