indeed that page does not make it very clear,
it's the generic call_back syntax, which can be used practically everywhere a callback function is expected, the array you pass can be in the form of:
array($object, 'methodname')
or
array('classname', 'methodname')
the second version allows you to use static class methods.
I never knew about this syntax until I saw it on this newsgroup quite a few months back. Perhaps an update to the manual is in order? (Whistling and walking away...)
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