Determine if variable is set

From: Date: Tue, 11 Jun 2002 13:06:34 +0000
Subject: Determine if variable is set
Groups: php.general 
Request: Send a blank email to php-general+get-101541@lists.php.net to get a copy of this message
This is probably an easy answer, but I cannot seem to find it. Is it possible to determine whether a variable is set with either $_POST or $GET without having to do: if(isset($_POST['foo']) || isset($_GET['foo'])) 
    //do something
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