3v4l.org

run code in 300+ PHP versions simultaneously
<?php ['one' => $result[], 'one' => $result[]] = ['one' => 1]; var_export($result);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.26, 8.1.0 - 8.1.13
array ( 0 => 1, 1 => 1, )

preferences:
55.04 ms | 409 KiB | 5 Q