<?php class foo implements IteratorAggregate { public function getIterator(){ return new class implements IteratorAggregate{ public function getIterator(){ yield from [1, 2, 3]; } }; } } function iterator(Iterable $iterable): Iterator{ return $iterable instanceof Iterator ? $iterable : iterator($iterable->getIterator()); } $foo = new foo; $iterator = iterator($foo->getIterator()); foreach($iterator as $a) echo $a;
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