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<?php function gen1() { yield 1; yield 2; yield 3; return 42; } function yieldFrom($iter) { yield from $iter; } $g = function($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; }; $gen = $g(gen1()); foreach($gen as $val) { var_dump($val); } var_dump($gen->getReturn()); echo "=============\n"; $gen = yieldFrom(gen1()); foreach($gen as $val) { var_dump($val); } var_dump($gen->getReturn());