Online PHP editor | output for BS5HF

<?php function generator(): iterable { $count = -1; while (true) { echo 'Stopping: ', $count, \PHP_EOL; yield ++$count; echo 'Resuming: ', $count, \PHP_EOL; } } function limit(\Iterator $inner, int $count) { if (1 > $count) return; $inner->rewind(); while ($inner->valid()) { if (!$count--) { return; } yield $inner->key() => $inner->current(); $inner->next(); } } echo "Construct:\n"; $i = limit(generator(), 3); echo "Rewind:\n"; $i->rewind(); echo "\n1st iteration\n"; echo $i->valid() ? "Valid\n" : "Not valid\n"; echo "Current value: ", $i->current(), "\n"; $i->next(); echo "\n2nd iteration\n"; echo $i->valid() ? "Valid\n" : "Not valid\n"; echo "Current value: ", $i->current(), "\n"; $i->next(); echo "\n3rd iteration\n"; echo $i->valid() ? "Valid\n" : "Not valid\n"; echo "Current value: ", $i->current(), "\n"; $i->next(); echo "\n4th iteration\n"; echo $i->valid() ? "Valid\n" : "Not valid\n"; echo "Current value: ", $i->current(), "\n"; $i->next(); echo "\n5th iteration\n"; echo $i->valid() ? "Valid\n" : "Not valid\n"; echo "Current value: ", $i->current(), "\n"; $i->next();