diff --git a/webapp/controller/BagController.class.php b/webapp/controller/BagController.class.php
index b25def3c..d0086c17 100644
--- a/webapp/controller/BagController.class.php
+++ b/webapp/controller/BagController.class.php
@@ -185,6 +185,7 @@ class BagController extends BaseAuthedController {
             return;
         }
         $costItems = mt\Item::getUseCostItems($itemMeta);
+        error_log(json_encode($costItems));
         $lackItem = null;
         if (!$this->_hasEnoughItems($costItems, $lackItem)) {
             $this->_rspErr(3, $this->_getLackItemErrMsg($lackItem));
diff --git a/webapp/mt/Item.php b/webapp/mt/Item.php
index a0ad5ecf..dd4f66ca 100644
--- a/webapp/mt/Item.php
+++ b/webapp/mt/Item.php
@@ -172,13 +172,11 @@ class Item {
     public static function getUseCostItems($itemMeta)
     {
         $costItems = array();
-        $tmpStrs1 = splitStr1($itemMeta['use_cost']);
-        foreach ($tmpStrs1 as $tmpStr1) {
-            $tmpStrs2 = splitStr2($tmpStr1);
-            if (count($tmpStrs2) >= 2) {
+        foreach (splitStr2($itemMeta['use_cost']) as $arr) {
+            if (count($arr) >= 2) {
                 array_push($costItems, array(
-                    'item_id' => $tmpStrs2[0],
-                    'item_num' => $tmpStrs2[1]
+                    'item_id' => $arr[0],
+                    'item_num' => $arr[1]
                 ));
             }
         }