3v4l.org

run code in 500+ PHP versions simultaneously
<?php $a = 'foo'; echo $a[0];
Output for 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
f
preferences:
53.61 ms | 888 KiB | 4 Q