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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 pCLWK
Output for 4.3.0 - 7.1.0
array(2) { ["lol"]=> int(1) ["ddkdas"]=> string(10) "dsafdaDAFa" } int(1)