Nearly every line in your code is just nonsense.
somthing.com?udid=(me1,456)&&udid=(me2,457)
This will not work. You are using the same variable name twice, overwriting the first so only the second will be available in your PHP. If you want to use multiple variables you have to give every one a name or use an array:
somthing.com?udid[]=(me1,456)&&udid[]=(me2,457)
But this won't help you much, you have to split everything again. It will be easier if you call your script like this: