Nefunguje mysql_fetch_array

class db {

	var $server;
	var $user;
	var $password;
	var $database;

		function connect() {
			$this->spojeni = mysql_connect($this->server, $this->user, $this->password);
			$this->query("SET NAMES `utf8`");
		}

		function close() {
			mysql_close();
		}
		function query($qry) {
			return mysql_db_query($this->database , $qry, $this->spojeni) or die(mysql_error());
		}
		function fetch_query($qry) {
			$qr2 = mysql_db_query($this->database , $qry, $this->spojeni) or die(mysql_error());
			return mysql_fetch_row($qr2);
		}

}

class sys {

		function userslist($limit1=0,$limit2=30) {
			global $db;
			return $db->query("SELECT * from `users` LIMIT ".$limit1.", ".$limit2);
		}
		
}

while($userprint = mysql_fetch_array($sys->userslist())) {
	echo $userprint['username'];
}

class sys {

		function __construct($server,$user,$password,$database) {
			mysql_connect($server, $user, $password);
			mysql_select_db($database);
			mysql_query("SET NAMES `utf8`");
		}

		function __destruct() {
			mysql_close();
		}

		function fetch($qry) {
			$fer=mysql_query($qry) or die(mysql_error());
			return mysql_fetch_row($fer);
		}
		function userslist($limit1=0,$limit2=30) {
			$mfq = mysql_query("SELECT * from `users` LIMIT ".$limit1.", ".$limit2);
			for($i=0; $userprint=mysql_fetch_array($mfq); $i++) {
				$retuser[$i]=$userprint;
			}
			return $retuser;
		}
		
}
foreach ($sys->userslist() as $value) {
    echo ">".$value['username']."<<br>";
}