--TEST-- Creating an infinite fibonacci list using a generator --FILE-- <?php function fib() { list($a, $b) = [1, 1]; while (true) { yield $b; list($a, $b) = [$b, $a + $b]; } } foreach (fib() as $n) { if ($n > 1000) break; var_dump($n); } ?> --EXPECT-- int(1) int(2) int(3) int(5) int(8) int(13) int(21) int(34) int(55) int(89) int(144) int(233) int(377) int(610) int(987)