php 类的静态变量的初始化
共有的成员还有办法解决，例如：
class A {
static public $child;
}
A::$child = new B();
对于私有的成员似乎就没有什么干净的方法了，只能这样做：
class A {
static private $child;
static public initialize() {
self::$child = new B();
}
}
A::initialize();
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