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The only way you can "trap" these variables is if you parse the URI in your php script. If they are hidden or session variables you are basically screwed unless you already know the variable names associated with the page you are attempting to 'scan'.
People that have accomplished what I think you are trying to do have been given explicit permission from the sites they are parsing and have been granted access to some sort of an API that said site(s) have available.
I may not be Completely accurate here but I think that using any kind of TCP socket connection to said web page will not garner you the info you wish to gather.
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