If value is divisible by 2

From: Date: Tue, 30 Apr 2002 08:00:33 +0000
Subject: If value is divisible by 2
Groups: php.general 
Request: Send a blank email to php-general+get-95329@lists.php.net to get a copy of this message
I am trying to write an if statement that says if the value $foo is divisible by 2 then echo "text" i have tried mod but it isnt recognised any ideas?

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