$dbw = wfGetDB( DB_MASTER );
$dbw->delete( 'user', array( 'user_id' => $del ), __METHOD__ );
$dbw->delete( 'user_groups', array( 'ug_user' => $del ), __METHOD__ );
$dbw = wfGetDB( DB_MASTER );
$dbw->delete( 'user', array( 'user_id' => $del ), __METHOD__ );
$dbw->delete( 'user_groups', array( 'ug_user' => $del ), __METHOD__ );