PHP5 extensions: using existing functionnames as method names

Hi,

i just was wondering how existing function names could be used as method names
in OO-Extensions for PHP5. I've looked through the SPL-source where this is done with
functions like current() and next() in the iterators, but I couldn't find a hint how to do this.

Can someone give me a little hint what is needed to do that.

you can use any function name as method name without a clash. you just
cannot use language constructs that aren't real functions like
"empty", "echo" or "require" as method names.

this question better belongs to php-general, btw.

Many thanks in advance,
Daniel