Destroy a session in codeigniter and start a new one

In CodeIgniter, you can destroy a session and start a new one using the following methods:

Destroying a session:

You can use the unset_userdata() function to destroy a session variable. For example:

$this->session->unset_userdata('username');

This will remove the username session variable.

Alternatively, you can use the destroy() function to destroy the entire session:

$this->session->destroy();

This will remove all session variables and destroy the session.

Starting a new session:

After destroying the session, you can start a new one by calling the sess_create() function:

$this->session->sess_create();

This will create a new session and set the session ID.

Note: If you want to start a new session without destroying the old one, you can use the sess_create() function without destroying the old session.

Example:

// Destroy the old session
$this->session->destroy();

// Start a new session
$this->session->sess_create();

// Set a new session variable
$this->session->set_userdata('new_username', 'new_user');

In this example, the old session is destroyed, and a new session is created. Then, a new session variable new_username is set.

Also, you can use the sess_regenerate() function to regenerate the session ID, this will create a new session ID and destroy the old one.

$this->session->sess_regenerate();

This function is useful when you want to regenerate the session ID without destroying the session variables.

Please keep in mind that the above examples are for CodeIgniter 2.x and 3.x, the syntax might be different for CodeIgniter 4.x.