php - 如何在 OOP 中实现？

Question

// A is the core class

class A{
   public $lang;
   function sayhi($name){echo "Hi".$name;}
   function speak(){echo "Can Speak".$this->lang;}
}

class B {

  function TODO(){
       echo  " Go to work ";
  }
}

我现在这样做了:

class C extends B {

    function TODO(){
    //more implement here 

    $a = new A();// here I created an instance.
        // do  any  actions for A
    $a->sayhi("Newbie");
    }

}

但是我想让 B 类拥有 A 类的所有构造？

所以当我在 C 类上做的时候(就像这样)

class C extends B {

    function TODO(){
    //more implement here 
     // I wish I can 
       sayhi("Newbie");
    }

}

任何人都可以告诉我如何实现这一点？

Answer 1

class A{
   public $lang;
   function sayhi($name){echo "Hi".$name;}    //here you missed a semicolon
   function speak(){echo "Can Speak".$this->lang;}
}

class B extends A {

  function TODO(){
      echo  " Go to work ";
  }
}

class C extends B {

    function TODO(){
        $this->sayhi("Newbie");
    }

}