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run code in 300+ PHP versions simultaneously
<?php class X { const A = FOO; const B = BAR; } echo X::A;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Undefined constant "FOO" in /in/99L6F:8 Stack trace: #0 {main} thrown in /in/99L6F on line 8
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 FOO - assumed 'FOO' (this will throw an Error in a future version of PHP) in /in/99L6F on line 8 FOO
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25
Notice: Use of undefined constant FOO - assumed 'FOO' in /in/99L6F on line 8 FOO

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