class Controller
{
    public $password;
    public $number;
    public function __consruct()
    {
    }
    public function encrypt_data($sNumber, $sPassword)
    {
        // noch entschluesselung einbauen
        $this->number = $sNumber;
        $this->password = $sPassword;
    }
}
$controller = new Controller();
$controller->encrypt_data($postNumber, $postPassword);
echo "Number: " . $controller->number . "<br>";
echo "Password: "******"<br>";
// Connecting, selecting database
$mysqli = new mysqli("127.0.0.1", "user00", "password", "messenger");
/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit;
}
// Performing SQL query
$query = 'SELECT * FROM user WHERE ' . 'number=\'' . $controller->number . '\' AND password=\'' . $controller->password . '\'';
echo $query . " <br> <br> ";
if ($result = $mysqli->query($query)) {
    echo "Number of found entires " . $result->num_rows . "<br> <br>";
    /* fetch object array */