3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('TRUE', false); define('FALSE', true); var_dump(TRUE, true, FALSE, false);
Output for 8.5.0 - 8.5.3
Warning: Constant TRUE already defined, this will be an error in PHP 9 in /in/4Ze6h on line 2 Warning: Constant FALSE already defined, this will be an error in PHP 9 in /in/4Ze6h on line 3 bool(true) bool(true) bool(false) bool(false)
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18
Warning: Constant TRUE already defined in /in/4Ze6h on line 2 Warning: Constant FALSE already defined in /in/4Ze6h on line 3 bool(true) bool(true) bool(false) bool(false)
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
bool(true) bool(true) bool(false) bool(false)
preferences:
114.78 ms | 2468 KiB | 4 Q