Re: Polymorphism in PHP
| From: | Richard Fox | Date: | Mon, 18 Feb 2002 20:12:34 +0000 |
| Subject: | Re: Polymorphism in PHP | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-85265@lists.php.net to get a copy of this message | ||
That's right, the difference between C++ "pure virtual" and "virtual" is
that a virtual function has an implementation but pure virtual only defines
an interface.
But can we get back to my original PHP question: Can I do something like the
following in php:
class Base {
function Foo() { echo "Base"; }
}
class Derived1 extends Base {
function Foo() { echo "Derived1"; }
}
class Derived2 extends Base {
function Foo() { echo "Derived2"; }
}
function Example ( $objvar ) {
$objvar->Foo();
}
...
$obj1 = new Base();
$obj2 = new Derived1();
$obj3 = new Derived2();
Example($obj1);
Example($obj2);
Example($obj3);
I think what I am asking is, is there any concept of a virtual function in
PHP, with a virtual function table?
Rich
-----Original Message-----
From: Martin Towell [mailto:martin.towell@world.net]
Sent: Sunday, February 17, 2002 5:31 PM
To: php-general@lists.php.net
Subject: RE: [PHP] Polymorphism question
A bit late in replying - but what the hay (or is that "hey"??) oh well...
>From my understanding of virtual functions (and it's been at least 3 to 4
years since I've done C++) is that a "virtual function" has basic
functionality and a "pure virtual function" has no, and can't have, and
code.
Please correct me if I'm wrong
Martin