php Extends three class without interface

I have three class , called A,B,C and another class called X.

In this X class I want to access a few function from A, B and C.

I know if I want to access the function in one class, I can use:

class X extends A { ... }

Now I can access all A public functions, but now I want to access the 开发者_StackOverflow中文版B and C class functions as well.

How do I access methods from B and C from within X?

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the only way without interface is

class A extends B {}
class B extends C {}
class x extends A {}

There is no multiple inheritance in PHP

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If you're only looking to access the public functions, you might consider rethinking your architecture to use composition instead of inheritance. Tie together your three classes into one class which uses them:

class X {
  private $a, $b, $c;

  public function __construct() {
    $this->a = new A();
    $this->b = new B();
    $this->c = new C();
  }

  function do_stuff() {
    $this->a->do_a_stuff();
    $this->b->do_b_stuff();
    $this->c->do_c_stuff();
  }

}

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PHP does not support multiple inheritance. You can use Composition anyway.