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<?php class DataContainer implements IteratorAggregate { // create an external Iterator: protected $data; public function __construct(array $data) { $this->data = $data; } public function &getIterator() { /*foreach ($this->data as &$value) { yield $value; }*/ return new ArrayIterator($this); } } $dataContainer = new DataContainer([77, 78, 79]); foreach ($dataContainer as &$value) { echo $value *= -1,"\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of & DataContainer::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/XJI5W on line 9 Notice: Only variable references should be returned by reference in /in/XJI5W on line 13 Fatal error: Uncaught Exception: Objects returned by DataContainer::getIterator() must be traversable or implement interface Iterator in /in/XJI5W:18 Stack trace: #0 {main} thrown in /in/XJI5W on line 18
Process exited with code 255.

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