Description:
------------
There is problem with switch/case settlement, when the argument is number an the cases are strings; 

Reproduce code:
---------------
$do = 0;
switch ($do)
{
	case 'add':
		print 'we add';
		break;
	case 'upd':
		print 'we update';
		break;
	default: // default display only
		print 'we only display';
		break;
}

Expected result:
----------------
we only display

Actual result:
--------------
we add