3v4l.org

run code in 300+ PHP versions simultaneously
<?php $valueOfTrue = 0; // this was coming from config in real-world. $valueOfFalse = 1; // Same here. ^ define('TRUE', $valueOfTrue); define('FALSE', $valueOfFalse); var_dump(TRUE, FALSE); // Happy debugging... if (TRUE) { echo 'yay'; }
Output for 8.5.0 - 8.5.3
Warning: Constant TRUE already defined, this will be an error in PHP 9 in /in/UhMGX on line 5 Warning: Constant FALSE already defined, this will be an error in PHP 9 in /in/UhMGX on line 6 bool(true) bool(false) yay
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/UhMGX on line 5 Warning: Constant FALSE already defined in /in/UhMGX on line 6 bool(true) bool(false) yay
Output for 5.1.3 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
bool(true) bool(false) yay
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.2
int(0) int(1)
preferences:
90.68 ms | 2460 KiB | 4 Q