How to use Pixel Tracking across domains in PHP -

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I understand the basics of pixel tracking, I am able to insert a pixel that references an image on my tracking domain The other gives websites to the other.

However, how can I increase the actual pixel count on my tracking domain? Is there a log that tells me every time that the pixel image was served? Am I able to do something like this: 

  & lt; Img src = "http://www.foo.com/serveImage/getImage.php?id=5123" />

Then get the getImage page based on that ID, which leads to image and service growth? Or is there a better way to achieve this?

Thank you in advance.

If you just want to output GIF, this is a quick easy way, just make sure that your The script does not come before or after: 

  header ("content-type: image / gif"); Header ("content-length: 43"); $ Fp = fopen ("php: // output", "wb"); Fwrite ($ fp, "GIF89a \ x01 \ x00 \ x01 \ x00 \ x80 \ x00 \ x00 \ xFF \ xFF", 15); Fwrite ($ fp, "\ xFF \ x00 \ x00 \ x00 \ x21 \ xF9 \ x04 \ x01 \ x00 \ x00 \ x00 \ x00", 12); Fwrite ($ fp, "\ x2C \ x00 \ x00 \ x00 \ x00 \ x01 \ x00 \ x01 \ x00 \ x00 \ x02 \ x02", 12); Fwrite ($ fp, "\ x44 \ x01 \ x00 \ x3B", 4); Fclose ($ FP);

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