<?php namespace itertools; function filter(\Traversable $iterator, callable $callback = null) { foreach ($iterator as $key => $val) { if (null !== $callback and $callback($val, $key)) { (yield $key => $val); } else if ($val) { (yield $key => $val); } } } $a = new \ArrayObject(["foo", "bar", 0, "baz"]); foreach (filter($a) as $val) { print_r($val); }
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