3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = 'bar'; echo $foo[0]; echo $foo[-1];
Output for 7.1.0 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
br
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33
b Notice: Uninitialized string offset: -1 in /in/0kM6Y on line 6
preferences:
224.03 ms | 402 KiB | 294 Q