Re: [PHP-DEV] More OOP

[Alexander Wirtz]

Hi Tom,

>I looked at your link "http://www.mm4.de/php4win/tips.php3?id=1" and found
>that "parent::classname()" worked. But how? Usualy PHP uses a "->" like
>"$this->classname()". I've never before seen the two "::" - Can someone
>explain?

This syntax is borrowed from C++ (or Java) and is a way to access methods
of classes which have no instance. This is also called a static method.
So if you have

class myclass
{
   function myfunction()
   {
  ...
   }
}

you can access this function via "myclass::myfunction()", even if there is
no object instantiated. "parent" is a reserved word to access functions of
the superclass.

(I hope I got everything right ;-)

Regards
   Alex

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RE: [PHP-DEV] More OOP

[Cynic]

probably not documented yet

At 14:39 18.1. 2001, Sam Liddicott wrote the following:
-- 
>> see $parent
>
>I can't find reference to this on the site, although
>http://www.php.net/manual/en/ref.classobj.php seems very useful.
>
>Sam

Cynic


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Re: [PHP-DEV] More OOP

[Thomas Watson]

Hi

I looked at your link "http://www.mm4.de/php4win/tips.php3?id=1" and found
that "parent::classname()" worked. But how? Usualy PHP uses a "->" like
"$this->classname()". I've never before seen the two "::" - Can someone
explain?

- It works though... thanks :)

/watson

- Original Message -
From: "Harald Radi" <[EMAIL PROTECTED]>
To: "Sam Liddicott" <[EMAIL PROTECTED]>; "Cynic" <[EMAIL PROTECTED]>;
"Thomas Watson" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Thursday, January 18, 2001 3:05 PM
Subject: AW: [PHP-DEV] More OOP


> see http://www.mm4.de/php4win/tips.php3?id=1
>
> > -Ursprüngliche Nachricht-
> > Von: Sam Liddicott [mailto:[EMAIL PROTECTED]]
> > Gesendet: Donnerstag, 18. Jänner 2001 14:39
> > An: Cynic; Sam Liddicott; Thomas Watson; [EMAIL PROTECTED]
> > Betreff: RE: [PHP-DEV] More OOP
> >
> >
> >
> >
> > > -----Original Message-
> > > From: Cynic [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, January 18, 2001 01:41
> > > To: Sam Liddicott; Thomas Watson; [EMAIL PROTECTED]
> > > Subject: RE: [PHP-DEV] More OOP
> > >
> > >
> > > At 14:27 18.1. 2001, Sam Liddicott wrote the following:
> > > --
> > > >Sounds a good idea.  $super though is identical to $this in
> > > plain value but
> > > >has a different type.
> > > >For $super you mean $this but treated as if it were a parent
> > > class.  Maybe
> > > >this will be introduced soon.
> > >
> > > see $parent
> >
> > I can't find reference to this on the site, although
> > http://www.php.net/manual/en/ref.classobj.php seems very useful.
> >
> > Sam
> >
> >
> >
> >
> > --
> > PHP Development Mailing List <http://www.php.net/>
> > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > For additional commands, e-mail: [EMAIL PROTECTED]
> > To contact the list administrators, e-mail: [EMAIL PROTECTED]
> >
> >
>
>


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AW: [PHP-DEV] More OOP

[Harald Radi]

see http://www.mm4.de/php4win/tips.php3?id=1

> -Ursprüngliche Nachricht-
> Von: Sam Liddicott [mailto:[EMAIL PROTECTED]]
> Gesendet: Donnerstag, 18. Jänner 2001 14:39
> An: Cynic; Sam Liddicott; Thomas Watson; [EMAIL PROTECTED]
> Betreff: RE: [PHP-DEV] More OOP
>
>
>
>
> > -Original Message-
> > From: Cynic [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, January 18, 2001 01:41
> > To: Sam Liddicott; Thomas Watson; [EMAIL PROTECTED]
> > Subject: RE: [PHP-DEV] More OOP
> >
> >
> > At 14:27 18.1. 2001, Sam Liddicott wrote the following:
> > --
> > >Sounds a good idea.  $super though is identical to $this in
> > plain value but
> > >has a different type.
> > >For $super you mean $this but treated as if it were a parent
> > class.  Maybe
> > >this will be introduced soon.
> >
> > see $parent
>
> I can't find reference to this on the site, although
> http://www.php.net/manual/en/ref.classobj.php seems very useful.
>
> Sam
>
>
>
>
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> PHP Development Mailing List <http://www.php.net/>
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
> To contact the list administrators, e-mail: [EMAIL PROTECTED]
>
>


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RE: [PHP-DEV] More OOP

[Sam Liddicott]

> -Original Message-
> From: Cynic [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, January 18, 2001 01:41
> To: Sam Liddicott; Thomas Watson; [EMAIL PROTECTED]
> Subject: RE: [PHP-DEV] More OOP
> 
> 
> At 14:27 18.1. 2001, Sam Liddicott wrote the following:
> -- 
> >Sounds a good idea.  $super though is identical to $this in 
> plain value but
> >has a different type.
> >For $super you mean $this but treated as if it were a parent 
> class.  Maybe
> >this will be introduced soon.
> 
> see $parent

I can't find reference to this on the site, although
http://www.php.net/manual/en/ref.classobj.php seems very useful.

Sam




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RE: [PHP-DEV] More OOP

[Cynic]

At 14:27 18.1. 2001, Sam Liddicott wrote the following:
-- 
>Sounds a good idea.  $super though is identical to $this in plain value but
>has a different type.
>For $super you mean $this but treated as if it were a parent class.  Maybe
>this will be introduced soon.

see $parent


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RE: [PHP-DEV] More OOP

[Sam Liddicott]

> -Original Message-
> From: Thomas Watson [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, January 18, 2001 12:35
> To: [EMAIL PROTECTED]
> Subject: [PHP-DEV] More OOP
> 
> 1: If you are overriding an existing method in a class, it is then not
> possible to call the original method. Its a very basic thing 
> in OOP and
> should be possible. This is allowed in other languages such as C++ and
> Java. In Java this is done by using the super var. (In java 
> they also have
> the "this" var. The "super" var. is identical to "this" 
> whereas it just
> calls the overridden method).

Sounds a good idea.  $super though is identical to $this in plain value but
has a different type.
For $super you mean $this but treated as if it were a parent class.  Maybe
this will be introduced soon.

> 2: It would also be great if PHP supported methods with the 
> same name but
> with different arguments. I'm not sure if this is possible in 
> a language
> such as PHP, because that you don't have to assign a type 
> (int, char) to a
> variable (like you do in Java and C/C++ and most other 
> compiled languages).

As you indicate it will be difficult to do automatically, however you can do
as perl does and just analyse the arguments yourself and then call a
different internal implementation.

function foo($foo1,$foo2=FALSE) {
  if ($foo1 == "oik") return $this->_foo_1($foo1,$foo2);
  else return $this->_foo_2($foo1,$foo2,"bink");
}

You can also make use of func_get_args when writing your own dispatcher
(http://www.php.net/manual/en/function.func-get-args.php)

This would me more clear than anything you could hope to get in a type-free
language.

> 
> If you like me to explain my questions more in depth then just reply.
> 
> /watson
> 
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[PHP-DEV] More OOP

[Thomas Watson]

Hi

I'm writing to the PHP Development mailing list because I have some
questions and I don't know of any other place to ask. Pleaze correct me if
I'm wrong, but you are the guys with the code, so you should be the people
to consult. So here it goes: I think that there are to basic flaws with the
PHP we have today (they are both about the OOP part of PHP):

1: If you are overriding an existing method in a class, it is then not
possible to call the original method. Its a very basic thing in OOP and
should be possible. This is allowed in other languages such as C++ and
Java. In Java this is done by using the super var. (In java they also have
the "this" var. The "super" var. is identical to "this" whereas it just
calls the overridden method).

2: It would also be great if PHP supported methods with the same name but
with different arguments. I'm not sure if this is possible in a language
such as PHP, because that you don't have to assign a type (int, char) to a
variable (like you do in Java and C/C++ and most other compiled languages).

If you like me to explain my questions more in depth then just reply.

/watson

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