friend activity link

app/Http/Controllers/Wap/User/CoflController.php

@@ -84,7 +84,7 @@ class CoflController extends Controller
             $user = $this->getUsers($openid);
             if($user[0]){
                 $url_format = '%s://site%s.%s.com%s';
-                $url = printf(
+                $url = sprintf(
                     $url_format,
                     env('PROTOCOL'),
                     encodeDistributionChannelId($user[1]),