PHPBuilder - Custom Session Handlers in PHP4 Page 5



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Custom Session Handlers in PHP4 - Page 5

by: Ying Zhang
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July 30, 2000

Our 6 functions will now work against a MySQL database:
  1. sess_open($sess_path, $session_name);
    We need to connect to the MySQL database here using mysql_pconnect(), and then selecting the session database using mysql_select_db(). The $sess_path and $session_name parameters are irrelevant but we have to keep them.

  2. sess_close();
    We are opening a persistent connection to MySQL so we don't do anything in this function.

  3. sess_read($key);
    A simple SELECT statement will do the trick, we want to read the session data for the given key, and we can specify that the expiry timestamp must be in the future.

  4. sess_write($key, $val);
    Writing a session is a little bit trickier. We first try to save the session into the database using an INSERT statement. If that fails (from a Primary Key constraint) then that means the key already exists, so then we have to write an UPDATE statement instead.

  5. sess_destroy($key);
    Destroying a session is easy, we just delete the session key from the database.

  6. sess_gc($maxlifetime);
    Garbage collection is easy as well, we just have to delete all the expired sessions (where the expiry timestamp is in the past) from the database.

Now we've got a MySQL session handler, pretty easy wasn't it?

Conclusion

This concludes this little tutorial, hopefully you have a good feel for how to extend the session handling functions in PHP4. The examples here are just simple ones to demonstrate how you would do it, extend them to accomodate your needs and if you find any bugs, please let me know :)

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