3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Baz { function foo() { $cl = function() { class Bar {} }; } }
Output for 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
Fatal error: Class declarations may not be nested in /in/pbSTG on line 6
Process exited with code 255.
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161.3 ms | 1067 KiB | 8 Q