php - 如何使用 Codeigniter 避免浏览器缓存

Question

面临与浏览器缓存相关的问题。

function doUpload(){

  $data['includeView'] = "profileconfirm";

 $config['upload_path'] = './img/images/uploaded/';
 $config['allowed_types'] = 'gif|jpg|png|jpeg';
 $config['max_size'] = '5000';
 $config['max_width']  = '1024';
 $config['max_height']  = '768';
 $config['file_ext'] =".jpeg";
 $config['file_name'] = $profileId.$config['file_ext'];
 $config['overwrite'] = TRUE;
 $this->load->library('upload', $config);

 $query = null ; 

 if ( ! $this->upload->do_upload()){
  // Error here
 }else{
 // Image uploaded sucess fully
 // $profile - business logic to populate $profile

  $data['PROFILE_DETAILS'] = $profile;

 $this->load->view('index', $data);
}

该方法用于图片上传。图片上传成功后，加载index View 页面，内部包含profileconfirm View 页面。

但是在 profileconfirm 页面上，新上传的图像不会反射(reflect)出来。有时它工作正常，但有时却不行，这种情况大多数时候都会发生。

请帮忙

Answer 1

您可以向客户端发送适当的 header 以禁用缓存:

....
$this->output->set_header("HTTP/1.0 200 OK");
$this->output->set_header("HTTP/1.1 200 OK");
$this->output->set_header('Last-Modified: '.gmdate('D, d M Y H:i:s', $last_update).' GMT');
$this->output->set_header("Cache-Control: no-store, no-cache, must-revalidate");
$this->output->set_header("Cache-Control: post-check=0, pre-check=0");
$this->output->set_header("Pragma: no-cache");
$this->load->view('index', $data);

注意:输出类是自动初始化的