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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
Warning: Uninitialized string offset 0 in /in/b00Jd on line 5
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Warning: Uninitialized string offset 0 in /in/b00Jd on line 5
Output for 5.5.38, 5.6.40, 7.0.15, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Notice: Uninitialized string offset: 0 in /in/b00Jd on line 5

preferences:
134.98 ms | 402 KiB | 161 Q