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copied!<p>Here is an example function that uses a regular expression to extract the youtube ID from a URL:</p> <pre><code>/** * get youtube video ID from URL * * @param string $url * @return string Youtube video id or FALSE if none found. */ function youtube_id_from_url($url) { $pattern = '%^# Match any youtube URL (?:https?://)? # Optional scheme. Either http or https (?:www\.)? # Optional www subdomain (?: # Group host alternatives youtu\.be/ # Either youtu.be, | youtube\.com # or youtube.com (?: # Group path alternatives /embed/ # Either /embed/ | /v/ # or /v/ | /watch\?v= # or /watch\?v= ) # End path alternatives. ) # End host alternatives. ([\w-]{10,12}) # Allow 10-12 for 11 char youtube id. $%x' ; $result = preg_match($pattern, $url, $matches); if ($result) { return $matches[1]; } return false; } echo youtube_id_from_url('http://youtu.be/NLqAF9hrVbY'); # NLqAF9hrVbY </code></pre> <p>It's an adoption <a href="https://stackoverflow.com/questions/5830387/php-regex-find-all-youtube-video-ids-in-string/5831191#5831191">of the answer from a similar question</a>.</p> <hr> <p>It's not directly the API you're looking for but probably helpful. Youtube has an <a href="http://oembed.com/" rel="nofollow noreferrer">oembed</a> service:</p> <pre><code>$url = 'http://youtu.be/NLqAF9hrVbY'; var_dump(json_decode(file_get_contents(sprintf('http://www.youtube.com/oembed?url=%s&format=json', urlencode($url))))); </code></pre> <p>Which provides some more meta-information about the URL:</p> <pre><code>object(stdClass)#1 (13) { ["provider_url"]=> string(23) "http://www.youtube.com/" ["title"]=> string(63) "Hang Gliding: 3 Flights in 8 Days at Northside Point of the Mtn" ["html"]=> string(411) "<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/NLqAF9hrVbY?version=3"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/NLqAF9hrVbY?version=3" type="application/x-shockwave-flash" width="425" height="344" allowscriptaccess="always" allowfullscreen="true"></embed></object>" ["author_name"]=> string(11) "widgewunner" ["height"]=> int(344) ["thumbnail_width"]=> int(480) ["width"]=> int(425) ["version"]=> string(3) "1.0" ["author_url"]=> string(39) "http://www.youtube.com/user/widgewunner" ["provider_name"]=> string(7) "YouTube" ["thumbnail_url"]=> string(48) "http://i3.ytimg.com/vi/NLqAF9hrVbY/hqdefault.jpg" ["type"]=> string(5) "video" ["thumbnail_height"]=> int(360) } </code></pre> <p>But the ID is not a direct part of the response. However it might contain the information you're looking for and it might be useful to validate the youtube URL.</p>

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