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Validate YouTube Video

/ Published in: PHP
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This function validates the URL of a YouTube video. It supports four kinds of URL: ?v=, /v/, #!v=, and the short version (youtu.be).

To validate the ID a request to YouTube is made, this is done using a personal class utilizing cURL.

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  1. public function isYoutubeVideo($value) {
  2. 	$isValid = false;
  3.         //validate the url, see: http://snipplr.com/view/50618/
  4. 	if (isValidURL($value)) {
  5.                 //code adapted from Moridin: http://snipplr.com/view/19232/                
  6. 		$idLength = 11;
  7. 		$idOffset = 3;
  8. 		$idStarts = strpos($value, "?v=");
  9. 		if ($idStarts === FALSE) {
  10. 			$idStarts = strpos($value, "&v=");
  11. 		}
  12. 		if ($idStarts === FALSE) {
  13. 			$idStarts = strpos($value, "/v/");
  14. 		}
  15. 		if ($idStarts === FALSE) {
  16. 			$idStarts = strpos($value, "#!v=");
  17. 			$idOffset = 4;
  18. 		}
  19. 		if ($idStarts === FALSE) {
  20. 			$idStarts = strpos($value, "youtu.be/");
  21. 			$idOffset = 9;
  22. 		}
  23. 		if ($idStarts !== FALSE) {
  24.                         //there is a videoID present, now validate it
  25. 			$videoID = substr($value, $idStarts + $idOffset, $idLength);
  26. 			$http = new HTTP("http://gdata.youtube.com");
  27. 			$result = $http->doRequest("/feeds/api/videos/".$videoID, "GET");
  28.                         //returns Array('headers' => Array(), 'body' => String);
  29. 			$code = $result['headers']['http_code'];
  30.                         //did the request return a http code of 2xx?
  31. 			if (substr($code, 0, 1) == 2) {
  32. 				$isValid = true;
  33. 			}
  34. 		}
  35. 	}
  36. 	return $isValid;
  37. }

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