Re: How would you create a tracking pixel?

Thanks. A transparent pixel is what I'll need - any guidance on that? On Jul 25, 2005, at 12:37 PM, Matt Darby wrote:

A blank (transparent) pixel would be more difficult, but a simple colored pixel would be easy: In target file: <img src=pixel.php> pixel.php <? $im=imagecreate(1,1); $white=imagecolorallocate($im,255,255,255); imagesetpixel($im,1,1,$white); header("content-type:image/jpg"); imagejpeg($im); imagedestroy($im); ?> I guess this begs the question, why not use session variables to track activity?? Matt Darby Brian Dunning wrote:

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?