combine empty and trim

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To: php-general@xxxxxxxxxxxxx
Subject: combine empty and trim
From: "Ross" <ross@xxxxxxxxxxxxx>
Date: Mon, 26 Mar 2007 16:17:02 +0100
Reply-to: "Ross" <ross@xxxxxxxxxxxxx>

I want to trim any whitepace and check if it is empty in the same  line this 
is not working.

if (empty(trim($_POST['_createcategory']))) { 

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