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<?php

$url = array (
'http://youtu.be/dQw4w9WgXcA',
'http://www.youtube.com/embed/dQw4w9WgXcB',
'http://www.youtube.com/watch?v=dQw4w9WgXcC',
'http://www.youtube.com/?v=dQw4w9WgXcD',
'http://www.youtube.com/v/dQw4w9WgXcE',
'http://www.youtube.com/e/dQw4w9WgXcF',
'http://www.youtube.com/user/username#p/u/11/dQw4w9WgXcG',
'http://www.youtube.com/sandalsResorts#p/c/54B8C800269D7C1B/0/dQw4w9WgXcH',
'http://www.youtube.com/watch?feature=player_embedded&v=dQw4w9WgXcI',
'http://www.youtube.com/?feature=player_embedded&v=dQw4w9WgXcJ'
);

// Extracts the YouTube ID from various URL structures
foreach ($url as $value) {
	if (preg_match('%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^"&?/ ]{11})%i', $value, $match)) {
    	$id = $match[1];
    	var_dump($id);
	}
}

?>