Newsgroups: php.internals Path: news.php.net Xref: news.php.net php.internals:25114 Return-Path: Mailing-List: contact internals-help@lists.php.net; run by ezmlm Delivered-To: mailing list internals@lists.php.net Received: (qmail 92190 invoked by uid 1010); 2 Aug 2006 10:47:10 -0000 Delivered-To: ezmlm-scan-internals@lists.php.net Delivered-To: ezmlm-internals@lists.php.net Received: (qmail 92174 invoked from network); 2 Aug 2006 10:47:10 -0000 Received: from unknown (HELO lists.php.net) (127.0.0.1) by localhost with SMTP; 2 Aug 2006 10:47:10 -0000 X-PHP-List-Original-Sender: hartmut@php.net X-Host-Fingerprint: 213.136.52.68 mailgate-out2.mysql.com Linux 2.5 (sometimes 2.4) (4) Received: from ([213.136.52.68:58201] helo=mailgate.mysql.com) by pb1.pair.com (ecelerity 2.1.1.3 r(11751M)) with ESMTP id 10/59-45114-AFD70D44 for ; Wed, 02 Aug 2006 06:27:07 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by mailgate.mysql.com (8.13.4/8.13.4) with ESMTP id k72AQwDx027314; Wed, 2 Aug 2006 12:26:58 +0200 Received: from mail.mysql.com ([10.222.1.99]) by localhost (mailgate.mysql.com [10.222.1.98]) (amavisd-new, port 10026) with LMTP id 03207-06; Wed, 2 Aug 2006 12:26:58 +0200 (CEST) Received: from [10.100.64.53] (10-100-64-53.mysql.internal [10.100.64.53]) (authenticated bits=0) by mail.mysql.com (8.13.3/8.13.3) with ESMTP id k72AQpAZ028845 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 2 Aug 2006 12:26:53 +0200 Message-ID: <44D07DE2.9050802@php.net> Date: Wed, 02 Aug 2006 12:26:42 +0200 User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.1) Gecko/20060130 SeaMonkey/1.0 MIME-Version: 1.0 To: Stefan Walk CC: PHP Developers Mailing List References: <18810497049.20060801234124@marcus-boerger.de> <44CFDB2B.1010907@cschneid.com> <4858f9d90608020200pae76093v86f53f1627e32ba5@mail.gmail.com> In-Reply-To: <4858f9d90608020200pae76093v86f53f1627e32ba5@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-Virus-Scanned: by amavisd-new at mailgate.mysql.com Subject: Re: [PHP-DEV] RfC: rethink OO inheritance strictness From: hartmut@php.net (Hartmut Holzgraefe) Stefan Walk wrote: > For the people who have said "I can not understand why this is a bad=20 > thing": >=20 > http://en.wikipedia.org/wiki/Liskov_substitution_principle so it is a bad thing when aiming for substitutability, i lack to see an argument yet for substitutability being a must have in all situations (just as a normalized data model is not always the right choice in database design ... it's something to aim for but if it were enforced this would be BAD THING(tm)) --=20 Hartmut Holzgraefe, Senior Support Engineer . Hauptsitz: MySQL GmbH, Radlkoferstr. 2, D-81373 M=FCnchen Gesch=E4ftsf=FChrer: Hans von Bell, Kaj Arn=F6 - HRB M=FCnchen 162140