以下是使用正则表达式从URL提取youtube ID的示例函数：
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它不是您要查找的API的直接来源，但可能会有所帮助。Youtube有一项固定服务：
$url = 'http://youtu.be/NLqAF9hrVbY';var_dump(json_depre(file_get_contents(sprintf('http://www.youtube.com/oembed?url=%s&format=json', urlenpre($url)))));其中提供了有关URL的更多元信息：
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="allowscr-iptaccess" value="always"></param><embed src="http://www.youtube.com/v/NLqAF9hrVbY?version=3" type="application/x-shockwave-flash" width="425" height="344" 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)}但是ID并不是响应的直接部分。但是，它可能包含您要查找的信息，并且可能对验证youtube URL有用。
