How would you create a tracking pixel?

From: Date: Mon, 25 Jul 2005 19:24:07 +0000
Subject: How would you create a tracking pixel?
Groups: php.general 
Request: Send a blank email to php-general+get-219306@lists.php.net to get a copy of this message
I want to create a pixel that can be used to track certain activity on the site. I've got it working fine: I just mod_rewrite "spacer.gif" to a PHP app that does what I want it to do; but then I don't know how to actually return a blank pixel. Can anyone point me in the right direction?

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