php 静态绑定之static::

对于静态绑定中的static::在此不多做解释,我想用实例来证明,这个例子是来自官方文档：

For example one：

class A{   private function foo(){       echo "this is a test function"."<br>";   }   public function test(){       $this->foo();       static::foo();   }}$A=new A();$A->test();

输出结果：
this is a test function
this is a test function

For example Two:

class A{   private function foo(){       echo "this is a test function"."<br>";   }   public function test(){       $this->foo();       static::foo();   }}class B extends A{}$B=new B();$B->test();

输出结果：
this is a test function
this is a test function

For example three：

class A{   private function foo(){       echo "this is a test function"."<br>";   }   public function test(){       $this->foo();       static::foo();   }}class B extends A{}class C extends A{   private function foo(){   }    } $C=new C();$C->test();

输出结果：
this is a test function
( ! ) Fatal error: Call to private method C::foo() from context ‘A’ in D:\www\testXdebug\index.php on line 21
Call Stack
Time Memory Function Location
1 0.0156 135536 {main}( ) …\index.php:0
2 0.0156 135936 A->test( ) …\index.php:35

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