<?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; } } } $dataContainer = new DataContainer([77, 78, 79]); var_dump($dataContainer); foreach ($dataContainer as &$value) { $value *= -1; } var_dump($dataContainer,$value); // -77,-78,&int-79 // Must unset $value ... foreach($dataContainer as $value); var_dump($dataContainer);// -77,-78,&int-78
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