Example of session usage in php

1. Initialization (use before using session, and use one page)
Copy codeThe Code is as follows:
Session_start ();

2. Save
Copy codeThe Code is as follows:
$ _ SESSION [$ sessionName] = $ value;

(The value can be double, bool, int, array, or object data)

Example:
Copy codeThe Code is as follows:
$ _ SESSION ['loginuser'] = "zs ";

3. Retrieve the specified

Example:
Copy codeThe Code is as follows:
$ UName = $ _ SESSION ['loginuser'];

4. Delete the specified

Example:
Copy codeThe Code is as follows:
Unset ($ _ SESSION ['loginuser']);

5. Delete all sessions (delete the session file corresponding to the current browser)
Copy codeThe Code is as follows:
Session_destroy ();

6. Get session_id
Copy codeThe Code is as follows:
$ Session_id = session_id ();
$ Session_id = SID; // constant