How to check for a $_GET without throwing a Notice?

From: Date: Wed, 26 May 2004 15:01:30 +0000
Subject: How to check for a $_GET without throwing a Notice?
Groups: php.general 
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How do I check for the presence of an optional $_GET param without throwing a "Notice: Undefined index" when the param is not present? Tried all three of these, they all produce the Notice when the param is not passed: if ($_GET['id']) if ($_GET['id'] != "") if (isset $_GET['id'])

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