[Solved] Fatal error in if stament [duplicate]

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Just change the condition to:

if(isset($_REQUEST['userid']) && $_REQUEST['userid'] > $user_hack)

isset tells is a variable is set, while this statement may be true or false, on which you cannot call isset function.

Until you check if(isset($_REQUEST['userid'])), you cannot assign it to $userid variable.

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solved Fatal error in if stament [duplicate]