Online PHP editor | output for eV5ZM

<?php function count_to_ten() { $i = 1; $cmd = yield $i; if ($cmd == 't') { echo "close"; return false; } yield 3 => 2; yield from [3, 4]; yield from new ArrayIterator([5, 6]); yield from seven_eight(); return yield from nine_ten(); } function seven_eight() { yield 7; yield from eight(); } function eight() { yield 8; } function nine_ten() { yield 9; return 10; } $gen = count_to_ten(); foreach ($gen as $k => $num) { echo "$k -> $num \n"; //echo $gen->send('t'); } var_dump( $gen->getReturn());