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run code in 300+ PHP versions simultaneously
<?php abstract class Foo implements Traversable { } class Bar extends Foo implements IteratorAggregate { public function getIterator() { return new ArrayIterator([1, 2, 3]); } } $b = new Bar; foreach ($b as $value) { var_dump($value); }

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34.4 ms | 402 KiB | 5 Q