encodedecode.php

    public function encodeToken($string)
    {
        return base64_encode(openssl_encrypt($string, $this->encrypt_method, hash('sha256', $this->secret), 0, substr(hash( 'sha256', $this->initialization_vector ), 0, 16)));
    }

    public function decodeToken($string)
    {
        return openssl_decrypt(base64_decode($string), $this->encrypt_method, hash('sha256', $this->secret), 0, substr(hash('sha256', $this->initialization_vector), 0, 16));
    }