php - Check if Youtube and Vimeo-clips are valid

Question

I have been trying for quite a while to check if submitted links are valid film-clips from youtube.com or vimeo.com but I didn't succeed.

Any ideas how to check url's like:

http://www.youtube.com/watch?v=jc0rnCBCX2c&feature=fvhl (valid)
http://www.youtube.com/watch?v=jc0FFCBCX2c&feature=fvhl (not valid)
http://www.youtube.com/v/jc0rnCBCX2c (valid)
http://www.youtube.com/v/ddjcddddX2c (not valid)
http://www.vimeo.com/463l522 (not valid)
http://www.vimeo.com/1483909 (valid)
http://www.vimeo.com/lumiblue (not valid)
http://www.youtube.com/user/dd181921 (not valid)

?

I use php.

Answer 1

If you check the response headers from a request to http://gdata.youtube.com/feeds/api/videos/videoId where videoId is the google video Identifier, you should get a 200 if the video exists and a 400 (bad request) if the video doesn't exist.

// PHP code

// Check if youtube video item exists by the existance of the the 200 response
$headers = get_headers('http://gdata.youtube.com/feeds/api/videos/' . $youtubeId);
if (!strpos($headers[0], '200')) {
    echo "The YouTube video you entered does not exist";
    return false;
}