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run code in 150+ php & hhvm versions
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<?php $videoURLs = array( 'http://www.youtube.com/embed/VIDEO_ID', 'http://youtu.be/VIDEO_ID', 'http://www.youtube.com/v/VIDEO_ID', 'http://www.youtube.com/watch?v=VIDEO_ID', ); foreach ($videoURLs as $urlNow) { $url = parse_url($urlNow); $url['path'] = str_replace(array('/v/', '/embed/', '/'), '', $url['path']); if (isset($url['query'])) { parse_str($url['query'], $query); } $videoID = (isset($query) && is_array($query) && isset($query['v'])) ? $query['v'] : $url['path']; var_dump($urlNow, $videoID); } ?>
Output for 4.3.0 - 7.1.0
string(37) "http://www.youtube.com/embed/VIDEO_ID" string(8) "VIDEO_ID" string(24) "http://youtu.be/VIDEO_ID" string(8) "VIDEO_ID" string(33) "http://www.youtube.com/v/VIDEO_ID" string(8) "VIDEO_ID" string(39) "http://www.youtube.com/watch?v=VIDEO_ID" string(8) "VIDEO_ID"