3v4l.org

run code in 300+ PHP versions simultaneously
<?php //define('HELLO', 'hello'); echo HELLO;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.14, 8.4.1
Fatal error: Uncaught Error: Undefined constant "HELLO" in /in/LOvdj:4 Stack trace: #0 {main} thrown in /in/LOvdj on line 4
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant HELLO - assumed 'HELLO' (this will throw an Error in a future version of PHP) in /in/LOvdj on line 4 HELLO
Output for 7.1.0 - 7.1.33
Notice: Use of undefined constant HELLO - assumed 'HELLO' in /in/LOvdj on line 4 HELLO
preferences:
61.17 ms | 408 KiB | 5 Q