Posted by Chung Leong on 08/08/06 19:16

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?

Psst! You can use array_key_exists('aaa', $var) to test for the
existence of a property. I didn't tell you that by the way.

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