Posted by Brian Dunning on 07/25/05 22:44

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?
>>
>

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