PHP嵌套静态变量访问以进行依赖注入 [英] PHP Nested Static Variable Access for Dependency Injection

问题描述

我想使用此模式在代码中启用依赖项注入。
我觉得它与动态语言的play-doh性质保持一致[1]。

I would like to use this pattern to enable dependency injection in my code. I feel that it keeps with the play-doh nature of dynamic languages [1].

class A {
  static $FOO = 'Foo';
  function __construct() {
    $this->foo = self::$FOO::getInstance();
  }
}

A::$FOO = 'MockFoo';
$a = new A();

不幸的是，这不起作用，我得到了：

Unfortunately, this doesn't work and I get:

Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM in [test.php] on line 6

我可以创建一个临时变量来欺骗解析器，但是还有另一种方法吗？

I can create a temporary variable to trick the parser, but is there another way?

function __construct() {
  $FOO = self::$FOO;                                                                                                                                            
  $this->foo = $FOO::getInstance();
}

[1] http://weblog.jamisbuck.org/2008/11/9/legos-play-doh-and-programming

推荐答案

没有其他语法可以完成此操作。您需要一个临时变量来欺骗解析器。

There is no alternative syntax to accomplish this. You need a temporary variable to trick the parser.

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