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Posted by Jerry Stuckle on 08/08/06 11:35
wildernesscat@gmail.com wrote:
> Hello there,
>
> I'm looking for a method to test, whether an object has a certain
> property.
> Consider the following snippet:
>
> class A { var $aaa; }
> $var = new A;
>
> (Assuming that the structure of class A is unknown) I need a way to
> check whether $var->aaa exists (test positive), and whether $var->xxx
> exists (test negative). I tried boolean tests, isset(), is_null(), but
> they can't tell the difference.
> I guess I could convert the object to an array and test its indices,
> but that wouldn't be practical for large object with many fields.
>
> Any other ideas?
>
> Thanks in advance,
> Danny
>
Danny,
Once of the concepts of OO programming is encapsulation (not fully
implemented in PHP), in which can't access $aaa. Anything outside of
the class should not have access to the internal variables of the class;
nor should they concern themselves with the internals of the class.
This limits the effects of changes to the class.
Exactly what problem are you trying to resolve?
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
==================
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