Online PHP editor | refs for QOEAs

<?php function makeGen(array $array = []): Generator { $item = current($array); yield $item; while($item = next($array)) { yield $item; } } class GeneratorIterator implements \Iterator { private $genMaker; private $genArg; private $current; public function __construct(callable $genMaker, $arg) { $this->genMaker = $genMaker; $this->genArg = $arg; $this->current = $genMaker($arg); } public function current() { return $this->current->current(); } public function key() { return $this->current->key(); } public function rewind() { $this->current = call_user_func($this->genMaker, $this->genArg); } public function valid() { return $this->current->valid(); } public function next() { $this->current->next(); } } $genIterator = new GeneratorIterator('makeGen', [1,2,3]); foreach($genIterator as $key => $value) { echo $key . ' -> ' . $value . "\n"; } echo "\n"; foreach($genIterator as $key => $value) { echo $key . ' -> ' . $value . "\n"; }