How to validate the google video code?

In my project, users insert a Google Video code into a textbox - I'd like to certify that the video being referenced does indeed exist. I'm presently using the YouTube开发者_开发知识库 API to do something similar with YouTube references, but I'm not sure what would be the best method with Google Video. Any direction would be appreciated.

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Can you request the URL and see if it 404s or not?

function googleVideoExist($id) {
    // Validate id however you need to
    $id = (int) $id;

    $headers = get_headers('http://video.google.com/videoplay?docid=' . $id, TRUE);

    // get_headers() follows Location: headers,
    // and they are all sent back in sequential order
    foreach(array_reverse($headers) as $header => $value) {
        if (strstr($value, '200')) {
          return TRUE;
       }
    }

    return FALSE;
}

URL above is a guide only - adapt it to suit. Also, you can use cURL if you are more comfortable with that.