3v4l.org

run code in 500+ PHP versions simultaneously
<?php $arr = []; ['foo' => &$v] = $arr; $v = 1; var_export($arr);
Output for 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
array ( 'foo' => 1, )
preferences:
67.34 ms | 1040 KiB | 4 Q