<?php class DataContainer implements IteratorAggregate { protected $data; public function __construct(array $data) { $this->data = $data; } public function &getIterator() { foreach ($this->data as &$value) { yield $value; } } } $dataContainer = new DataContainer([4, 5, 6]); foreach ($dataContainer as &$value) { $value *= -1; } var_dump($dataContainer);
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