Online PHP editor | refs for 4Dt0T

<?php class DataContainer implements IteratorAggregate { // create an external Iterator: protected $data; public function __construct(array $data) { $this->data = $data; } public function &getIterator() { static $times = 0; foreach ($this->data as &$value) { yield $value; } $times++; echo "getting ext iterator - $times\n"; } } $dataContainer = new DataContainer([77, 78, 79]); foreach ($dataContainer as &$value) { echo $value *= -1,"\n"; } //Must unset $value ... foreach($dataContainer as $value); var_dump($dataContainer);