Get direct link videos from Vimeo in PHP

I want a direct link to videos from Vimeo with a PHP script. I managed to find them manually, but my PHP script does not work. Here is the initiative: For example I took this video: http://vimeo.com/22439234

When you go on the page, Vimeo generates a signature associated with the current timestamp and this video. This information is stored in a JavaScript variable, around line 520 just after: window.addEvent ('domready', function () {

Then when you click Play, the HTML5 player reads this variable and sends an HTTP request:

http:// player.vimeo.com/play_redirect?clip_id=37111719&sig={SIGNATURE}&time={TIMESTAMP}&quality=sd&codecs=H264,VP8,VP6&type=moogaloop_local&embed_location=

But it also works with:

http:// player.vimeo.com/play_redirect?clip_id=37111719&sig={SIGNATURE}&time={TIMESTAMP}&quality=sd

If this URL does not open with the IP address that opened http://vimeo.com/22439234, this returns the HTTP code 200 with an error message.

If this URL is opened with the correct IP address, the header "Location" redirects to link to the video file: http://av.vimeo.com/XXX/XX/XXXX.mp4?aksessionid=XXXX&token=XXXXX_XXXXXXXXX

When I build this link http://player.vimeo.com/play_redirect?... manually ("right click"> "source code"> "line 520") it works.

But with PHP and regex it returns the HTTP code 200 with an error message.

Why ?

From my observations, Vimeo does not check the headers of the HTTP request for http:// player.vimeo.com/play_redirect?... GET, HEAD, with cookies, without cookies, referrer etc. ... does not change.

With PHP, I use the function file_get_contents() and get_hea