Built-in Interface to rewrite empty() ?

[Norbert Wenzel <mail@xxxxxxxxxxxx>]

Hi,

I think I once knew a PHP5 interface, which forces a class to implement 
a function empty(). If an object $myObject implements this interface, it 
should be possible to call empty($myObject) as it seems to work with the 
interface "Countable", which does the same for count().

The problem is I didn't find such an interface in any doc I found so 
far. Does anyone of you know such an interface, or did it ever exist?

thanks,
Norbert

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