note 102803 added to language.oop5.interfaces

To thanhn2001 at gmail dot com :

Neither a bug nor a feature, it is because of the main functionality of interfaces. If you inherits a class B to a A, with A which implements an interface iInterface, B is not implementing it.

For example:
<?php
  interface iMy {
    public function king();
  }

  class A implements iMy {
    public function king() {  } // otherwise, Fatal Error
  }

  class B extends A { } // no Fatal Error
?>

But if you explicitely ask an implement of iMy in B...

<?php
  interface iMy {
    public function king();
  }

  class A implements iMy {
    public function king() {  } // otherwise, Fatal Error
  }

  class B extends A implements iMy { } // Fatal Error
?>

So, in your case, there is no "overwrite".
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Manual Page -- http://www.php.net/manual/en/language.oop5.interfaces.php
Edit        -- https://master.php.net/note/edit/102803
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