PHP 静态成员不保值 [英] PHP static member not holding value

问题描述

我正在编写的 WordPress 插件有一个奇怪的问题，但这与 WordPress 本身无关，更多与 PHP 相关，所以请继续阅读，以便我解释.连接了 WordPress 插件，以便调用 init() 函数......这有效，我可以确认它被调用一次.

Hi i have a strange problem with a WordPress plugin that i am writing, but this isnt about WordPress per se and more to do with PHP so please read on so I can explain. The WordPress plugin is hooked up so that the init() function gets called... this works i can confirm it gets called once.

class MyClass
{
   static $i=0;

   public static function init()
   {
     self::$i++;
   }

   public static function dosomething()
   {
     echo 'i is = ' . self::$i;
   }
}

当第一次从 Wordpress 中调用 inf dosomething() 时是可以的.然后我有另一个 ajax-response.php 文件，其中包含上述类并再次调用 dosomething，它打印 i 值 = 1.

When callinf dosomething() for the first time from within Wordpress it is ok. I then have another ajax-response.php file which includes the above class and again calls dosomething, which prints the i value = 1.

问题是通过ajax-response.php脚本调用时i值回0了吗?

The problem is the i value when calling via the ajax-response.php script is back to 0?

就好像它在一个完全不同的内存空间中执行并创建一个新程序，这样静态成员变量只在同一个进程之间共享，而不是在多个 Web 线程之间共享.

Its as if it is executing in a totally different memory space and creating a new program, such that static member variables are only shared between same process as opposed to multiple web threads.

有什么想法吗?

提前致谢，

克里斯

推荐答案

就好像它在一个完全不同的内存空间中执行并创建一个新程序，这样静态成员变量只在同一个进程之间共享，而不是在多个 Web 线程之间共享.`

Its as if it is executing in a totally different memory space and creating a new program, such that static member variables are only shared between same process as opposed to multiple web threads.`

没错！:) 这是 100% 的工作原理.每个 PHP 请求都是一个新的请求，有自己的内存.static 关键字不是用来解决这个问题的.

Exactly! :) That's 100% how this works. Each PHP request is a new one, with its own memory. The static keyword is not designed to work around that.

如果你想在一个 web 应用程序中跨多个进程/请求持久化东西，你需要使用 会话.

If you want to persist stuff across multiple processes / requests in a web application, you need to use sessions.

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