PHP and mysql script error in webhosting

Hi all, My php files run well in my local PC but some of PHP and mysql script just getting error when running in webhosting server. I found out that the problem is in the way webhosting server handling global variable. for example : In my local PC : $_GET['var'] is different with $var but in webhosting server : $GET['var'] is the same with $var... I don't need to declare $var=$_GET['var'] 'cause $var is the same with $_GET['var']... Anyone have such a problem before? Thanx By regard; Flame