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<?php final class Test { const Enum = ['FOO' => 1, 'BAR' => 2, 'BAZ' => 3]; } var_dump(Test::Enum);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(3) { ["FOO"]=> int(1) ["BAR"]=> int(2) ["BAZ"]=> int(3) }
Output for 5.5.0 - 5.5.38
Fatal error: Arrays are not allowed in class constants in /in/ADhTv on line 5
Process exited with code 255.

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