code review by fei.hong: do format category codes

@@ -46,6 +46,7 @@ class ClassModel
             $genderArr = array('boy' => '1,3', 'girl' => '2,3', 'kids' => '1,2,3', 'lifestyle' => '1,2,3');
             $oneClass = array();
             $item = array();
+            $subitem = array();
             foreach ($data['data'] as $k => $v) {
                 $oneClass = array('name' => ucfirst(rtrim($k, 's')), 'ca' => array());