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PHP延迟静态捆绑Late Static Bindings

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Release: 2016-05-19 15:12:07
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看了一下php5.3的Late Static Bindings,简单了翻译一下
Late Static Bindings是在PHP5.3中加入的新特性,拼音来说,就是把本来在定义阶段固定下来的表达式
或变量,改在执行阶段才决定,比如当一个子类继承了父类的静态表达式的时候,它的值并不能被改变,有
时不希望看到这种情况
class A {
   public static function who() {
     echo __CLASS__;
   }
   public static function test() {
     self::who();   
   }
}
class B extends A {   
   public static function who() {
     echo __CLASS__;
   }

B::test();//输入A
?>
但是现在我想让其输出B,那么使用Late Static Bindings可实现这一特性了
class A {
   public static function who() {
     echo __CLASS__;
   }
   public static function test() {
     static::who(); // Late Static Bindings  
   }
}
class B extends A {   
   public static function who() {
     echo __CLASS__;
   }

B::test();//输出B
?>
source:php.cn
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