3v4l.org

run code in 300+ PHP versions simultaneously
<?php $username = $_GET['user'] ?: 'nobody'; var_dump($username); $username = $_GET['user'] ?? 'nobody'; var_dump($username);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: Undefined array key "user" in /in/D6fcV on line 3 string(6) "nobody" string(6) "nobody"
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: Undefined array key "user" in /in/D6fcV on line 3 string(6) "nobody" string(6) "nobody"
Output for 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 index: user in /in/D6fcV on line 3 string(6) "nobody" string(6) "nobody"
Output for 7.3.32 - 7.3.33
string(6) "nobody" string(6) "nobody"
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '?' in /in/D6fcV on line 5
Process exited with code 255.

preferences:
254.6 ms | 402 KiB | 329 Q