PDO Object and Array - php

Question

I have followed PHP Academy's OOP Tutorial over here
The DB class has been made in a way to fetch database results as an Object
public function query($sql, $params=array()){
$this->_error = false;
if($this->_query = $this->_pdo->prepare($sql)){
$x=1;
if(count($params)){
foreach ($params as $param) {
$this->_query->bindValue($x, $param);
$x++;
}
}
if($this->_query->execute()){
$this->_results = $this->_query->fetchAll(PDO::FETCH_OBJ);
$this->_count = $this->_query->rowCount();
}else{
$this->_error = true;
}
}
return $this;
}
This is important cause the user login is done like this
public function login($username = null, $password = null){
$user = $this->find($username);
if($user){
if($this->data()->password === Hash::make($password, $this->data()->salt)){
Session::put($this->_sessionName, $this->data()->id);
return true;
}
}
return false;
}
Now when i want to implement foreach to get results row-wise, they are asking for an Array
$result = $product->getData($_GET['id']);
if(!empty($result)){
foreach ($result as $row) {echo $row['id'];}}
getData Function
public function getData($_id){
return $this->_db->get('products', array('id', '=', $_id))->results();
}
results function is in DB class
public function results(){
return $this->_results;
}
When I change Fetch All to get Both OBJ and ARRAY, User cant log in.
What should i do? Which function to change?
Sorry for Bad English
Thanks in Advance