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Subject: Fun with interfaces (Iterator fun)
From: php@hristov.com (Andrey Hristov)

Hi internals,
here goes some interface fun :
class FubarOK has no problem implementing Iterator. interface NewIterator just
extends Iterator and adds nothing, and here comes the fun - an error message
when FubarProblem tries to implement NewIterator.
Code :

<?php
class FubarOk implements Iterator {
	public function next(){}
	public function key(){}
	public function current(){}
	public function hasMore(){}
	public function rewind(){}
}

interface NewIterator extends Iterator {

}

class FubarProblem implements NewIterator {
	public function next(){}
	public function key(){}
	public function current(){}
	public function hasMore(){}
	public function rewind(){}
}
?>

Output :
PHP Fatal error:  Class FubarProblem must implement interface Traversable as
part of either Iterator or IteratorAggregate in Unknown on line 0

regards,
Andrey