diff --git a/webapp/classes/Privilege.php b/webapp/classes/Privilege.php
index 73c60b5..fbf607d 100644
--- a/webapp/classes/Privilege.php
+++ b/webapp/classes/Privilege.php
@@ -55,7 +55,7 @@ class Privilege
             )
         );
 
-        if (!$row || $row['vip_info'] == NULL) {
+        if (!$row || is_null($row['vip_info'])) {
             return 0;
         }
 
diff --git a/webapp/classes/RechargeActivity.php b/webapp/classes/RechargeActivity.php
index 4044616..09f9ee0 100644
--- a/webapp/classes/RechargeActivity.php
+++ b/webapp/classes/RechargeActivity.php
@@ -37,7 +37,7 @@ class RechargeActivity
         );
 
         $activity = array();
-        if ($row && $row['activity'] != null && $row['activity'] != '') {
+        if ($row && !is_null($row['activity']) && !empty($row['activity'])) {
             $activity = json_decode($row['activity'], true);
         }
 
diff --git a/webapp/controller/MailController.class.php b/webapp/controller/MailController.class.php
index c3b0437..5342f5b 100644
--- a/webapp/controller/MailController.class.php
+++ b/webapp/controller/MailController.class.php
@@ -373,7 +373,7 @@ class MailController
             return;
         }
 
-        if ($rsp == null || $rsp == '') {
+        if (is_null($rsp) || empty($rsp)) {
             phpcommon\sendError(ERR_RETRY, '系统繁忙2');
             return;
         }
@@ -420,7 +420,7 @@ class MailController
             return;
         }
 
-        if ($rsp == null || $rsp == '') {
+        if (is_null($rsp) || empty($rsp)) {
             phpcommon\sendError(ERR_RETRY, '系统繁忙4');
             return;
         }
diff --git a/webapp/controller/RechargeActivity.trait.php b/webapp/controller/RechargeActivity.trait.php
index ed11e7a..f6b14f1 100644
--- a/webapp/controller/RechargeActivity.trait.php
+++ b/webapp/controller/RechargeActivity.trait.php
@@ -217,7 +217,7 @@ trait RechargeActivity
             )
         );
 
-        if ($rechargerow['vip_info'] == null || $rechargerow['vip_info'] == '') {
+        if (is_null($rechargerow['vip_info']) || empty($rechargerow['vip_info'])) {
             phpcommon\sendError(ERR_USER_BASE + 1, '没月卡');
             return;
         }
@@ -354,7 +354,7 @@ trait RechargeActivity
             )
         );
 
-        if ($rechargerow['activity'] == null || $rechargerow['activity'] == '') {
+        if (is_null($rechargerow['activity']) || empty($rechargerow['activity'])) {
             phpcommon\sendError(ERR_USER_BASE + 1, '没参与活动');
             return;
         }
diff --git a/webapp/controller/RechargeController.class.php b/webapp/controller/RechargeController.class.php
index 487166c..278d1f4 100644
--- a/webapp/controller/RechargeController.class.php
+++ b/webapp/controller/RechargeController.class.php
@@ -78,7 +78,7 @@ class RechargeController
             return;
         }
 
-        if ($rsp == null || $rsp == '') {
+        if (is_null($rsp) || empty($rsp)) {
             phpcommon\sendError(ERR_RETRY, '系统繁忙2');
             return;
         }
@@ -127,7 +127,7 @@ class RechargeController
             return;
         }
 
-        if ($rsp == null || $rsp == '') {
+        if (is_null($rsp) || empty($rsp)) {
             phpcommon\sendError(ERR_RETRY, '系统繁忙 2');
             return;
         }
@@ -176,7 +176,7 @@ class RechargeController
 
             $rechargeactivity = new classes\RechargeActivity();
             $activity = array();
-            if ($rechargerow && $rechargerow['activity'] != null && $rechargerow['activity'] != '') {
+            if ($rechargerow && !is_null($rechargerow['activity']) && !empty($rechargerow['activity'])) {
                 $activity = json_decode($rechargerow['activity'], true);
             }
             $rechargeactivity->updateActivityCur($activity, $diamonds, true);
@@ -206,7 +206,7 @@ class RechargeController
 
                 $firstdata = $rechargerow['first_data'];
                 if ($firstrecharge) {
-                    if ($firstdata == NULL || $firstdata == '') {
+                    if (is_null($firstdata) || empty($firstdata)) {
                         $firstdata = $goodsid;
                     } else {
                         $firstdata = $rechargerow['first_data'] . ',' . $goodsid;
@@ -304,7 +304,7 @@ class RechargeController
             return;
         }
 
-        if ($rsp == null || $rsp == '') {
+        if (is_null($rsp) || empty($rsp)) {
             phpcommon\sendError(ERR_RETRY, '系统繁忙2');
             return;
         }
@@ -434,7 +434,7 @@ class RechargeController
         }
 
         $daily_purchase = $rechargerow['daily_purchase'];
-        if ($daily_purchase == null || $daily_purchase == '') {
+        if (is_null($daily_purchase) || empty($daily_purchase)) {
             return true;
         }
 
@@ -615,7 +615,7 @@ class RechargeController
 
                 $firstdata = $rechargerow['first_data'];
                 if ($firstrecharge) {
-                    if ($firstdata == NULL || $firstdata == '') {
+                    if (is_null($firstdata) || empty($firstdata)) {
                         $firstdata = $goodsid;
                     } else {
                         $firstdata = $rechargerow['first_data'] . ',' . $goodsid;
@@ -682,7 +682,7 @@ class RechargeController
                 );
             } else {
                 $vip_info = array();
-                if ($rechargerow['vip_info'] != NULL) {
+                if (!is_null($rechargerow['vip_info'])) {
                     $vip_info = json_decode($rechargerow['vip_info'], true);
                 }
                 $found = false;
@@ -784,7 +784,7 @@ class RechargeController
                 );
             } else {
                 $daily_purchase = array();
-                if ($rechargerow['daily_purchase'] != NULL) {
+                if (!is_null($rechargerow['daily_purchase'])) {
                     $daily_purchase = json_decode($rechargerow['daily_purchase'], true);
                 }
                 $found = false;