diff --git a/third_party/phpcommon b/third_party/phpcommon
index 4fa9d00..914355e 160000
--- a/third_party/phpcommon
+++ b/third_party/phpcommon
@@ -1 +1 @@
-Subproject commit 4fa9d00842f4fd2fb2c0b3c82bfdaa4f7ac6a602
+Subproject commit 914355e0f3d6ca491b299489adf475f93d211389
diff --git a/webapp/controller/HangController.class.php b/webapp/controller/HangController.class.php
index 22ef12f..e2e0c63 100644
--- a/webapp/controller/HangController.class.php
+++ b/webapp/controller/HangController.class.php
@@ -54,11 +54,11 @@ class HangController{
                                            ':accountid' => $account_id
                                        ));
             $ret = $conn->execScript('UPDATE user SET coin_num=:coin_num ' .
-                                         ' WHERE accountid=:accountid;',
-                                         array(
-                                             ':accountid' => $account_id,
-                                             ':coin_num' => $num + $row['coin_num']
-                                         ));
+                                     ' WHERE accountid=:accountid;',
+                                     array(
+                                         ':accountid' => $account_id,
+                                         ':coin_num' => $num + $row['coin_num']
+                                     ));
         }
         echo json_encode(array(
             'errcode' => 0,
diff --git a/webapp/controller/RankController.class.php b/webapp/controller/RankController.class.php
index b862047..b742340 100644
--- a/webapp/controller/RankController.class.php
+++ b/webapp/controller/RankController.class.php
@@ -44,10 +44,10 @@ class RankController{
                 }
                 array_push($kill_list, array(
                     'account_id' => $row['accountid'],
-                    'kill' => $row['kills'] / $row['game_times'],
-                    'alive'=> $row['alive_time'] / $row['game_times'],
-                    'harm' => $row['harm'] / $row['game_times'],
-                    'win_rate' => $row['win_times'] / $row['game_times'],
+                    'kill' => phpcommon\safeDiv($row['kills'], $row['game_times']),
+                    'alive'=> phpcommon\safeDiv($row['alive_time'], $row['game_times']),
+                    'harm' => phpcommon\safeDiv($row['harm'], $row['game_times']),
+                    'win_rate' => phpcommon\safeDiv($row['win_times'], $row['game_times']),
                     'win_game' => $row['win_times']
                 ));
                 $i++;
@@ -64,10 +64,10 @@ class RankController{
                 }
                 array_push($alive_list, array(
                     'account_id' => $row['accountid'],
-                    'kill' => $row['kills'] / $row['game_times'],
-                    'alive'=> $row['alive_time'] / $row['game_times'],
-                    'harm' => $row['harm'] / $row['game_times'],
-                    'win_rate' => $row['win_times'] / $row['game_times'],
+                    'kill' => phpcommon\safeDiv($row['kills'], $row['game_times']),
+                    'alive'=> phpcommon\safeDiv($row['alive_time'], $row['game_times']),
+                    'harm' => phpcommon\safeDiv($row['harm'], $row['game_times']),
+                    'win_rate' => phpcommon\safeDiv($row['win_times'], $row['game_times']),
                     'win_game' => $row['win_times']
                 ));
                 $i++;
@@ -84,10 +84,10 @@ class RankController{
                 }
                 array_push($harm_list, array(
                     'account_id' => $row['accountid'],
-                    'kill' => $row['kills'] / $row['game_times'],
-                    'alive'=> $row['alive_time'] / $row['game_times'],
-                    'harm' => $row['harm'] / $row['game_times'],
-                    'win_rate' => $row['win_times'] / $row['game_times'],
+                    'kill' => phpcommon\safeDiv($row['kills'], $row['game_times']),
+                    'alive'=> phpcommon\safeDiv($row['alive_time'], $row['game_times']),
+                    'harm' => phpcommon\safeDiv($row['harm'], $row['game_times']),
+                    'win_rate' => phpcommon\safeDiv($row['win_times'], $row['game_times']),
                     'win_game' => $row['win_times']
                 ));
                 $i++;
@@ -104,10 +104,10 @@ class RankController{
                 }
                 array_push($rate_list, array(
                     'account_id' => $row['accountid'],
-                    'kill' => $row['kills'] / $row['game_times'],
-                    'alive'=> $row['alive_time'] / $row['game_times'],
-                    'harm' => $row['harm'] / $row['game_times'],
-                    'win_rate' => $row['win_times'] / $row['game_times'],
+                    'kill' => phpcommon\safeDiv($row['kills'], $row['game_times']),
+                    'alive'=> phpcommon\safeDiv($row['alive_time'], $row['game_times']),
+                    'harm' => phpcommon\safeDiv($row['harm'], $row['game_times']),
+                    'win_rate' => phpcommon\safeDiv($row['win_times'], $row['game_times']),
                     'win_game' => $row['win_times']
                 ));
                 $i++;
@@ -124,10 +124,10 @@ class RankController{
                 }
                 array_push($win_list, array(
                     'account_id' => $row['accountid'],
-                    'kill' => $row['kills'] / $row['game_times'],
-                    'alive'=> $row['alive_time'] / $row['game_times'],
-                    'harm' => $row['harm'] / $row['game_times'],
-                    'win_rate' => $row['win_times'] / $row['game_times'],
+                    'kill' => phpcommon\safeDiv($row['kills'], $row['game_times']),
+                    'alive'=> phpcommon\safeDiv($row['alive_time'], $row['game_times']),
+                    'harm' => phpcommon\safeDiv($row['harm'], $row['game_times']),
+                    'win_rate' => phpcommon\safeDiv($row['win_times'], $row['game_times']),
                     'win_game' => $row['win_times']
                 ));