-------- Original Message --------
On Fri, 2006-03-24 at 10:50, Jochem Maas wrote:
Pham Huu Le Quoc Phuc wrote:
> I want to execute polymorphism.
>
I said (a long time ago):
...BUT the OP didn't ask about polymorphism and php
doesn't support it at all anyway.
Rob replied (also quite a long time ago):
Ummm, PHP supports polymorphism.. it has at least since PHP 4.
http://whatis.techtarget.com/definition/0,,sid9_gci212803,00.html
1 and 3 in the above link are supported. Number 2 is not, however, that
PHP supports 1 - but I have never heard of dynamic typing referred to as
polymorphism.
PHP doesn't support 2 - in so far as you can't define mabny functions with
the same name (but different signatures) - this is usually referred to as
overloading. - granted we have __call() on objects/classes which allows you
to implement functionality that work like this.
is usually referred to as function/method overloading and not so often
by polymorphism. Number 3 is the most common type when discussing
polymorphism.
in php's case this comes down to the same thing as 1. - dynamic typing of
variables.
BUT there is a fourth form of polymorphism - one I would argue if the
most common form when speaking about polymorphism with respect to programming,
namely the ability to derive a subclass from more than one base class (simutaneously),
this is something that php cannot do (thank <deity>).
Cheers,
Rob.
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