[PHP] unset($_GET['i'])

[Bill]

Hi

given page1 has a list of goods and sends $i as a variable into a link 
to page2, ie, <a href="page2.php?i=3">send</a>

Page2 adds the items recieved in an array.

In page2 how can I unset the $_GET['i'] so that if I press F5(refresh) 
it doesn't add the same item to the array ?

I tried unset($_GET['i']) but no success.

Thanks

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