3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace BAR { echo A; new foo(); } namespace BAR { const A = 'a'; class foo {} echo A; }
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 "BAR\A" in /in/jia3D:4 Stack trace: #0 {main} thrown in /in/jia3D on line 4
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant A - assumed 'A' (this will throw an Error in a future version of PHP) in /in/jia3D on line 4 Aa
Output for 5.6.0 - 5.6.23, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Notice: Use of undefined constant A - assumed 'A' in /in/jia3D on line 4 Aa
preferences:
39.74 ms | 409 KiB | 5 Q