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<?php $array = array( '13-2014' => 'z', '14-2014' => 'b', '6-2014' => 'a', ); ksort($array); print_r($array);
Output for 4.3.0 - 7.1.0
Array ( [13-2014] => z [14-2014] => b [6-2014] => a )