ci 框架，视频上传的问题

 //$id是本条文章的id号，意思是每个文件夹只能存放50条视频 public function addmove($id){     $uid = $this->session->userdata('id');     $a=(int)($id/50);     $up_file_path=FILEPATH.'movies/'.$a;     if(is_dir($up_file_path)){         $up_file_path=$up_file_path;     }     else {         mkdir($up_file_path,0777);     }     $config['upload_path'] = $up_file_path;        $config['allowed_types'] = 'mp4|avi';        $config['max_size'] = '1000000';        $this->load->library('upload', $config);        $this->upload->do_upload("fileurl");        if(!$this->upload->do_upload('fileurl'))        {            $error = array('error' => $this->upload->display_errors());        }        $data =  $this->upload->data();        $strlen=strlen(FILEPATH);        $movepath=substr($data['full_path'],$strlen);        $data1 = array(            'fileurl' => '/media/'.$movepath,            'file_name' => $data['raw_name']        );        $this->db->where('id', $id);        $this->db->update('content', $data1); }