u

app/Services/BackflowService.php

@@ -36,10 +36,10 @@ class BackflowService extends BaseService
         }
         $restriction = Config::where('field', 'huishui_percentage')->first()->val;
         $difference = bcadd($backflow->recharge_amount, $backflow->withdrawal_amount, 2);
-        $difference = $difference * -1;
+        $difference = abs($difference);
         if ($difference >= $restriction) {
             $backflow->amount = bcmul($difference, $backflow->backflow_ratio, 2);
-        }else{
+        } else {
             $backflow->amount = 0;
         }
         $backflow->save();