3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('true', false); define('false', true); var_dump( true, false, 1 === 1, 1 === 0 );
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/ZgajG on line 3 Warning: Constant false already defined in /in/ZgajG on line 4 bool(true) bool(false) bool(true) bool(false)
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.3.11, 4.4.0 - 4.4.9, 5.0.1 - 5.0.5, 5.1.0 - 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 - 5.6.40, 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: Constant true already defined in /in/ZgajG on line 3 Notice: Constant false already defined in /in/ZgajG on line 4 bool(true) bool(false) bool(true) bool(false)
Output for 7.3.32 - 7.3.33
bool(true) bool(false) bool(true) bool(false)
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/ZgajG on line 3 Notice: Constant already defined in /in/ZgajG on line 4 bool(true) bool(false) bool(true) bool(false)
preferences:
290.89 ms | 402 KiB | 457 Q