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<?php class Entity { protected $_properties = []; public function &__get($property) { $value = null; return $value; } public function __set($property, $value) { $property = [$property => $value]; foreach ($property as $p => $value) { $this->_properties[$p] = $value; } } } class CustomIterator extends IteratorIterator { public $callback; public function __construct($items) { $this->callback = function ($a) { $a->foo .= ' world'; return $a; }; parent::__construct($items); } public function current() { $c = $this->callback; return $c(parent::current()); } } $entity = new Entity(); $it = new CustomIterator(new ArrayIterator([$entity])); $it->rewind(); var_dump($it->current());
Output for git.master
Deprecated: Return type of CustomIterator::current() should either be compatible with IteratorIterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/pb3a2 on line 37 object(Entity)#1 (1) { ["_properties":protected]=> array(1) { ["foo"]=> string(6) " world" } }

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