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<?php var_dump(array('ab' => 'cd', 'Ab' => 'Cd', 'aB' => 'cD', 'AB' => 'CD'));
Output for 4.3.0 - 7.2.0
array(4) { ["ab"]=> string(2) "cd" ["Ab"]=> string(2) "Cd" ["aB"]=> string(2) "cD" ["AB"]=> string(2) "CD" }