How to access variables from a object in php? - php

Question

I'm following PHP Academy OOP Login/Register Tutorial currently in 16th part.
I used this code to create object in $data.
$data = $this->_db->get('users', array($field, '=', $user));
Then this code to add values from that object.
$this->_data = $data;
and trying to access the variables there by
public function data(){
return $this->_data;
}
$this->data()->password
The last code is throwing error. I tried to debug using this code
$vars = get_object_vars ($this->_data);
print_r($vars);
That is printing this line
Array ( [error] => [_requests] => Array ( [0] => stdClass Object ( [uid] => 16 [username] => admin [password] => 46651b6f1d743345d82d32da2cda7f891016ebe9f8b4416314b127e35b72fc30 [salt] => ²ê$ÓÕBF49ð®}€Æ¥A];ÛAc«íÊùÍ„s [name] => admin [joined] => 2015-03-17 22:53:52 [groups] => 1 ) ) )
What does this mean? How can I access those fields?
Here is the full code:
DB.php
<?php
/**
* Connect to database.
*
*/
class DB{
private static $_instance = null;
private $_pdo,
$_query,
$_error = false,
$_results,
$_count = 0;
private function __construct()
{
try
{
$this->_pdo = new PDO('mysql:host='.Config::get('mysql/host').';'.
'dbname='.Config::get('mysql/db'),
Config::get('mysql/username'),
Config::get('mysql/password')
);
}
catch(PDOException $e)
{
die($e->getMessage());
}
}
public static function getInstance()
{
if(!isset(self::$_instance))
{
self::$_instance = new DB();
}
return self::$_instance;
}
public function query($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->_requests = $this->_query->fetchAll(PDO::FETCH_OBJ);
$this->_count = $this->_query->rowCount();
}
else
{
$this->_error = true;
}
}
return $this;
}
public function action($action, $table, $where = array())
{
if(count($where) === 3)
{
$operators = array('=', '>', '<', '>=', '<=');
$field = $where[0];
$operator = $where[1];
$value = $where[2];
if(in_array($operator, $operators))
{
$sql = "{$action} FROM {$table} WHERE {$field} {$operator} ?";
if(!$this->query($sql, array($value))->error())
{
return $this;
}
}
}
return false;
}
public function get($table, $where)
{
return $this->action('SELECT *', $table, $where);
}
public function delete($table, $where)
{
return $this->action('DELETE', $table, $where);
}
public function insert($table, $fields = array())
{
if(count($fields))
{
$keys = array_keys($fields);
$values = '';
$x = 1;
foreach ($fields as $field) {
$values .= '?';
if($x < count($fields))
{
$values .= ', ';
}
$x++;
}
// die($values);
$sql = "INSERT INTO {$table} (`".implode('`, `', $keys)."`) VALUES ({$values})";
echo $sql;
if(!$this->query($sql, $fields)->error())
{
return true;
}
}
return false;
}
public function update($table, $id, $fields)
{
$set = '';
$x = 1;
foreach ($fields as $name => $value) {
$set .= "{$name} = ?";
if($x < count($fields))
{
$set .= ', ';
}
$x++;
}
$sql = "UPDATE {$table} SET {$set} WHERE uid = {$id}";
if(!$this->query($sql, $fields)->error())
{
return true;
}
return false;
}
public function results()
{
return $this->_results;
}
public function first()
{
return $this->results()[0];
}
public function error()
{
return $this->_error;
}
public function count()
{
return $this->_count;
}
}
user.php
<?php
class User{
private $_db,
$_data;
public function __construct($user = null)
{
$this->_db = DB::getInstance();
}
public function create($fields = array())
{
if(!$this->_db->insert('users', $fields))
{
throw new Exception("Problem Creating User Account");
}
}
public function find($user = null)
{
if($user)
{
$field = (is_numeric($user)) ? 'uid' : 'username';
$data = $this->_db->get('users', array($field, '=', $user));
if($data->count())
{
$this->_data = $data;
$vars = get_object_vars ($this->_data);
print_r($vars);
return true;
}
}
}
public function login($username = null, $password = null)
{
$user = $this->find($username);
if($user)
{
if($this->data()->password === Hash::make($password, $this->_data->salt))
{
echo "ok";
}
}
return false;
}
public function data()
{
return $this->_data;
}
}
login.php
<?php
require_once 'core/init.php';
if(Input::exists())
{
if(Token::check(Input::get('token')))
{
$validate = new Validation();
$validation = $validate->check($_POST, array(
'username' => array(
'required' => true
),
'password' => array(
'required' => true
),
));
if($validation->passed())
{
$user = new User();
$login = $user->login(Input::get('username'), Input::get('password'));
if($login)
{
echo "Success";
}
else{
echo "sorry! Failed";
}
}
else{
foreach ($validation->errors() as $error) {
echo $error, '<br />';
}
}
}
}
?>
<form action="" method="post">
<div class="field">
<label for="username">Username</label>
<input type="text" name="username" id="username" autocomplete="off">
</div>
<div class="field">
<label for="password">Password</label>
<input type="password" name="password" id="password" autocomplete="off">
</div>
<input type="hidden" name="token" value="<?php echo Token::generate(); ?>">
<input type="submit" value="Log In">
</form>

Answer 1

The variable returns array output. So you need to get values like $this->_data[0]->password, $this->_data[0]->username. Or when you store value to $this->_data, you can store the first child of the array.
instead of
$this->_data = $data;
You can use
$this->_data = $data->first();
So now you can get fields like $this->_data->username,$this->_data->password