过滤表情

app-hd/controllers/MtController.php

@@ -26,6 +26,15 @@ class MtController extends PublicController
 
     public $guestAccess = [];
 
+    protected function filterEmoji($str)
+    {
+        $str = preg_replace_callback('/./u',
+            function (array $match) {
+                return strlen($match[0]) >= 4 ? '' : $match[0];
+            }, $str);
+        return $str;
+    }
+
     //已确认订单通知
     public function actionConfirmOrder()
     {
@@ -106,7 +115,7 @@ class MtController extends PublicController
                 return Json::encode(['data' => 'ok']);
             }
 
-            $caution = $post['caution'] ?? '';
+            $caution = isset($post['caution']) && !empty($post['caution']) ? $this->filterEmoji($post['caution']) : '';
             $remark = $caution;
 
             $bookMobile = $post['order_phone_number'] ?? '';