How can a PHP session be completely deleted?

To completely delete a PHP session, you can use the session_unset() function to remove all session variables and then use the session_destroy() function to destroy the session data and the session cookie. 

session_start();

// Unset all session variables
$_SESSION = array();

// Destroy the session
session_destroy();

// Delete the session cookie
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]
    );
}

Keywords

PHP session unset destroy cookies

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