<?php class DataContainer implements IteratorAggregate { public $data; public function __construct(array $data) { $this->data = $data; } public function getIterator() { foreach ($this->data as $key => $value) { yield $key => $value; } } } $dataContainer = new DataContainer([1, 2, 3]); foreach ($dataContainer as $key => $value) { $value *= -1; $value->data[$key] = $value; } var_dump($dataContainer);
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