EtherpadLite\Client::call PHP Метод

    protected function call($function, array $arguments = array(), $method = 'GET')
    {
        $arguments['apikey'] = $this->apiKey;
        $arguments = array_map(array($this, 'convertBools'), $arguments);
        $arguments = http_build_query($arguments, '', '&');
        $url = $this->baseUrl . "/" . self::API_VERSION . "/" . $function;
        if ($method !== 'POST') {
            $url .= "?" . $arguments;
        }
        // use curl of it's available
        if (function_exists('curl_init')) {
            $c = curl_init($url);
            curl_setopt($c, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($c, CURLOPT_TIMEOUT, 20);
            if ($method === 'POST') {
                curl_setopt($c, CURLOPT_POST, true);
                curl_setopt($c, CURLOPT_POSTFIELDS, $arguments);
            }
            $result = curl_exec($c);
            curl_close($c);
            // fallback to plain php
        } else {
            $params = array('http' => array('method' => $method, 'ignore_errors' => true, 'header' => 'Content-Type:application/x-www-form-urlencoded'));
            if ($method === 'POST') {
                $params['http']['content'] = $arguments;
            }
            $context = stream_context_create($params);
            $fp = fopen($url, 'rb', false, $context);
            $result = $fp ? stream_get_contents($fp) : null;
        }
        if (!$result) {
            throw new \UnexpectedValueException("Empty or No Response from the server");
        }
        $result = json_decode($result);
        if ($result === null) {
            throw new \UnexpectedValueException("JSON response could not be decoded");
        }
        return $this->handleResult($result);
    }