无法访问 __callStatic 内部的超级全局变量? [英] Can't Access Super Globals Inside __callStatic?

问题描述

以下代码在我安装 PHP 5.3.6-13ubuntu3.2 时失败，这让我想知道为什么我无法在此方法中访问 $_SERVER Super Global.

The following code fails on my install of PHP 5.3.6-13ubuntu3.2 which makes me wonder why I can't access the $_SERVER Super Global inside this method.

<?php

header('Content-Type: text/plain');

$method = '_SERVER';
var_dump($$method); // Works fine

class i
{
    public static function __callStatic($method, $args)
    {
        $method = '_SERVER';
        var_dump($$method); // Notice: Undefined variable: _SERVER
    }
}

i::method();

有人知道这里出了什么问题吗?

Anyone know what is wrong here?

推荐答案

如手册所示:

Note: Variable variables

Superglobals cannot be used as variable variables inside functions or class methods. 

(参考)

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