从YT URL检索YouTube视频ID

Posted 2021-02-26

This code allows you to retrieve the 11-character ID string from a YouTube video URL.

/* 
	 * Retrieve the video ID from a YouTube video URL
	 * @param $ytURL The full YouTube URL from which the ID will be extracted
	 * @return $ytvID The YouTube video ID string
	 */
	function getYTid($ytURL) {
 
		$ytvIDlen = 11;	// This is the length of YouTube's video IDs
 
		// The ID string starts after "v=", which is usually right after 
		// "youtube.com/watch?" in the URL
		$idStarts = strpos($ytURL, "?v=");
 
		// In case the "v=" is NOT right after the "?" (not likely, but I like to keep my 
		// bases covered), it will be after an "&":
		if($idStarts === FALSE)
			$idStarts = strpos($ytURL, "&v=");
		// If still FALSE, URL doesn't have a vid ID
		if($idStarts === FALSE)
			die("YouTube video ID not found. Please double-check your URL.");
 
		// Offset the start location to match the beginning of the ID string
		$idStarts +=3;
 
		// Get the ID string and return it
		$ytvID = substr($ytURL, $idStarts, $ytvIDlen);
 
		return $ytvID;
 
	}