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<?php enum ArrayKeys { case IncludeAll; } $array = [ 'empty' => '', 'enum' => ArrayKeys::IncludeAll, 'zero' => 0, 'one' => 1, 'null' => null, 'false' => false, 'true' => true, ]; var_export(array_keys($array, ArrayKeys::IncludeAll));
Output for git.master_jit, git.master
array ( 0 => 'enum', )

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