EVE Technology Lab

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If you're using Apache 2.4, or Nginx, you'll have a problem with using the headers. Because, as they have underscores in them, they're being stripped.

However, it looks like you're using Apache 2.2 (You're a little behind on patching, btw. You might want to see about adding a servertokens prod directive and ServerSignature Off while you're at it.)

You're getting an internal server error, leading to the white page.
Probably caused by:
$ingame = (strstr($_SERVER['HTTP_USER_AGENT'], == 'Python-urllib/2.5'));

I'm assuming you're trying to look for the string, then evaluating it (so if it's not 0, it's true), if so, just take out the ==

As for checking for the IGB, I am searching for the string "EVE-IGB", which also makes it more expressive what you are looking for. I don't know by heart whether the given "Python..." string is included.
Try an echo on it to see the contents. (There's also the phpinfo() function that dumps you the complete environment)

Second, an this will give you more work and things you'll need to understand, the "CCPEVE.requestTrust" line is meant to be in a JavaScript block that is to be executed in the browser. This line in the PHP context on the server wont work.
Like I wrote before, if the PHP script determines that the IGB does not trust your site, it will need to send back a valid HTML page and this page needs the call to requestTrust() . If your PHP script is executed without trust, it won't receive it suddenly.

The sequence would look like:
Client -> Server: GET page.php (no trust)
Server -> Client: OK (HTML page with the JavaScript call, either statically onLoad or by button press or...)
Client -> User: Request Trust Popup
(Then trigger a reload, either by script or explicitly by user)
Client -> Server: GET page.php (with trust)
Server -> Client: OK (process result)

And third, a general warning: I guess you want to achieve a lock over your private data/restricted access area. Checking this merely by testing browser header is wrong. It works, but not the way you intend it. Especially since your script is public, anyone can fake these headers by readily available tools and break into your site.

Finally, as you are copy/pasting things around, I need to ask whether you simply want a job done or want to learn the programming languages and necessary APIs for your task. For the former I suggest you look for others willing to do it for you (There's a thread for example here) and for the latter, I suggest you dig into the basics of the languages first, including learning some basic debugging tools & helper.