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run code in 200+ php & hhvm versions
Bugs & Features
<?php $input_array = array("FirSt" => 1, "SecOnd" => 4); print_r(array_change_key_case($input_array, CASE_UPPER));
based on 4n3Lt
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
Array ( [FIRST] => 1 [SECOND] => 4 )