curl_redir_exec()函数

function curl_redir_exec($ch,$debug="")
{
    static $curl_loops = 0;
    static $curl_max_loops = 20; 

    if ($curl_loops++ >= $curl_max_loops)
    {
        $curl_loops = 0;
        return FALSE;
    }
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $data = curl_exec($ch);
    $debbbb = $data;
    list($header, $data) = explode("\n\n", $data, 2);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE); 

    if ($http_code == 301 || $http_code == 302) {
        $matches = array();
        preg_match('/Location:(.*?)\n/', $header, $matches);
        $url = @parse_url(trim(array_pop($matches)));
        //print_r($url);
        if (!$url)
        {
            //couldn't process the url to redirect to
            $curl_loops = 0;
            return $data;
        }
        $last_url = parse_url(curl_getinfo($ch, CURLINFO_EFFECTIVE_URL));
    /*    if (!$url['scheme'])
            $url['scheme'] = $last_url['scheme'];
        if (!$url['host'])
            $url['host'] = $last_url['host'];
        if (!$url['path'])
            $url['path'] = $last_url['path'];*/
        $new_url = $url['scheme'] . '://' . $url['host'] . $url['path'] . ($url['query']?'?'.$url['query']:'');
        curl_setopt($ch, CURLOPT_URL, $new_url);
    //    debug('Redirecting to', $new_url); 

        return curl_redir_exec($ch);
    } else {
        $curl_loops=0;
        return $debbbb;
    }
}