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Old 03-05-2005, 09:33 AM   #1
ldp
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OOP (PHP) classes and extended classes


Just a general question:

When I program in oop and I want to have a class user and another one which is called admin, should I use inheritance for this?

I mean: the user has certain capabilities but the admin has more (no kidding )
Is it ok to create a class "user" with a number of basic methods and then create a class "admin" which extends "user" and contains some extra methods. (it uses all the same members as the "user" class)
Or should I just create "admin" class and use an instance of the "user" class as member?

And can I use a protected member from the "user" class like this in the "admin" class: parent::variable ?? or is it $parent::variable ?? (like in $this->variable)

Thanks for any help.

regards,
Lieven

Last edited by ldp; 03-05-2005 at 10:08 AM.
 
Old 03-05-2005, 11:00 AM   #2
keefaz
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When you do something like class admin extends user {...,
if you want to access, say a $name property of user class, you just
access it with $this->name in admin class, as for any method of user
class like $this->login(), etc... The user class is extended with the
properties and methods added by admin class
 
Old 03-05-2005, 11:26 AM   #3
coolman0stress
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Quote:
Is it ok to create a class "user" with a number of basic methods and then create a class "admin" which extends "user" and contains some extra methods.
Sounds good to me. A good way to quickly determine whether to use inheritance or composition is to ask the following questions:

Is admin a user? If yes, use inheritance.
Does an admin have a user? If yes, use composition.

It's the good old "is a" vs "has a" question test.
 
Old 03-05-2005, 11:45 AM   #4
ldp
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Indeed, admin is a user.
a user is not just a part of admin.

thanks for the replies
 
  


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