src/Auth/Auth.php
public function logout() {
        $this->setUserId($this->guestUserId);
        $this->setUsername($this->guestUsername);
        $this->setRoleId($this->guestRoleId);
        $this->setRoleName($this->guestRoleName);
    }
public function logout() {
        $this->setUserId($this->guestUserId);
        $this->setUsername($this->guestUsername);
        $this->setRoleId($this->guestRoleId);
        $this->setRoleName($this->guestRoleName);
    }
Function to declare a user as a guess.