运算符（操作数？）作为参数 [英] Operators (operands?) as Parameters

问题描述

基本上..

  $ op = $ _POST ['operator']; 
 $ x = 5; 
 $ y = 2; 
 $ result = $ x / * $ op而不是'+'/' - '/'*'/'/'/'％'* / $ y; 
  

这是可能的还是将我作为一个字符串发送给操作符并且复制每个操作符类型的代码？

解决方案

  $ x = 5; 
 $ y = 2; 
 $ b switch（$ _ POST ['operator']）{
 case'+'：
 $ result = $ x + $ y; 
休息; 
 case' - '：
 $ result = $ x  -  $ y; 
休息; 
 case'*'：
 $ result = $ x * $ y; 
休息; 
 case'/'：
 $ result = $ x / $ y; 
休息; 
 case'％'：
 $ result = $ x％$ y; 
休息; 
默认值：
 $ result ='不支持的操作符'; 
} 
  

这些行是。

I am trying to avoid duplicating my code by checking the variable if it is a certain operator.

Basically..

$op = $_POST['operator'];
$x = 5;
$y = 2;
$result = $x /* $op instead of '+'/'-'/'*'/'/'/'%' */ $y;

Is this possible or will I have to send the operator as a String and duplicate the code per operator type?

解决方案

It's a lot safer to do something like this:

$x = 5;
$y = 2;

switch($_POST['operator']){
    case '+':
        $result = $x + $y;
        break;
    case '-':
        $result = $x - $y;
        break;
    case '*':
        $result = $x*$y;
        break;
    case '/':
        $result = $x/$y;
        break;
    case '%':
        $result = $x % $y;
        break;
     default:
        $result = 'Operator not supported';
}

Something along those lines.

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