3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo "\nLets try to redefine true..\n"; define("true", false); if (true) { echo "TRUE"; } else { echo "FALSE"; } echo "\nNow redefine TRUE..\n"; define("TRUE", false); if (TRUE) { echo "TRUE"; } else { echo "FALSE"; }
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
Lets try to redefine true.. Warning: Constant true already defined in /in/Fqtv1 on line 3 TRUE Now redefine TRUE.. Warning: Constant TRUE already defined in /in/Fqtv1 on line 12 TRUE
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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Lets try to redefine true.. Notice: Constant true already defined in /in/Fqtv1 on line 3 TRUE Now redefine TRUE.. TRUE
Output for 7.3.32 - 7.3.33, 7.4.26
Lets try to redefine true.. TRUE Now redefine TRUE.. TRUE
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 - 5.1.2
Lets try to redefine true.. Notice: Constant true already defined in /in/Fqtv1 on line 3 TRUE Now redefine TRUE.. FALSE
Output for 4.3.7 - 4.3.8, 5.0.0
Lets try to redefine true.. Notice: Constant already defined in /in/Fqtv1 on line 3 TRUE Now redefine TRUE.. FALSE
preferences:
207.24 ms | 401 KiB | 330 Q