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<?php $a=array("abc","Abc","def"); function cmp($a,$b){return strcmp(strtolower($a),strtolower($b));} usort($a,"cmp"); print_r($a); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => abc [1] => Abc [2] => def )