PhpSandbox\PHPSandbox::_print_r PHP Method

    public function _print_r()
    {
        $arguments = func_get_args();
        foreach ($arguments as $index => $value) {
            if ($value instanceof self) {
                unset($arguments[$index]);
                //hide PHPSandbox variable
            } else {
                if ($value instanceof SandboxedString) {
                    $arguments[$index] = strval($value);
                }
            }
        }
        return call_user_func_array('print_r', $arguments);
    }