diff --git a/application/common.php b/application/common.php
index 519a6707..08eae7aa 100644
--- a/application/common.php
+++ b/application/common.php
@@ -57,4 +57,16 @@ function makePathToUrl($path,$type = 2)
         return trim(str_replace(DS, '/',UPLOAD_PATH.$path),'.');
     }else return '';
 
+}
+// 过滤掉emoji表情
+function filterEmoji($str)
+{
+    $str = preg_replace_callback(    //执行一个正则表达式搜索并且使用一个回调进行替换
+        '/./u',
+        function (array $match) {
+            return strlen($match[0]) >= 4 ? '' : $match[0];
+        },
+        $str);
+
+    return $str;
 }
\ No newline at end of file