How do I check if a video exists on YouTube, using PHP?

Question

How do I check if a video exists on YouTube, using PHP?

Answer 1

Youtube has support for the oEmbed format.
Compared to the xml responsed provided by Pascal MARTIN, mine has only to download 600 bytes against 3800 bytes, making it faster and less bandwidth cosuming (only 1/6 of the size).

function yt_exists($videoID) {
    $theURL = "http://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=$videoID&format=json";
    $headers = get_headers($theURL);

    return (substr($headers[0], 9, 3) !== "404");
}

$id = 'yyDUC1LUXSU'; //Video id goes here

if (yt_exists($id)) {
    //  Yep, video is still up and running :)
} else {
    //  These aren't the droids you're looking for :(
}