3v4l.org

run code in 500+ PHP versions simultaneously
<?php $arr = [0, 1]; foreach ($arr as $k => &$v) { echo " [$k] => $v\n"; } $v = 5; var_dump($arr[1]);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.33, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9
[0] => 0 [1] => 1 int(5)

preferences:
135.39 ms | 1509 KiB | 4 Q