php ci .bin.gz 文件上传解决思路

php ci .bin.gz 文件上传

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->function do_upload() {  $config['upload_path'] = './uploads/';  $config['allowed_types'] = 'bin.gz'; //是不是这个类型错了？  $this->load->library('upload', $config);  if ( ! $this->upload->do_upload())  {   $error = array('error' => $this->upload->display_errors());      $this->load->view('upload_form', $error);  }   else  {   $data = array('upload_data' => $this->upload->data());      $this->load->view('upload_success', $data);  } } 

错误信息是 You did not select a file to upload.

------解决方案--------------------
没有选择上传文件 
是不是没有在表单中加 enctype= "multipart/form-data "