ActiveResource\ActiveResource::_fetch PHP Метод

    public function _fetch($url, $method, $params)
    {
        if (!extension_loaded('curl')) {
            $this->error = 'cURL extension not loaded.';
            return false;
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_MAXREDIRS, 3);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_VERBOSE, 0);
        curl_setopt($ch, CURLOPT_HEADER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        /* HTTP Basic Authentication */
        if ($this->user && $this->password) {
            curl_setopt($ch, CURLOPT_USERPWD, $this->user . ":" . $this->password);
        }
        if ($this->request_format == 'xml') {
            $this->request_headers = array_merge($this->request_headers, array("Expect:", "Content-Type: text/xml", "Length: " . strlen($params)));
        }
        switch ($method) {
            case 'POST':
                curl_setopt($ch, CURLOPT_POST, 1);
                curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
                break;
            case 'DELETE':
                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
                break;
            case 'PUT':
                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
                curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
                break;
            case 'GET':
            default:
                break;
        }
        if (count($this->request_headers)) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, $this->request_headers);
        }
        $res = curl_exec($ch);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        // Check HTTP status code for denied access
        if ($http_code == 401) {
            $this->errno = $http_code;
            $this->error = "HTTP Basic: Access denied.";
            curl_close($ch);
            return false;
        }
        // Check HTTP status code for rate limit
        if ($http_code == 429) {
            if (preg_match('/Retry-After: ([0-9]+)/', $res, $retry_after)) {
                sleep(intval($retry_after[1]));
                return $this->_fetch($url, $method, $params);
            }
            $this->errno = $http_code;
            $this->error = "Too Many Requests";
            curl_close($ch);
            return false;
        }
        if (!$res) {
            $this->errno = curl_errno($ch);
            $this->error = curl_error($ch);
            curl_close($ch);
            return false;
        }
        curl_close($ch);
        return $res;
    }