Session Handling with PHP 4

Unlike PHP 3, PHP 4.0 has built-in capabilities to handle session management. The session management functionality in PHP 4.0 is easy to use, powerful and open for custom modifications. Creating sessions allows you to keep track of the actions of a particular user over the period of time she is viewing your web site. To associate session data with a user, you need a session identity number, that is, a key that ties the user to his data. This tutorial discusses how to open sessions, track session data, and clear the data when you no longer need it.