', base64_encode(ob_get_clean())); } private static function saveResult($num1, $num2, $op){ $result = 0; if($op == '-') $result = $num1 - $num2; if($op == '+') $result = $num1 + $num2; if($op == '*') $result = $num1 * $num2; Session::set('__wpdm_simplemath_result', $result); } }