On Fri, May 2, 2008 at 1:09 PM, Philip Thompson <philthathril@xxxxxxxxx>
wrote:
> Hi all. I have several classes. Within each class, a new class is called.
> Is there a way to assign a function in a *deeper* class to be called in the
> first class? Example to follow......
>
> <?php
> class A {
> function __construct () {
> $this->b = new B ();
> // I want to do the following. This does not work, of course.
> $this->doSomething = $this->b->c->doSomething;
> }
> }
>
> class B {
> function __construct () {
> $this->c = new C ();
> }
> }
>
> class C {
> function __construct () { }
> function doSomething () { echo "¡Hi!"; }
> }
>
> $a = new A ();
> // Instead of doing this,
> $a->b->c->doSomething();
>
> // I want to do this.
> $a->doSomething(); // ¡Hi!
> ?>
>
> Basically, it's just to shorten the line to access a particular function.
> But, is it possible?!
i cant remember what the term is for it phillip (ill look later), but thats
sort of considered a bad practice.. primarily since c is composed by b and
a doesnt really know about it, then the way a should talk to c is through
b. so i would create a wrapper method in b (you have many implementation
options here) as a simple example something like this
class B {
//...
function doSomething() {
return $this->c->doSomething();
}
}
which allows you this in A instances
$this->b->doSomething();
this is the preferred approach, since A and C instances are loosely coupled.
of course, if you wanted a to 'know' about c then you could do something
like this,
class B {
// ..
function getC() {
return $this->c;
}
}
giving you the ability to do this in A instances
$this->b->getC()->doSomething();
of course now A's knows about C's and your system is more tightly coupled.
-nathan
