nastavenie db serveru

function connectDb($dbName){
   if($dbName=='a')$dbName='a_sk';
   
   $dbserv='/tmp/mysql50.sock';
   $dblog='a_sk';
   $dbpass='r';
   if (!($link = mysql_connect ($dbserv, $dblog, $dbpass))) {   //overenie spojenia
      echo ' -please sorry->try again later';
   }
   $selectdb=mysql_select_db($dbName);   
   @mysql_query("SET NAMES UTF8");
}

$db_username = "username";
$db_password = "password";
$db_server = "localhost";
$db_socket = ":/tmp/mysql50.sock";

$conn = mysql_connect($db_server.$db_socket, $db_username, $db_password);