How to use cookies

[Berk]

Merry Meet!

Now I need some info about using cokkies.
for example I set two cookies as shown below:
$data = mysql_fetch_array($query);
setcookie("cookie_username", $data[user], mktime(0,0,0,1,1,2030));
setcookie("cookie_password", $data[password], mktime(0,0,0,1,1,2030));

now I want to recognise the user when he surfs into my website, how can I get the data which I stored into his/her computer?

Thanx All
Blessed Be!

[Weedpacket]

[man]setcookie[/man]
Once the cookies have been set, they can be accessed on the next page load with the $_COOKIE or $HTTP_COOKIE_VARS arrays. [Emphasis mine]