3v4l.org

run code in 300+ PHP versions simultaneously
<?php print_r([][0] . PHP_EOL);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined array key 0 in /in/2g1F5 on line 3
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined offset: 0 in /in/2g1F5 on line 3
Output for 7.3.32 - 7.3.33

preferences:
215.44 ms | 401 KiB | 287 Q