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run code in 150+ php & hhvm versions
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<?php $x = array('Lol' => 1, 'dDkDAs' => 'dsafdaDAFa'); var_dump(array_change_key_case($x, CASE_UPPER));
based on kG2CV
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["LOL"]=> int(1) ["DDKDAS"]=> string(10) "dsafdaDAFa" }