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php 静态变量的初始化_php技巧

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WBOYOriginal
2016-05-17 09:29:231012browse

例如:
class A {
public $f1 = 'xxxx';
static public $f2 = 100;
}


如果要将变量赋值为对象,那么只能在构造器中进行初始化,例如:
class A {
private $child;
public function __construct() {
$this->child = new B();
}
}


但是php中并没有一个类似java中的静态构造器/静态块的东西,就没有合适的时机对其进行初始化了。


对于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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