CodeIgniter:“您试图上传的文件类型不被允许.“我需要上传.dwg文件”

      
函数step8()｛$ data[‘应用’]= $ this -> license_m -> get_byID ($ this ->会话->用户数据(L_ID)) ->行();
    if($this->input->post('submit')){
        $data= array(
            'DESC'   => $this->input->post('DESC',true),                            
            'L_ID'   => $this->session->userdata('L_ID')                            
        );
        if($_FILES['FILE_URL']['name'])
        {
                $config['upload_path'] = './uploads/';
                $config['allowed_types'] = 'dxf|dwg|gif|jpg|png|pdf|doc|docx|txt|rar|zip|bmp';
                $config['max_size'] = '0';
                $config['encrypt_name'] = true;
                $this->load->library('upload', $config);
                if ( ! $this->upload->do_upload('FILE_URL'))
                    echo json_encode($this->upload->display_errors('<p>','</p>'));
                else
                {
                    $upload_data = $this->upload->data();
                    $FILE_URL=$upload_data['file_name'];
                    $data['FILE_URL']=$FILE_URL;
                    $status=$this->license_m->add_attachment($data);
                    }}}
 之前
 */