public function generateToken($email){
        $token = bin2hex(openssl_random_pseudo_bytes(32));
        $this->verifyToken($email, $token);
    }

    public function verifyToken($email, $token){
        $stmt ... ;

        if($result != 1){
            $stmt ... ;

            return $token;
        }else{
            $this->generateToken();
        }
    }