Unusual OO behavior?

here is some php code:

class A {
  private function action(){
    echo 1;
  }
  public static function callAction(A $a){
    $a->action();
  }
}

$a = new A;
A::callAction($a);

can someone explain开发者_如何转开发 me why does object method is vissible from static method context how does following code works in other languages ???

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The keyword private means the function is accessible from within this class only, not from within this object. The behaviour is the same in all languages I know.

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As your $a object is passed as a parameter in A::callAction(), you can call any of its methods, static or not.

And as in A::callAction(A) you are in the implementation of A class, you can call $a->action.

Simple ? =)