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class A extemds F{

public __construct(){
    parent::test();   

  }

}

class B extends A{
    public __construct(){
      $this->test(); 

    }

}

class C {
  public __construct(){
      var D= new B() // Õâʱtest()Ò²¾ÍÊÇ class FÀï·½·¨Ö´Ðзñ£¿

    }

}

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PHP code <?phpclass Base {function test() {echo__METHOD__,PHP_EOL;
    }
}class Level_1extends Base{publicfunction __construct(){echo"Level 1 >>";
        parent::test();
    }
}class Level_2extends Level_1{publicfunction __construct(){echo"Level 2 >>"; <