SimpleSoftwareIO\QrCode\DataTypes\Email::buildEmailString PHP Метод

    protected function buildEmailString()
    {
        $email = $this->prefix . $this->email;
        if (isset($this->subject) || isset($this->body)) {
            $data = ['subject' => $this->subject, 'body' => $this->body];
            $email .= '?' . http_build_query($data);
        }
        return $email;
    }