3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function doStuff() { $last = 0; $current = 1; yield 1; while (true) { $current = $last + $current; $last = $current - $last; yield $current; } } foreach(doStuff() as $num) echo $num, "\n"; ?>
based on PG81Y