1. 先说一下__CLASS__,get_class() ,  get_called_class() 区别：

   __CLASS__获取当前的类名，

   get_class()与上面一样，都是获取当前的类名，

   get_called_class()获取当前主调类的类名。
   参考程序：

   

   class A 
   {
       public function say()
       {
           echo 'a is called by'.__CLASS__.'<br/>';
           echo 'a is called by'.get_class().'<br/>';
           echo 'a is called by'.get_called_class().'<br/>';
       }
   }
   
   class B extends A
   {
       public function say()
       {
           parent::say(); //parent::调用父类中定义的成员方法
           echo 'b is called by'.__CLASS__.'<br/>';
           echo 'b is called by'.get_class().'<br/>';
           echo 'b is called by'.get_called_class().'<br/>';
       }
   }
   
   $b = new B;
   $b->say();

   View Code

　　　　程序的运行结果是：

　　　　a is called byA
　　　　a is called byA
　　　　a is called byB
　　　　b is called byB
　　　　b is called byB
　　　　b is called byB

1. 然后是static后期静态绑定介绍：
   

   <?php
   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();
   ?>
   
   //输出 A
   
   class A {
       public static function who() {
           echo __CLASS__;
       }
       public static function test() {
           static::who(); // 后期静态绑定从这里开始
       }
   }
   
   class B extends A {
       public static function who() {
           echo __CLASS__;
       }
   }
   
   B::test();
   
   //   现在输出  B 

   View Code
2. 详细内容参考手册