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To: Oleg Poludnenko <oleg@poludnenko.info>
Cc: Kevin Ingwersen <ingwie2000@googlemail.com>, Nikita Popov
 <nikita.ppv@gmail.com>, PHP internals <internals@lists.php.net>
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Date: Fri, 22 Nov 2013 13:03:36 +0100
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Subject: Re: [PHP-DEV] PHP RFC: Deffering functions by arguments (count
 or/and type)
From: johannes@schlueters.de (Johannes =?ISO-8859-1?Q?Schl=FCter?=)

On Fri, 2013-11-22 at 11:54 +0200, Oleg Poludnenko wrote:
> Here there is a code sample: https://gist.github.com/uaoleg/7596995

That sample fails the Liskov substitution principle. Any instance of
figure has to have a calcPerimeter method taking zero arguments else you
can't use them interchangeably what the base class should guarantee.
http://en.wikipedia.org/wiki/Liskov_substitution_principle

johannes