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<?php class MyArrayIter implements Iterator { private $storage; public function __construct(array $a) { $storage = $a } public function current() { return current($this->storage); } public function key() { return key($this->storage); } public function next() { next($this->storage); } public function rewind() { reset($this->storage); } public function valid() { return key($this->storage) !== null; } } $i = 1; $a = [1,2,$i,4,5]; $iter = new MyArrayIter($a); foreach($iter as &$v) { $v = 1; } var_dump($a); var_dump($iter);