在PHP中通过子域进行共享会话 [英] sharing session over subdomains in PHP

问题描述

我使用CI。
我想通过子域共享会话
我正在使用数据库存储会话

I am using CI. I want to share session over subdomains And I'm using database to store sessions

我试过了

ini_set('session.cookie_domain', substr($_SERVER['SERVER_NAME'],strpos($_SERVER['SERVER_NAME'],"."),100));

if(session_id ==''){session_start();}

这意味着xycom和zycom将使用公共会话
帮助我，pls

That means x.y.com and z.y.com will use common session help me, pls

推荐答案

已经知道你的域名，有什么原因你使用substr来确定它吗？如果你刚刚使用，你可以更容易阅读：

Considering the fact that you already know your domain name, is there a reason why you use substr to determine it? You could would be much more readable if you just used:

ini_set('session.cookie_domain', '.domain.tld');

对于跨多个子域的Cookie，Cookie域必须以点（。）开头，后跟所有子域的公共部分（最可能是domain.tld。）

For cookies to work across multiple subdomains, the cookie domain must start with a dot (.) followed by the common part of all the sub-domains (most likely domain.tld.)

此外，您的帖子的第二行，您检查会话是否需要开始是错误的。您在session_id后缺少一组括号，因为它是一个函数，而不是常数。条件语句（if）总是会失败，导致每次都调用session_start（）。

Also, the second line of your post, the one where you check if the session needs to be started is wrong. You're missing a set of parentheses after session_id because it's a function and not a constant. The conditional statement (if) would always fail causing session_start() to be called every time.

if ( empty(session_id()) ) session_start();

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