On Fri, Apr 18, 2008 at 10:25:29AM -0600, Nathan Nobbe wrote:
> On Thu, Apr 17, 2008 at 5:43 PM, Nick Stinemates <[EMAIL PROTECTED]>
> wrote:
>
> > On Thu, Apr 17, 2008 at 10:05:11AM +0200, Michael Preminger wrote:
> > > Hello!
> > >
> > > Seems that PHP gets more and more object oriented, which is good.
> > >
> > > I am now running a course in PHP, using PHP 5, where we are going to
> > > use the *DOM* interface. I am trying to teach them good OO practices,
> > > meaning that we insistently hide properties and expose them as get or
> > > set methods.
> >
> > Get/set methods are more often than not breaking encapsulation and
> > should be avoided (unless purposefully designing Model object or
> > something similar.)
> >
>
> egh? we had a massive argument about this last year, but if u ask me data
> hiding is an integral part of encapsulation; therefore i agree w/ Michael.
>
Data Hiding IS Encapsulation.
But, you have to agree,
<?php
class Lol {
private $bar;
public function getBar() { return $bar }
public function setBar($bar) { $this->bar = $bar}
}
?>
Is no different than:
<?php
class Lol {
public $bar;
}
?>
Here's a more thought out argument from
http://www.javaworld.com/javaworld/jw-09-2003/jw-0905-toolbox.html :
> A fundamental precept of OO systems is that an object should not expose any
> of its implementation details. This way, you can change the implementation
> without changing the code that uses the object. It follows then that in OO
> systems you should avoid getter and setter functions since they mostly
> provide access to implementation details.
>
> To see why, consider that there might be 1,000 calls to a getX() method in
> your program, and each call assumes that the return value is of a particular
> type. You might store getX()'s return value in a local variable, for example,
> and that variable type must match the return-value type. If you need to
> change the way the object is implemented in such a way that the type of X
> changes, you're in deep trouble.
--
Nick Stinemates ([EMAIL PROTECTED])
http://nick.stinemates.org
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