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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 - 7.1.0
Notice: Use of undefined constant cmp - assumed 'cmp' in /in/bdEuu on line 4 Array ( [0] => abc [1] => Abc [2] => def )