我如何在PHP中编写修改数组的函数？ [英] How can I write in PHP a function that modifies an array?

问题描述

我想有一个将数组作为输入并更改数组值的函数（在我的例子中，数组是$ _SESSION，但我认为它并不真正）。

我该怎么做？

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已添加

听起来微不足道。但事实并非如此。我只是想为数组设置某些值。例如，我想让我的函数改变$ _SESSION ['x']和$ _SESSION ['y']。据我所知，如果我将一个数组作为参数传递，那么参数的任何更改都不会修改原始数组。例如：

  function change_array（$ x）{
 $ x [0] = 100; 
} 
 $ x = array（1,2,3）; 
 change_array（$ x）; 
  

它不会更改$ x。

< hr>

ADDED 2

为什么我的问题被低估？我认为这个问题并不是那么微不足道，尽管它很短。我也认为我提供了所有相关的细节。据我了解（感谢一个答案）它是关于通过参考。此外，我想修改$ _SEESION数组的事实使得它有点不同。

解决方案

通过引用传递

 函数changearray（& $ arr）{
 $ arr ['x' ] ='y'; 
} 
  

你可以这样称呼：

  changearray（$ _ SESSION）; 
  

I would like to have a function that takes an array as input and changes some values of the array (in my case the array is $_SESSION but I think it does not really maters).

How can I do that?

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ADDED

It sounds trivial. But it is not. I just want to set certain values to the array. For example, I want my function to change $_SESSION['x'] and $_SESSION['y']. As far as I know, if i pass an array as an argument, then any changes of the argument will not modify the original array. For example:

function change_array($x) {
   $x[0] = 100;
}
$x = array(1,2,3);
change_array($x);

It will not change the $x.

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ADDED 2

Why my question is down-voted? I think that the question is not so trivial in spite on the fact that it is short. I also think that I gave all relevant detail. As far as I realized (thanks to one answer) it is about "passing a reference". Moreover, the fact that I want to modify $_SEESION array makes it is a bit different.

解决方案

what you mean its call : Passing by Reference

its very simple like

function changearray(&$arr){
     $arr['x'] = 'y';
}

you can call this like :

changearray($_SESSION);

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