cf to php

From: Date: Mon, 19 Mar 2001 07:59:34 +0000
Subject: cf to php
Groups: php.general 
Request: Send a blank email to php-general+get-44499@lists.php.net to get a copy of this message
is there a php equivalent for this little tidbit from a friend's cf script? here it is: <cfif NOT ISDEFINED("url.page")>

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