修复缴费金额为0显示的bug

application/em/model/EmInvoice.php

@@ -51,8 +51,11 @@ class EmInvoice extends Base
             if($item['payment_balance'] == 0){
                 $item['paid_amount'] = $item['payment_amount'] ;
             } else {
-                $temp = $item['payment_amount'] - $item['payment_balance'];
-                $item['paid_amount'] = $temp == 0 ? $temp : round($item['payment_amount'] - $item['payment_balance'],3);
+                if(!is_numeric($item['payment_amount']) || !is_numeric($item['payment_balance'])){
+                    $item['payment_amount'] =  (float)$item['payment_amount'];
+                    $item['payment_balance'] =  (float)$item['payment_balance'];
+                }
+                $item['paid_amount'] = round($item['payment_amount'] - $item['payment_balance'],3);
             }
 
             if($item['settle_balance'] == 0){