Missing validation and database access

User.php

<?php
/**
 * User class
 * 
 * @todo Add database access and validation
 */
class User
{
    /**
     * A holder for all of the data
     */
    private $data = array();
    
    /**
     * Arrays containing settable and gettable properties
     */
    private $settable_properties = array('id', 'firstname', 'lastname', 'role', 'password', 'logins', 'pages', 'addresses');
    private $gettable_properties = array('id', 'name', 'firstname', 'lastname', 'role', 'logins', 'pages', 'addresses');

    /**
     * Constructor that accepts an array to set values swiftly.
     */
    public function __construct(array $ary = array())
    {
        foreach ($ary as $name => $value) {
            $this->$name = $value;
        }
    }

    /**
     * Generic setter with only values in $settable_properties allowed to be set.
     *
     * For other values, use $this->data[$name] whithin this object
     */
    public function __set($name, $value)
    {
        if (!in_array($name, $this->settable_properties)) {
            return false;
        }

        $this->data[$name] = $value;

        if ($name == 'firstname' || $name == 'lastname') {
            $this->data['name'] = $this->firstname . ' ' . $this->lastname;
        }

        return true;
    }

    /**
     * Generic getter allowing you to fetch only properties in $gettable_properties. 
     *
     * Other properties can only be gotten from within this object.
     */
    public function __get($name)
    {
        if (!in_array($name, $this->gettable_properties)) {
            return false;
        }

        if (array_key_exists($name, $this->data)) {
            return $this->data[$name];
        }

        return false;
    }
}

using.php

<?php

$user = new User();
$user->lastname = 'Henry';
$user->firstname = 'John';
$user->role = 'author';
$user->logins = array('john@thehenrys.com','oldjohn');

$user = new User(array('firstname' => 'John',
    'lastname' => 'Henry',
    'role' => 'author',
    'logins' => array('john@thehenrys.com','oldjohn')
);