Online PHP editor | output for 1iuF2

<?php function yieldFrom($iter) { $isSubgenerator = $iter instanceof Generator; $received = null; $send = true; while ($iter->valid()) { if ($isSubgenerator) { $next = $send ? $iter->send($received) : $iter->throw($received); } else { $next = $iter->current(); $iter->next(); } try { $received = yield $next; $send = true; } catch (Exception $e) { if ($isSubgenerator) { $received = $e; $send = false; } else { throw $e; } } } return $isSubgenerator ? $iter->getReturn() : null; }; function gen1() { yield 1; yield 2; yield 3; } function gen2() { yield from gen1(); } $x = yieldFrom(gen1()); foreach($x as $val) { var_dump($val); } $y = gen2(); foreach($y as $val) { var_dump($val); }