Codeigniter用户数据不可用 [英] Codeigniter userdata not avaliable

问题描述

我为我的项目使用CodeIgniter。我接近结束，我现在不能改变会话引擎。我有在网址上发表评论的captcha图片：

I'm using CodeIgniter for my project. I'm near end and I cannot change session "engine" now. I have captcha image for comment posting on url:

example.com/captcha

和代码：

this->load->library('session');
header("Content-type: image/jpeg");
/*
* Image generation code...
*/
$this->session->set_userdata('captcha', strtolower($word));
imagejpeg($image);
imagedestroy($image);

通常当我提交表单时，我使用

Usually when I'm submitting a form I use

<img src="example.com/captcha" />

来生成图像并设置userdata。但这一次它不工作。 $ this-> session-> userdata（'captcha'）为空。

to generate image and set userdata. But this time it doesn't work. $this->session->userdata('captcha') is empty.

但是如果我直接访问图像sessiondata设置，下一次提交有一个$ word是在直接访问图像/验证码时生成的。

But if I visit image directly sessiondata is set and on next submit there is a $word which was generated on direct access of image/captcha. What could cause this?

推荐答案

图片在域名前加上www前缀，而索引在domain.com上。我通过设置会话的数据库来了解这一点。我看到有两个条目为一个页面访问具有不同的session_id。

The image was on domain with "www" prefix, while index was on domain.com. I figure this out by setting database for sessions. I've seen there were two entries for one page visit with different session_id.

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