<?php class A implements IteratorAggregate { public $b; public function __construct(B $b) { $this->b = $b; } public function getIterator() { return $b; } } class B implements IteratorAggregate { public function getIterator() { for ($i = 0; $i < 5; $i++) { yield $i => $i; } } } $a = new A(new B); foreach ($a as $key => $value) { var_dump($key, $value); }
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