3v4l.org

run code in 300+ PHP versions simultaneously
<?php function generator($n) { if ($n <= 0) { yield 0; } else { yield $n; foreach(generator($n - 1) as $l) { yield $l; } } } foreach(generator(10) as $l) { print $l; }
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.22, 8.1.0 - 8.1.9
109876543210

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46.68 ms | 410 KiB | 5 Q