RE: [PHP] How to call a member from the base class?

[Neil Kimber]

No! This won't work. There are two ways in which you can get an overridden
method to call the method in its super-class, these are by using the
following constructs:

        1)   parent::
        2)   <classname>::

So, you could do the following:

1)
class B extends A {
    function something() {
        // some other actions
        parent::something(); // calls A::something
    }
}

or

2)
class B extends A {
    function something() {
        // some other actions
        A::something(); // calls A::something
    }
}

I've experienced PHP getting confused when using the parent:: construct. If
you have an object that is 3 levels deep in sub-classing and each sub-class
overrides the same method then the parent:: construct in the level 2 object
sometimes calls the level objects method - ad infinitum. This seems to be a
bug with the parent:: construct.

i.e.

class A{
        function foo(){
                print "A";
                }
class B extends A{
        function foo(){
                parent::foo();
                print "B";
                }
class C extends B{
        function foo(){
                parent::foo();
                print "C";
                }

$bar=new C();
$bar->foo();

// Output would be:
CBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB..............

because parent::foo() in class B incorrectly resolves to B::foo().

So, I normally use the explicit class name construct, giving:

class A{
        function foo(){
                print "A";
                }
class B extends A{
        function foo(){
                A::foo();
                print "B";
                }
class C extends B{
        function foo(){
                B::foo();
                print "C";
                }

$bar=new C();
$bar->foo();

// Output would be:
CBA


Hope this helps.

Neil

-----Original Message-----
From: Alexander Deruwe [mailto:[EMAIL PROTECTED]]On Behalf Of Alexander
Deruwe
Sent: 03 September 2001 14:51
To: A. op de Weegh; [EMAIL PROTECTED]
Subject: Re: [PHP] How to call a member from the base class?


On Monday 03 September 2001 09:47, A. op de Weegh wrote:

> How do I make sure in the something() member of class B, that the parent
> class member something() is also called? Can I do this:

Hello there, person with the same name as self, :)

class B extends A {
    function something() {
        // some other actions
        $this->something(); // calls A::something
    }
}

I've used this code for calling base class constructors. These ofcourse have
different names, while your functions are both called the same. I don't
think
that should make any difference, though.

ad.

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