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Date: Wed, 2 Aug 2006 08:36:48 +0200
Message-ID: <EDB0F034E395BF4284D66D1FD59EBFDD745CE7@sky.stade.topconcepts.net>
Thread-Topic: [PHP-DEV] RfC: rethink OO inheritance strictness
Thread-Index: Aca1m6u+/xyuaGJJSZGUPeVK6Mq/dwAXjpigAAClrKA=
To: "PHP Developers Mailing List" <internals@lists.php.net>
Subject: RE: [PHP-DEV] RfC: rethink OO inheritance strictness
From: ruempler@topconcepts.com ("Soenke Ruempler")

Hi,

just forwarding this (with some little correction in the sample code) to
the dev list as the discussion seems not to be finished ;)

The only thing I don't like is the BC breakage from 5.1 =3D> 5.2. Maybe =
an
idea of a strict mode like Lukas mentioned is some alternative.

Richard Lynch <mailto:ceo@l-i-e.com> wrote on Tuesday, August 01, 2006
8:52 PM:

> On Fri, July 21, 2006 6:05 am, Soenke Ruempler wrote:
>> So maybe from your POV it's two different methods (and yes, it IS
>> *technically*). But from OOP and API design view it is polymorphism
>> and consistency, if I didn't failed all OOP lessons and design
>> pattern books ;)
>=20
> Errrr.  Isn't that what an interface is supposed to be for?...

For object aggregation it is - yes.

> To define a "pattern" which implementations much adhere to?

Checkout the template method pattern.

Or in general, hooks for subclasses:

class A {

	public function doSomething() {
		$this->someHook('blah');
	}

	protected function someHook($someString) { // Empty hook
	}
}

class B extends A {
	protected function someHook($someString) {
		echo $someString;
	}
}

$c =3D new B;
$c->doSomething();

Now A relies on B's correct definition of method someHook().

> Why are you cramming that into a class definition, when no other
> language does that?=20

Other languages have parameter polymorphism where you can declare the
same method several times with different parameters. PHP doesn't.

-soenke