HttpRequestService::create_post_body PHP Method

    public function create_post_body($post_params)
    {
        $params = array();
        foreach ($post_params as $key => &$val) {
            if (is_array($val)) {
                $val = implode(',', $val);
            }
            $params[] = $key . '=' . urlencode($val);
        }
        return implode('&', $params);
    }