Parent Objects

[Sanders Kaufman]

Re: Parent Objects

Michael Fesser wrote:

'->' requires an instance of a class

That's where I got futzed up.
I didn't realize that was a wordy way of saying "object".
That's right, right?

[Michael Fesser]

Re: Parent Objects

..oO(Sanders Kaufman)

>Michael Fesser wrote:
>

>'->' requires an instance of a class

>
>That's where I got futzed up.
>I didn't realize that was a wordy way of saying "object".
>That's right, right?

Yep. ;)

Micha

[Sanders Kaufman]

Re: Parent Objects

Michael Fesser wrote:

An object is an incarnation of a class, which itself is more or less
just a "blueprint" for creating objects.

Man, you guys are really helping out here. I wrote "Teach
Yourself ActiveX Programming in 21 Days" about 10 years ago.

Since then, a bout with menningitis killed off a lot of what I
knew about OOP.

You're really helping me get it back.

[Rik]

Re: Parent Objects

Sanders Kaufman wrote:

Rik wrote:

>Sanders Kaufman wrote:

>

>>Where would I use "::"?

>>
>You wouldn't, as it are all objects, and not classes. You'd only
>need it if your class extended another class and you wished to call
>a parents method.
>>
>http://www.php.net/manual/en/languag...ekudotayim.php

>
OH! So if my class has a method, and then another class extends
the class and overrides(?) the method, I can call the original
method with "::"?

Yup, you've got it :-).
--
Rik Wasmus

[Rik]

Re: Parent Objects

Sanders Kaufman wrote:

Toby Inkster wrote:
>

><?php
>include "Widget.class.p hp";
>echo Widget::FOO;

>>>

>>
>Versus:
>>
><?php
>include "Widget.class.p hp";
>$my_widget = new Widget();
>echo $my_widget->FOO;

>>>

>
>
It means that I can call the CLASS method, without
instantiating(? ) an object, right?
>
Man, oh man, that could be real handy for my classes that don't
do too much stuff in the constructor!
>
Wait... I guess I shouldn't assume here. So I'll ask - when I
call a class method with "::", it won't fire up the constructor,
will it?

It won't, and furthermore, $this will not available. For most cases, you
can use self::
--
Rik Wasmus

[raghuanandy@gmail.com]

Re: Parent Objects


Sanders Kaufman wrote:

Michael Fesser wrote:

.oO(Sanders Kaufman)

I read that, but I'm still a little confused.
When I use a class's methods and such, I've been using "->".
But it seems like this "::" is used the same way.
What's the difference?

$someObject->method()
someClass::stat icMethod()

'->' requires an instance of a class, whereas '::' is used to call
static class methods or constants without having an object. Additionally
it's used to call inherited methods.

>
D'oh!
I thought I had it - but then you said something about static stuff.
And I think I'm futzed up about Object v. Class here.
>
So let's see if I've got it better this way:
>
I call my OBJECT methods with "->".
I call my CLASS methods with "::".
>
Ja?

Right
<?
class A{

public static $a = 'Hello';
public $b ='World';

public function __construct()
{
$this->b = 'Hello World';
}

public function NonStatic()
{
print "\nHere value of b is: ".$this->b;
//Static members can be accessed though within object methods
print "\nA value is: ".self::$a;
}

public static function StaticMethod()
{
print "\n A value is: ".self::$a;

//This will not work, cannot access object variables(membe rs) within
Static methods
//print "\n B value is : ".$this->b;
}
} //end class


$obj1 = new A();

A::StaticMethod ();

$obj1->NotStatic();

?>

Hope this clarifes

[Toby Inkster]

Re: Parent Objects

Sanders Kaufman wrote:

It means that I can call the CLASS method, without
instantiating(? ) an object, right?

Yep -- and that allows you to use classes as a handy substitute for
namespaces (something PHP sadly lacks right now).

--
Toby A Inkster BSc (Hons) ARCS
Contact Me ~ http://tobyinkster.co.uk/contact

[Sanders Kaufman]

Re: Parent Objects

Toby Inkster wrote:

Sanders Kaufman wrote:
>

>It means that I can call the CLASS method, without
>instantiating( ?) an object, right?

>
Yep -- and that allows you to use classes as a handy substitute for
namespaces (something PHP sadly lacks right now).

Name whatses?

[MF]

Re: Parent Objects


Sanders Kaufman wrote:

Toby Inkster wrote:

Sanders Kaufman wrote:

It means that I can call the CLASS method, without
instantiating(? ) an object, right?

Yep -- and that allows you to use classes as a handy substitute for
namespaces (something PHP sadly lacks right now).

>
Name whatses?

This site gives a good explanation of Namespaces:

http://en.wikipedia.org/wiki/Namespace_%28computer_science%29

[Sanders Kaufman]

Re: Parent Objects

MF wrote:

Sanders Kaufman wrote:

>Toby Inkster wrote:

>>Yep -- and that allows you to use classes as a handy substitute for
>>namespaces (something PHP sadly lacks right now).

>Name whatses?

This site gives a good explanation of Namespaces:
http://en.wikipedia.org/wiki/Namespa...ter_science%29

Well that explained it, but man that was some awkward language!
I seem to remember a journalism instructor telling us that it's
bad form to use a word to define itself. Now I see why!