3v4l.org

run code in 300+ PHP versions simultaneously
<?php function run(int $max) { for ($i=1; $i<5; $i++) { unset($y, $z); yield ($y = $i*3) => $y; yield $z => ($z = $i*3); } } foreach(run(10) as $key => $value) { echo $key, ' => ', $value, PHP_EOL; }
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
3 => 3 3 => 3 6 => 6 6 => 6 9 => 9 9 => 9 12 => 12 12 => 12

preferences:
91.11 ms | 406 KiB | 5 Q