<?

$url= "http://www.youtube.com/watch?ist=PL0E8ECDEA23DA6D15&feature=player_detailpage&v=zCSQE5Lwk2s"; 

preg_match("/https?:\/\/(?:[0-9A-Z-]+\.)?(?:youtu\.be\/|youtube\.com\S*[^\w\-\s])([\w\-]{11})(?=[^\w\-]|$)(?![?=&+%\w]*(?:['\"][^<>]*>|<\/a>))[?=&+%\w-]*/is", $url, $mat);

var_dump($mat);

$pattern = '/(?:(?:\?|&)v=|\/)([A-Za-z0-9]{11})/';$url = 'http://www.youtube.com/watch?v=KMU0tzLwhbE';preg_match($pattern, $url, $matches);echo $matches[1];

$video_url = "http://www.youtube.com/watch?v=KMU0tzLwhbE"; 

// http://youtu.be/KMU0tzLwhbE

$url_parts = parse_url($video_url);

if (isset($url_parts["query"]) && (strpos($url_parts["query"], "v") !== false)) 

{ 

 parse_str($url_parts["query"], $vars);

 // Handle full URLs with query string like 'http://www.youtube.com/watch?v=KMU0tzLwhbE' 

if (isset($vars["v"]) && $vars["v"]) 

{

 $video_code = $vars["v"]; // Handle the new short URLs like 'http://youtu.be/KMU0tzLwhbE' 

} else if ($url_parts['path'])

 { 

 $video_code = trim($url_parts['path'], '/');

 }

}

Quick reference for Grabbing video IDs from Youtube and Vimeo.

*Note $string is the string containing youtube or vimeo link, can also contain rubbish.
** Note2: Video ID will be return in $output. Different PregMatch will result in Video ID being located differently in $output.

Youtube

There’s 2 formats, the latter youtu.be was launch fairly recently. Both formats uses the same video ID so it’s just 2 different extraction methods.

URL Format 1 (Traditional http://www.youtube.com/watch?v=zWw-823VTY0)

preg_match_all('#(http://www.youtube.com)?/(v/([-|~_0-9A-Za-z]+)|watch\?v\=([-|~_0-9A-Za-z]+)&?.*?)#i',$string,$output);

$output[4][0] will contain the Video ID.

URL Format 2 (New http://youtu.be/asdasdasd)

preg_match_all('#(http://youtu.be/)([-|~_0-9A-Za-z]+)#i',$string,$output);

$output[2][0] will contain the Video ID.

Vimeo (http://player.vimeo.com/video/1234567)

preg_match_all('#(http://vimeo.com)/([0-9]+)#i',$string,$output);

$output[2][0] will contain the Video ID.

// ------------------- 아래는 parse_str 방식 추출