Torrent::scrape PHP Method

    public function scrape($announce = null, $hash_info = null, $timeout = self::timeout)
    {
        $packed_hash = urlencode(pack('H*', $hash_info ? $hash_info : $this->hash_info()));
        $handles = $scrape = array();
        if (!function_exists('curl_multi_init')) {
            return self::set_error(new Exception('Install CURL with "curl_multi_init" enabled'));
        }
        $curl = curl_multi_init();
        foreach ((array) ($announce ? $announce : $this->announce()) as $tier) {
            foreach ((array) $tier as $tracker) {
                $tracker = str_ireplace(array('udp://', '/announce', ':80/'), array('http://', '/scrape', '/'), $tracker);
                if (isset($handles[$tracker])) {
                    continue;
                }
                $handles[$tracker] = curl_init($tracker . '?info_hash=' . $packed_hash);
                curl_setopt($handles[$tracker], CURLOPT_RETURNTRANSFER, true);
                curl_setopt($handles[$tracker], CURLOPT_TIMEOUT, $timeout);
                curl_multi_add_handle($curl, $handles[$tracker]);
            }
        }
        do {
            while (($state = curl_multi_exec($curl, $running)) == CURLM_CALL_MULTI_PERFORM) {
            }
            if ($state != CURLM_OK) {
                continue;
            }
            while ($done = curl_multi_info_read($curl)) {
                $info = curl_getinfo($done['handle']);
                $tracker = explode('?', $info['url'], 2);
                $tracker = array_shift($tracker);
                if (empty($info['http_code'])) {
                    $scrape[$tracker] = self::set_error(new Exception('Tracker request timeout (' . $timeout . 's)'), true);
                    continue;
                } elseif ($info['http_code'] != 200) {
                    $scrape[$tracker] = self::set_error(new Exception('Tracker request failed (' . $info['http_code'] . ' code)'), true);
                    continue;
                }
                $data = curl_multi_getcontent($done['handle']);
                $stats = self::decode_data($data);
                curl_multi_remove_handle($curl, $done['handle']);
                $scrape[$tracker] = empty($stats['files']) ? self::set_error(new Exception('Empty scrape data'), true) : array_shift($stats['files']) + (empty($stats['flags']) ? array() : $stats['flags']);
            }
        } while ($running);
        curl_multi_close($curl);
        return $scrape;
    }

require_once 'Torrent.class.php';
// create torrent
$torrent = new Torrent('./torrents', 'http://torrent.tracker/annonce');
if (!($error = $torrent->error())) {
    $torrent->save('test.torrent');
    // save to disk
} else {
    echo '<br>DEBUG: ', $error;
    // error method return the last error message
}
// print torrent info
$torrent = new Torrent('./test.torrent');
echo '<pre>private: ', $torrent->is_private() ? 'yes' : 'no', '<br>annonce: ';
var_dump($torrent->announce());
echo '<br>name: ', $torrent->name(), '<br>comment: ', $torrent->comment(), '<br>piece_length: ', $torrent->piece_length(), '<br>size: ', $torrent->size(2), '<br>hash info: ', $torrent->hash_info(), '<br>stats: ';
var_dump($torrent->scrape());
echo '<br>content: ';
var_dump($torrent->content());
echo '<br>source: ', $torrent;
// modify torrent
$torrent->announce('http://alternate-torrent.tracker/annonce');
// add a tracker
$torrent->announce(false);
// reset announce trackers
$torrent->announce(array('http://torrent.tracker/annonce', 'http://alternate-torrent.tracker/annonce'));
// set tracker(s), it also works with a 'one tracker' array...
$torrent->announce(array(array('http://torrent.tracker/annonce', 'http://alternate-torrent.tracker/annonce'), 'http://another-torrent.tracker/annonce'));
// set tiered trackers
$torrent->comment('hello world');
$torrent->name('test torrent');
$torrent->is_private(true);