给操作员设置一个变量然后执行它 [英] Setting a variable to an operator then executing it

问题描述

一般来说，我是PHP的新手。我一直在搞这个代码，直到我想在一个集合中执行这个函数，而不必设置和添加sub，div，mult函数。

伪代码示例：

 <？php 
 $ Num1 = 10; 
 $ Num2 = 5; 
 $ operation = /; 
 $ Sum = $ Num1 $ operation $ Num2; 
返回$ Sum; 
  

或者类似：

 <？php 
 //创建类Math
 class math {
 //执行函数
 function exec（$ info = array（ ））{
 return $ info ['num1'] $ info ['operation'] $ info ['num2']; 
 
 
 
 //设置信息
 $信息=数组（
'num1'=> 10，
'num2' => 5，
'operation'=>'/'
）; 
 
 //执行OOP 
 $ math = new math; 
 echo $ math-> exec（$ info）; 
  

解决方案

你所要求的是< a href =http://en.wikipedia.org/wiki/Strategy_pattern =nofollow>战略模式。

一种方法这是为了定义你的函数
$ b $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $返回$操作数0 * $操作数;
};

$ add = function（$ operand0，$ operand1）{
return $ operand0 + $ operand1;
};

然后使用您的示例代码：

<$ p
$ {
//执行函数
function exec（$ info = array（））{
return $ info ['operation']（$ info ['num1']，$ info ['num2']）;



//设置信息
$信息=数组（
'num1'=> 10，
'num2' => 5，
'operation'=> $ add
）;

//执行OOP
$ math = new math;
echo $ math-> exec（$ info）; //将打印15

I'm new to PHP in general. I was messing with this code until I wanted to execute the function in one set instead of having to set and add, sub, div, mult function. How do I go about setting the variable operator with the two num sets?

Example pseudo code:

<?php
$Num1 = 10;
$Num2 = 5;
$operation = /;
$Sum = $Num1 $operation $Num2;
return $Sum;

Or something like:

<?php
// creating Class "Math"
class math {
    //Executing the function
    function exec($info = array()) {
      return $info['num1'] $info['operation'] $info['num2'];
    }
}

// Set info
$info = array(
    'num1' => 10,
    'num2' => 5,
    'operation' => '/'
);

//execute the OOP
$math = new math;
echo $math->exec($info);

解决方案

What you are asking for is referred to as the Strategy Pattern.

One way to do this is to define your functions

$multiply = function($operand0, $operand1) {
    return $operand0*$operand1;
};

$add = function($operand0, $operand1) {
    return $operand0+$operand1;
};

Then using your sample code:

class math {
    //Executing the function
    function exec($info = array()) {
      return $info['operation']($info['num1'], $info['num2']);
    }
}

// Set info
$info = array(
    'num1' => 10,
    'num2' => 5,
    'operation' => $add
);

//execute the OOP
$math = new math;
echo $math->exec($info); //will print 15

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