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<?php $arr = array("D"=>"dog","a"=>"cat","A"=>"moose","d"=>"mouse"); ksort($arr); var_dump($arr);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { ["A"]=> string(5) "moose" ["D"]=> string(3) "dog" ["a"]=> string(3) "cat" ["d"]=> string(5) "mouse" }