Introduction to Session Management in PHP4
This chapter introduces you to session management using PHP4's built-in session management techniques.
Session management allows you to track variables associated with a user for a specific Web session. A Web session is the time that a user spends on pages on your site using the same browser instance. If the user closes the browser (or you explicitly end the session), then the session variables are no longer associated with that user, unless you provide for a way that the variables can be saved and later reassociated with the user.
Sessions are typically tracked by PHP by placing a cookie on the user's browser. The cookie references a session ID, which you can view in your scripts by calling the $PHPSESSID ...
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