!362 【轻量级 PR】：修复当文件名称为中文时截断导致的乱码报错问题。

Merge pull request !362 from T2cc/N/A

application/common/library/Upload.php

@@ -358,7 +358,7 @@ class Upload
         $params = array(
             'admin_id'    => (int)session('admin.id'),
             'user_id'     => (int)$auth->id,
-            'filename'    => substr(htmlspecialchars(strip_tags($this->fileInfo['name'])), 0, 100),
+            'filename'    => mb_substr(htmlspecialchars(strip_tags($this->fileInfo['name'])), 0, 100),
             'category'    => $category,
             'filesize'    => $this->fileInfo['size'],
             'imagewidth'  => $this->fileInfo['imagewidth'],