diff --git a/src/Gateways/Alipay/AppCharge.php b/src/Gateways/Alipay/AppCharge.php
index 3932b317..77b35215 100644
--- a/src/Gateways/Alipay/AppCharge.php
+++ b/src/Gateways/Alipay/AppCharge.php
@@ -74,7 +74,7 @@ protected function getBizContent(array $requestParams)
             //'enable_pay_channels' => '',
             'store_id'             => $requestParams['store_id'] ?? '',
             'specified_channel'    => 'pcredit',
-            'disable_pay_channels' => implode(self::$config->get('limit_pay', ''), ','),
+            'disable_pay_channels' => implode(',', self::$config->get('limit_pay', '')),
             'ext_user_info'        => $requestParams['ext_user_info'] ?? '',
             'business_params'      => $requestParams['business_params'] ?? '',
         ];
diff --git a/src/Gateways/Alipay/Notify.php b/src/Gateways/Alipay/Notify.php
index e5acefd0..3a403adc 100644
--- a/src/Gateways/Alipay/Notify.php
+++ b/src/Gateways/Alipay/Notify.php
@@ -35,7 +35,7 @@ public function request()
             throw new GatewayException('the notify data is empty', Payment::NOTIFY_DATA_EMPTY);
         }
 
-        if (isset($resArr['notify_type']) && isset($resArr['trade_status'])) {
+        if (isset($resArr['notify_type'], $resArr['trade_status'])) {
             $notifyWay = 'async'; // 异步
         } else {
             $notifyWay = 'sync'; // 同步
diff --git a/src/Gateways/Alipay/QrCharge.php b/src/Gateways/Alipay/QrCharge.php
index 4ef2f810..a4273f49 100644
--- a/src/Gateways/Alipay/QrCharge.php
+++ b/src/Gateways/Alipay/QrCharge.php
@@ -51,7 +51,7 @@ protected function getBizContent(array $requestParams)
             'body'                 => $requestParams['body'] ?? '',
             'operator_id'          => $requestParams['operator_id'] ?? '',
             'store_id'             => $requestParams['store_id'] ?? '',
-            'disable_pay_channels' => implode(self::$config->get('limit_pay', ''), ','),
+            'disable_pay_channels' => implode(',', self::$config->get('limit_pay', '')),
             // 使用禁用列表
             //'enable_pay_channels' => '',
             'terminal_id'             => $requestParams['terminal_id'] ?? '',
diff --git a/src/Gateways/Alipay/WapCharge.php b/src/Gateways/Alipay/WapCharge.php
index d3d966dd..60d8fac8 100644
--- a/src/Gateways/Alipay/WapCharge.php
+++ b/src/Gateways/Alipay/WapCharge.php
@@ -56,7 +56,7 @@ protected function getBizContent(array $requestParams)
             'extend_params'   => $requestParams['extend_params'] ?? '',
             // 使用禁用列表
             //'enable_pay_channels' => '',
-            'disable_pay_channels' => implode(self::$config->get('limit_pay', ''), ','),
+            'disable_pay_channels' => implode(',', self::$config->get('limit_pay', '')),
             'store_id'             => $requestParams['store_id'] ?? '',
             'specified_channel'    => $requestParams['specified_channel'] ?? '',
             'business_params'      => $requestParams['business_params'] ?? '',
diff --git a/src/Gateways/Alipay/WebCharge.php b/src/Gateways/Alipay/WebCharge.php
index 9e373949..5606891e 100644
--- a/src/Gateways/Alipay/WebCharge.php
+++ b/src/Gateways/Alipay/WebCharge.php
@@ -76,7 +76,7 @@ protected function getBizContent(array $requestParams)
             // 使用禁用列表
             //'enable_pay_channels' => '',
             'store_id'              => $requestParams['store_id'] ?? '',
-            'disable_pay_channels'  => implode(self::$config->get('limit_pay', ''), ','),
+            'disable_pay_channels'  => implode(',', self::$config->get('limit_pay', '')),
             'qr_pay_mode'           => $requestParams['qr_pay_mode'] ?? '2',
             'qrcode_width'          => $requestParams['qrcode_width'] ?? '',
             'settle_info'           => $requestParams['settle_info'] ?? '',
diff --git a/src/Gateways/CMBank/AppCharge.php b/src/Gateways/CMBank/AppCharge.php
index 178185e9..f62e2d36 100644
--- a/src/Gateways/CMBank/AppCharge.php
+++ b/src/Gateways/CMBank/AppCharge.php
@@ -43,7 +43,7 @@ protected function getRequestParams(array $requestParams)
     {
         $nowTime    = time();
         $timeExpire = $requestParams['time_expire'] ?? 0;
-        $timeExpire = $timeExpire - $nowTime;
+        $timeExpire -= $nowTime;
         if ($timeExpire < 3) {
             $timeExpire = 30; // 如果设置不合法，默认改为30
         }
diff --git a/src/Gateways/CMBank/LiteCharge.php b/src/Gateways/CMBank/LiteCharge.php
index 96745afe..4e7dd601 100644
--- a/src/Gateways/CMBank/LiteCharge.php
+++ b/src/Gateways/CMBank/LiteCharge.php
@@ -54,7 +54,7 @@ protected function getRequestParams(array $requestParams)
     {
         $nowTime    = time();
         $timeExpire = $requestParams['time_expire'] ?? 0;
-        $timeExpire = $timeExpire - $nowTime;
+        $timeExpire -= $nowTime;
         if ($timeExpire < 3) {
             $timeExpire = 30; // 如果设置不合法，默认改为30
         }
diff --git a/src/Gateways/CMBank/QrCharge.php b/src/Gateways/CMBank/QrCharge.php
index 3da4c2a2..6f7b70c0 100644
--- a/src/Gateways/CMBank/QrCharge.php
+++ b/src/Gateways/CMBank/QrCharge.php
@@ -54,7 +54,7 @@ protected function getRequestParams(array $requestParams)
     {
         $nowTime    = time();
         $timeExpire = $requestParams['time_expire'] ?? 0;
-        $timeExpire = $timeExpire - $nowTime;
+        $timeExpire -= $nowTime;
         if ($timeExpire < 3) {
             $timeExpire = 30; // 如果设置不合法，默认改为30
         }
diff --git a/src/Gateways/CMBank/WapCharge.php b/src/Gateways/CMBank/WapCharge.php
index 49a04aaa..803f4057 100644
--- a/src/Gateways/CMBank/WapCharge.php
+++ b/src/Gateways/CMBank/WapCharge.php
@@ -54,7 +54,7 @@ protected function getRequestParams(array $requestParams)
     {
         $nowTime    = time();
         $timeExpire = $requestParams['time_expire'] ?? 0;
-        $timeExpire = $timeExpire - $nowTime;
+        $timeExpire -= $nowTime;
         if ($timeExpire < 3) {
             $timeExpire = 30; // 如果设置不合法，默认改为30
         }
diff --git a/src/Gateways/CMBank/WebCharge.php b/src/Gateways/CMBank/WebCharge.php
index 8a9d34ab..a4ada516 100644
--- a/src/Gateways/CMBank/WebCharge.php
+++ b/src/Gateways/CMBank/WebCharge.php
@@ -54,7 +54,7 @@ protected function getRequestParams(array $requestParams)
     {
         $nowTime    = time();
         $timeExpire = $requestParams['time_expire'] ?? 0;
-        $timeExpire = $timeExpire - $nowTime;
+        $timeExpire -= $nowTime;
         if ($timeExpire < 3) {
             $timeExpire = 30; // 如果设置不合法，默认改为30
         }
diff --git a/src/Helpers/Rsa2Encrypt.php b/src/Helpers/Rsa2Encrypt.php
index 29020891..aa88fc85 100644
--- a/src/Helpers/Rsa2Encrypt.php
+++ b/src/Helpers/Rsa2Encrypt.php
@@ -52,7 +52,7 @@ public function encrypt($data)
             return '';
         }
 
-        $res = openssl_get_privatekey($this->key);
+        $res = openssl_pkey_get_private($this->key);
         if (empty($res)) {
             throw new \Exception('您使用的私钥格式错误，请检查RSA私钥配置');
         }
@@ -78,7 +78,7 @@ public function decrypt($content)
             return '';
         }
 
-        $res = openssl_get_privatekey($this->key);
+        $res = openssl_pkey_get_private($this->key);
         if (empty($res)) {
             throw new \Exception('您使用的私钥格式错误，请检查RSA私钥配置');
         }
diff --git a/src/Helpers/RsaEncrypt.php b/src/Helpers/RsaEncrypt.php
index 1bd3a1c3..593e6bd8 100644
--- a/src/Helpers/RsaEncrypt.php
+++ b/src/Helpers/RsaEncrypt.php
@@ -52,7 +52,7 @@ public function encrypt($data)
             return '';
         }
 
-        $res = openssl_get_privatekey($this->key);
+        $res = openssl_pkey_get_private($this->key);
         if (empty($res)) {
             throw new \Exception('您使用的私钥格式错误，请检查RSA私钥配置');
         }
@@ -78,7 +78,7 @@ public function decrypt($content)
             return '';
         }
 
-        $res = openssl_get_privatekey($this->key);
+        $res = openssl_pkey_get_private($this->key);
         if (empty($res)) {
             throw new \Exception('您使用的私钥格式错误，请检查RSA私钥配置');
         }
diff --git a/src/Helpers/StrUtil.php b/src/Helpers/StrUtil.php
index ccfebd5d..5af7d895 100644
--- a/src/Helpers/StrUtil.php
+++ b/src/Helpers/StrUtil.php
@@ -32,7 +32,7 @@ public static function getNonceStr($length = 32)
         $chars = 'abcdefghijklmnopqrstuvwxyz0123456789';
         $str   = '';
         for ($i = 0; $i < $length; $i++) {
-            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
+            $str .= $chars[mt_rand(0, strlen($chars) - 1)];
         }
         return $str;
     }