Writing the code of class outside

[saedm]

Greetings,

 

Is there a way to write a code of function that belongs to a class outside the class , e.g. in c++ it looks likes this:

 

class C

{

public:

  void func();

}

 

C::func()

{

  //code

}

[corbin]

Not possible in PHP.  Why would you want to do that?

[saedm]

It's more elegant... the class body is the interface and outside is the implementation of the class methods

[corbin]

Oh....  You could use an interface then ;p.

 

 

Look into interfaces and implementation (obviously not new concepts to you).

 

 

It would go like:

 

interface a {

    public function b($someinput);

}

 

class a implements a {

    public function b($someinput) {

        //actually do something

    }

}

[saedm]

Ah thanks a lot !! I was almost disappointed from PHP not to have such a feature. Is this the common way to implement methods outside the class? Or professionals just type them in the class itself.

 

There's another reason for this than elegancy, in C++ if you implement the method inside a class it's an inline function and outside the class it's not inline (don't know if such a concept is in PHP at all)

[Mchl]

I think there's no such distinction (inline vs. non-inline) functions in PHP.

 

Details od PHP Object Model are in the manual. Note that this points you to the object model as implemented on PHP 5 and higher. The one that was in use in PHP 4 wasn't quite... mature...

[alexweber15]

Ah thanks a lot !! I was almost disappointed from PHP not to have such a feature. Is this the common way to implement methods outside the class? Or professionals just type them in the class itself.

 

There's another reason for this than elegancy, in C++ if you implement the method inside a class it's an inline function and outside the class it's not inline (don't know if such a concept is in PHP at all)

 

as far as i know there's no such concept in PHP... C++ is kinda weird in that sense having stuff like multiple inheritance that almost no other languages have...

 

in PHP you can have similar functionality using interfaces and/or abstract classes, the key difference being that in an interface you can only specify method signatures and you implement it and in an abstract class you can specify properties (variables) and also actually have full method bodies that you can either overload or just use as is without defining it in a subclass that extends the abstract class.

in both cases you can't instantiate them directly though.