How can you reset a session in PHP?

Resetting a session in PHP can be effectively accomplished using the session_destroy() function. This function is designed to completely terminate the session and remove all session data associated with it on the server. When you invoke session_destroy(), it effectively clears the session data, and all the variables stored in the $_SESSION superglobal are no longer available.

Once a session is destroyed, if you want to start a new session or maintain existing data in a different way, you would typically call session_start() afterward to create a new session ID. This can be useful when you want to clear the currently set session as well as any associated data and begin fresh. It's important to note that simply destroying a session does not automatically unset the $_SESSION array; thus, if you want to retain or modify certain session variables, you'd manage that separately.

Using unset($_SESSION) only removes specific session variables but does not destroy the session itself. Although session_reset() is a valid function, it does not reset the entire session but rather resets the session variables to their initial state, which is different from fully destroying and then starting a new session. Therefore, for a complete session reset, session_destroy() is the appropriate choice.