3v4l.org

run code in 500+ PHP versions simultaneously
<?php $items = [ 1 => 'A', 1 => 'B', 1 => 'C' ]; var_dump($items);
Output for 7.1.25 - 7.1.27, 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 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
array(1) { [1]=> string(1) "C" }
preferences:
95.84 ms | 1420 KiB | 4 Q