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Retrieve YouTube video ID from a YT URL

/ Published in: PHP
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This code allows you to retrieve the 11-character ID string from a YouTube video URL.

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  1. /* 
  2. 	 * Retrieve the video ID from a YouTube video URL
  3. 	 * @param $ytURL The full YouTube URL from which the ID will be extracted
  4. 	 * @return $ytvID The YouTube video ID string
  5. 	 */
  6. 	function getYTid($ytURL) {
  7.  
  8. 		$ytvIDlen = 11;	// This is the length of YouTube's video IDs
  9.  
  10. 		// The ID string starts after "v=", which is usually right after 
  11. 		// "youtube.com/watch?" in the URL
  12. 		$idStarts = strpos($ytURL, "?v=");
  13.  
  14. 		// In case the "v=" is NOT right after the "?" (not likely, but I like to keep my 
  15. 		// bases covered), it will be after an "&":
  16. 		if($idStarts === FALSE)
  17. 			$idStarts = strpos($ytURL, "&v=");
  18. 		// If still FALSE, URL doesn't have a vid ID
  19. 		if($idStarts === FALSE)
  20. 			die("YouTube video ID not found. Please double-check your URL.");
  21.  
  22. 		// Offset the start location to match the beginning of the ID string
  23. 		$idStarts +=3;
  24.  
  25. 		// Get the ID string and return it
  26. 		$ytvID = substr($ytURL, $idStarts, $ytvIDlen);
  27.  
  28. 		return $ytvID;
  29.  
  30. 	}

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