3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace BAR { echo A; new foo(); } namespace BAR { const A = 'a'; class foo {} }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
Fatal error: Uncaught Error: Undefined constant "BAR\A" in /in/aAmI3:4 Stack trace: #0 {main} thrown in /in/aAmI3 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 A - assumed 'A' (this will throw an Error in a future version of PHP) in /in/aAmI3 on line 4 A
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.0.29, 7.1.0 - 7.1.25
Notice: Use of undefined constant A - assumed 'A' in /in/aAmI3 on line 4 A

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