<?php // fr Nikita's RFC class DataContainer implements IteratorAggregate { protected $data; public function __construct(array $data) { $this->data = $data; } public function &getIterator() { foreach ($this->data as $key => &$value) { yield $key => $value; } } } $dataContainer = new DataContainer([1, 2, 3]); foreach (array_keys($dataContainer) as $key => $value) { $dataContainer[$key] = ($value * -1); } // $this->data is now [-1, -2, -3]
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