Miért kapok mindig 1-et a num_rows-ra?

Bejelentkezést csinálom most éppen, és a num_rowsra mindig 1-et kapok.

Login:

$login = new Login($username, $password);

class Login {

protected $username;

protected $password;

protected $connection; //Database object

public function __construct($username,$password){

//set data

$this->setData($username,$password);

//connect to db

$this->connectToDB();

//get data

$this->getData();

}

protected function setData($username,$password){

$this->username = $username;

$this->password = $password;

}

protected function connectToDB(){

$this->connection = new Database();

}

protected function getData(){

$select = $this->connection->select('SELECT * FROM users WHERE felhasznalonev = ? && jelszo = ?', array($this->username,$this->password), array('%d','%d'));

if($select != 0){

return TRUE;

}else {

return FALSE;

}

}

}

A lényeg az adatbázis osztályból: (select)

class Database extends config {

public function select($query, $data, $format)

{

// Connect to the database

$db = $this->connect();

//Prepare our query for binding

$stmt = $db->prepare($query);

//Normalize format

$format = implode('', $format);

$format = str_replace('%', '', $format);

// Prepend $format onto $values

array_unshift($data, $format);

//Dynamically bind values

call_user_func_array(array($stmt, 'bind_param'), $this->ref_values($data));

//Execute the query

$stmt->execute();

//Fetch results

$stmt->get_result();

$result = $stmt->num_rows;

return $result;

}

private function ref_values($array)

{

$refs = array();

foreach ($array as $key => $value) {

$refs[$key] = &$array[$key];

}

return $refs;

}

}