PhpTube.php

<?php

/*
 * @package PhpTube - A PHP class to get youtube download links
 * @author Abu Ashraf Masnun <mailbox@masnun.me>
 * @website http://masnun.com
 *
 */

class PhpTube
{

    /**
     * Parses the youtube URL and returns error message or array of download links
     *
     * @param  $watchUrl the URL of the Youtube video
     * @return string|array the error message or the array of download links
     */
    public function getDownloadLink($watchUrl)
    {
        //utf8 encode and convert "&"
        $html = utf8_encode($this->_getHtml($watchUrl));
        $html = str_replace("\u0026amp;", "&", $html);

        //get format url
        preg_match_all('/url_encoded_fmt_stream_map\=(.*)/', $html, $matches);
        $formatUrl = urldecode($matches[1][0]);

        //split the format url into individual urls
        $urls = preg_split('/url=/', $formatUrl);

        $videoUrls = array();

        foreach ($urls as $url)
        {

            /*
             *  Process the url and cut off the unnecessary data
             */
            $url = urldecode($url);
            $urlparts = explode(";", $url);
            $url = $urlparts[0];
            $urlparts = explode(",", $url);
            $url = $urlparts[0];

            /*
             * Process type
             */

            parse_str($url, $data);

            if (isset($data['watermark']) || empty($url))
            {
                continue;
            }
            else
            {
            
                if (!empty($data['type']) && !empty($data['quality']))
                {
                    $videoUrls[] = array("type" => $data['type'], "quality" => $data['quality'], "url" => $url);
                }
            }
        }

        return $videoUrls;
    }
    
    /**
     * Parses the YouTube URL's and return them back to the developer
     * 
     * @param  $watchUrls the URLs of the Youtube video's
     * @return array|array the error message or the array of download links
     */
    
    public function getDownloadLinks(array $watchUrls = array())
    {
        // Loops throught the url and return a array which contains all of the converted links
        
        $converted = array();
        
        foreach ($watchUrls as $watchUrl)
        {
            $converted[] = $this->getDownloadLink($watchUrl); 
        }
        
        return $converted;
    }

    /**
     * A wrapper around the cURL library to fetch the content of the url
     *
     * @throws Exception if the curl extension is not available (or loaded)
     * @param  $url the url of the page to fetch the content of
     * @return string the content of the url
     */
    private function _getHtml($url)
    {
        if (function_exists("curl_init"))
        {

            $ch = curl_init($url);
            curl_setopt($ch, CURLOPT_HEADER, 0);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            return curl_exec($ch);
        }
        else
        {
            throw new Exception("No cURL module available");
        }
    }

}