Re: __constructor parameter limitations.
| From: | Etienne Kneuss | Date: | Mon, 19 Sep 2011 09:17:52 +0000 |
| Subject: | Re: __constructor parameter limitations. | ||
| References: | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 | Groups: | php.internals |
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Hi,
2011/9/19 Frédéric Hardy <frederic.hardy@mageekbox.net>
> Hi !
>
> What is the utility of abstract method if implementation can not follow
> the signature (constraints ?) of the abstract method ?
>
In this case, abstract methods are totaly useless !
> Moreover, i think that it's not compatible with Liskov substitution
> principle.
Subclasses can loosen the preconditions, that's eactly what happens here and
it is perfectly fine in theory.
>
>
> Best regards,
> Fred
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Etienne Kneuss
http://www.colder.ch