Late static binding static

1. Let me talk about __CLASS __, get_class (), get_called_class () the difference:

   __CLASS__ Gets the current class name,

   get_class () above, are to get the current class name,

   get_called_class () Gets the class name of the current main theme of the class.
   Reference program:

   

   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(); //The method parent :: members call the parent class defined 
           echo ' B Called by IS ' .__ class__. ' a ' ; 
           echo ' B Called by IS ' .get_class (). ' a ' ; 
           echo ' B Called by IS ' . .get_called_class () ' a ' ; 
       } 
   } 
   
   $ B = new new B; 
   $ B -> say ();

   View Code

　　　　Operating results of the program are:

　　　　a is called BYA
　　　　a BYA is called
　　　　a library is called
　　　　b is called BYB
　　　　b is called BYB
　　　　b is called BYB

1. Then late static binding static presentation:
   

   <?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 functionWHO () {
            echo  __CLASS__ ; 
       } 
       public  static  function Test () {
            static :: WHO (); // late static binding from here 
       } 
   } 
   
   class B the extends A {
        public  static  function WHO () {
            echo  __CLASS__ ; 
       } 
   } 
   
   B :: Test (); 
   
   //    now output B

   View Code

    

2. Details Reference Manual