3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = []; $a['3'] = 1; var_dump($a);
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(1) { [3]=> int(1) }
preferences:
55.99 ms | 840 KiB | 4 Q