class User extends Item
	{
		public $last_error;
		
		function __construct($db, $query = false, $load_meta = false, $users_table = "users", $users_meta_table = "users_meta")
		{
			parent::__construct($db, $query, $load_meta, $users_table, $users_meta_table);
		}
		function __destruct() { }
		
		function create($username, $password, $email)
		{
			if (!ereg("^[A-Za-z]{1}[0-9A-Za-z]{5,11}$", $username))
			{
				$this->last_error = 501;
				return false;
			}
			if (!ereg("^(.){6,16}$", $password))
			{
				$this->last_error = 502;
				return false;
			}
			if (!ereg("^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$", $email))
			{
				$this->last_error = 503;
				return false;
			}
			$sql = "SELECT `id` FROM `{$this->tb_main}` WHERE `username` = '{$username}' LIMIT 1";
			$rs = mysql_query($sql, $this->db);
			if (mysql_num_rows($rs) > 0)
			{
				$this->last_error = 504;
				return false;
			}
			
			$sql = "SELECT `id` FROM `{$this->tb_main}` WHERE `email` = '{$email}' LIMIT 1";
			$rs = mysql_query($sql, $this->db);
			if (mysql_num_rows($rs) > 0)
			{
				$this->last_error = 505;
				return false;
			}
			
			$data = array(
				"username" => $username,
				"password" => md5($password),
				"email" => $email,
				"level" => 0);
				
			$meta = array(
				"registered" => time());
				
			return $this->insert($data, $meta, true);			
		}
	}
	
	class UserSet extends ItemSet
	{
		function __construct($db, $condition = false, $load_meta = false, $users_table = "users", $users_meta_table = "users_meta")
		{
			parent::__construct($db, $condition, $load_meta, $users_table, $users_meta_table);
		}
		function __destruct() { }
	}