3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [ 'x' => [ 5, 'xx' => 'XX', ], ]; var_export($arr);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 'x' => array ( 0 => 5, 'xx' => 'XX', ), )
preferences:
152.69 ms | 408 KiB | 5 Q