3v4l.org

run code in 300+ PHP versions simultaneously
<?php define("f", "a"); define("f", "b"); echo f;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Constant f already defined in /in/Au2Ec on line 4 a
Output for 5.6.38, 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 f already defined in /in/Au2Ec on line 4 a
Output for 7.3.32 - 7.3.33
a

preferences:
155.12 ms | 401 KiB | 205 Q