Bluz\Session\Session::setName PHP Method

    public function setName($name)
    {
        if ($this->sessionExists()) {
            throw new SessionException('Cannot set session name after a session has already started');
        }
        if (!preg_match('/^[a-zA-Z0-9]+$/', $name)) {
            throw new SessionException('Name provided contains invalid characters; must be alphanumeric only');
        }
        $this->name = $name;
        session_name($name);
        return $this;
    }