PHP and MySQL

15.5    Sessions in Databases

Although PHP's session handling really has a good reputation, there are scenarios in which separate session management makes sense. Imagine, for example, that you want to collect data during a session and store it in a database; you also want the session itself to be kept in a database. In such cases, PHP allows you to take care of session data management yourself. The corresponding PHP function is called session_set_save_handler():

bool session_set_save_handler(callback open, callback close, callback read,   callback write, callback destroy, callback gc)  

The six parameters have the following meanings:

• openOpen the session

• closeClose the session

• readRead session data

• writeWrite session data

• destroyDestroy ...