全局与PHP中的静态变量 [英] Global vs static variables in PHP

问题描述

我正在用PHP创建一个基本框架。我需要将当前页面的数据传递给不同的功能，允许他们修改并保存它，然后将其传回到要显示的页面。我原本计划将数据存储在像 $ GLOBALS ['data'] 这样的全局变量中，但我开始认为使用全局变量是一个坏主意。所以我在想，相反，我会在系统类中放入一个静态变量，并使用 system :: $ data 来访问它。所以，我的问题是，哪个更好，为什么？

这个：

  $ GLOBALS ['data'] = array（）; 
 $ GLOBALS ['data'] ['page_title'] ='家'; 
 echo $ GLOBALS ['data'] ['page_title']; 
  

或者：

 类系统
 {
 public static $ data = array（）
} 
 
函数数据（$ new_var）
 {
 system :: $ data = array_merge（system :: $ data，$ new_var）; 
 
 
 data（array（'page_title'=>'Home'））; 
 echo system :: $ data ['page_title']; 
  

解决方案

全局变量和 public static 变量。类变量命名空间好一点点，但这几乎没有什么区别。在任何时候任何地方都可以访问这两者，并且都是全球性的。

碰巧，我刚写了一篇关于这个主题的详尽文章：

< a href =http://kunststube.net/static/ =noreferrer>如何不使用Statics杀死你的测试性能

I'm creating a basic framework in PHP. I need to pass data for the current page into different functions, allow them to modify and save it, and then pass it back to the page to be displayed. I was originally planning on storing the data in a global variable like $GLOBALS['data'], but I'm starting to think that using a global is a bad idea. So I'm thinking that instead I will put a static variable in the system class, and access it using system::$data. So, my question is, which would be better and why?

This:

$GLOBALS['data'] = array();
$GLOBALS['data']['page_title'] = 'Home';
echo $GLOBALS['data']['page_title'];

Or this:

class system
{
    public static $data = array()
}

function data($new_var)
{
    system::$data = array_merge(system::$data, $new_var);
}

data(array('page_title' => 'Home'));
echo system::$data['page_title'];

解决方案

There really is no difference between a global variable and a public static variable. The class variable is namespaced a tiny bit better, but that hardly makes any difference. Both are accessible anywhere at any time and both are global state.

As it happens, I just wrote an exhaustive article on the subject:
How Not To Kill Your Testability Using Statics

这篇关于全局与PHP中的静态变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！