/**
  * 获取可用库存及天数
  */
 public function act_getStockDays()
 {
     global $dbconn;
     $skuArr = isset($_REQUEST['skuArr']) ? json_decode($_REQUEST['skuArr'], TRUE) : '';
     if (empty($skuArr)) {
         self::$errCode = '001';
         self::$errMsg = 'skuArr param error';
         return array();
     }
     $fields = implode(',', array('sku', 'everyday_sale', 'stock_qty', 'ow_stock', 'salensend'));
     $where = 'WHERE sku IN (\'' . implode("','", $skuArr) . '\')';
     $szdata = SkuStatisticsModel::getInfo($fields, $where);
     $szskuarr = empty($szdata) ? array() : array_keys($szdata);
     $fields = implode(',', array('sku', 'everyday_sale', 'virtual_stock'));
     $where = 'WHERE sku IN (\'' . implode("','", $skuArr) . '\')';
     $owdata = SkuStatisticsModel::getOwInfo($fields, $where);
     $owskuarr = empty($owdata) ? array() : array_keys($owdata);
     $res = array();
     $skuarray = array_unique(array_merge($szskuarr, $owskuarr));
     if (!empty($skuarray)) {
         foreach ($skuarray as $sku) {
             $sz_stock = $ow_stock = 0;
             $sz_days = $ow_days = 0;
             if (!empty($szdata[$sku])) {
                 $sz_stock = $szdata[$sku]['stock_qty'] + $szdata[$sku]['ow_stock'] - $szdata[$sku]['salensend'];
                 $sz_days = $szdata[$sku]['everyday_sale'] == 0 ? 0 : round_num($sz_stock / $szdata[$sku]['everyday_sale'], 2);
             }
             if (!empty($owdata[$sku])) {
                 $ow_stock = $owdata[$sku]['virtual_stock'];
                 $ow_days = $owdata[$sku]['everyday_sale'] == 0 ? 0 : round_num($ow_stock / $owdata[$sku]['everyday_sale'], 2);
             }
             $res[$sku]['sz_stock'] = $sz_stock;
             $res[$sku]['sz_days'] = $sz_days;
             $res[$sku]['ow_stock'] = $ow_stock;
             $res[$sku]['ow_days'] = $ow_days;
         }
     }
     return $this->_checkReturnData($res, array());
 }