How to correctly set PHP session control Session_name

Definition: String Session_name ([string $name]) Description:

1. Configured in PHP.ini as: Session. Name = Phpsessid
2. When the request begins, the session name is reset and stored to the session. name configuration item.
3. So if you want to change the php.ini configuration file without changing it, the session_name must be in session_start () or
4. Session_register() before setting session_name.

Code Demo:

• [Start session first, then set Session_name]

2. <?php
4. /**
6. * In- Depth understanding of PHP session control
8. * User:gutops
10. */
12. Start a new session
14. Session_Start ();
16. Set session_name
18. Session_name (' phpsessid_new ');
20. echo session_name (); // output is phpsessid_new

  so sesssion_name not changed, view browser  Cookies name for phpsessid (php.ini in the default settings of the Span class= "Hljs-selector-tag" >session.name)         

• [Set Session_name again to start session (correct modification mode)]

2. <?php
4. /**
6. * In- Depth understanding of PHP session control
8. * User:gutops
10. */
12. Session_name (' phpsessid_new ');
14. Session_Start ();
18. echo session_name (); // output is phpsessid_new

查看浏览器cookies，可以看到name变为PHPSESSID_NEW

How PHP session control is set correctly session_name