3v4l.org

run code in 300+ PHP versions simultaneously
<?php $username = ''; $first_letter = $username[0];
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Warning: Uninitialized string offset 0 in /in/b00Jd on line 5
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Notice: Uninitialized string offset: 0 in /in/b00Jd on line 5

preferences:
83.69 ms | 407 KiB | 5 Q