3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('TRUE', false); define('FALSE', true); var_dump(TRUE, true, FALSE, false); echo "hallo";
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Constant TRUE already defined in /in/Qj2GK on line 2 Warning: Constant FALSE already defined in /in/Qj2GK on line 3 bool(true) bool(true) bool(false) bool(false) hallo
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
bool(true) bool(true) bool(false) bool(false) hallo
preferences:
212.44 ms | 403 KiB | 273 Q