User.php

<?php
class User {
	private $_db,
			$_data,
			$_sessionName;

	public function __construct($user = null) {
		$this->_db = DB::getInstance();

		$this->_sessionName = Conig::get('session/session_name');
	}

	public function create($fields = array()) {
		if (!$this->_db->insert('users', $fields)) {
			throw new Exception('There was a problem creating an account.');
		}
	}

	public function find($user = null) {
		if ($user) {
			$field = (is_numeric($user)) ? 'id' : 'username';
			$data = $this->_db->get('users', array($field, '=', $user));

			if ($data->count()) {
				$this->_data = $data->first();
				return true;
			}
		}
		return false;
	}

	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();
			}
		}

		return false;
	}

	private function data() {
		return $this->_data;
	}
}