Verify whether a YouTube video exists using PHP and oEmbed

/**
     * Verify whether a YouTube video exists using PHP and oEmbed status codes
     * @author Ivan Melgrati
     * @copyright 2018
     */

    function YouTube_Check_ID($videoID)
    {
        $is_valid = true;
        // YouTube oEmbed API endpoint (https://www.youtube.com/oembed)
        // Query it using the video's URL as parameter
        // The "format" parameter may be either JSON or XML. Not relevant for this tes.
        $theURL = "http://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=$videoID&format=json";
        $file_headers = @get_headers($url);
        if ($file_headers === false)
        {
            $is_valid = false; // when server not found
        }
        else
        {
            foreach ($file_headers as $header)
            {
                // Parse all headers. Corrects $url when 301/302 redirect(s) lead(s) to 200:
                if (preg_match("/^Location: (http.+)$/", $header, $m))
                {
                    $url = $m[1];
                }

                // Use regex to detect HTTP response codes
                if (preg_match("/^HTTP.+\s(\d\d\d)\s/", $header, $m))
                {
                    $code = $m[1];
                }
            }
            // $code 404 This must be a bad video ID.
            if ($code == 404) //
            {
                $is_valid = false;
            }
        }
        return $is_valid;
    }

// https://www.youtube.com/watch?v=9fYhJzEqrns

    // $id = '9fYhJzEqrns'; //Video id goes here
    // if (YouTube_Check_ID($id))
    // {
        // echo "Yes! The video exists";
    // }
    // else
    // {
        // echo "Oh, no! The video code is wrong and it can't be found on YouTube";
    // }