3v4l.org

run code in 500+ PHP versions simultaneously
<?php $array = []; $array[-5] = 1; $array[] = 2; var_dump($array); ?>
Output for 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(2) { [-5]=> int(1) [-4]=> int(2) }
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.30
array(2) { [-5]=> int(1) [0]=> int(2) }
preferences:
59.78 ms | 841 KiB | 4 Q