fix 判断是否是来自微信

helper/util_helper.php

@@ -127,6 +127,10 @@ class util
     {
         $agent = request_helper::http_useragent();
         $pos = strpos($agent,"MicroMessenger");
-        return ($pos >= 0);
+        if($pos == false) {
+            return false;
+        } else {
+            return ($pos >= 0);
+        }
     }
 }