I'm new to PHP and was wondering if there's any better way of retrieving the records from the query other than using an array (This query will only return 1 row):

$auth = mysql_query("SELECT username, userlevel, password, email FROM users WHERE id = '".$_SESSION['uid']."'");
while ($row = mysql_fetch_array($auth))
{
$password = $row['password'];
}



Also, can anyone tell me what the relevance of adding '!' is to an if statement eg.


This:
if(!isset($_SESSION['uid']))

Instead of this:
if(isset($_SESSION['uid']))


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