Parse error: syntax error, unexpected 'exit' (T_EXIT), expecting ',' or ';' in admin\db\connect.php on line 23

<?php
ob_start();
session_start();
?>


<?php


$dbserver="localhost";
$dbuser="root";
$dbpass="usbw";
$dbname="linklist";



$connect=mysql_connect($dbserver,$dbuser,$dbpass);
mysql_query("SET NAMES UTF8");
if(!$connect)
{
mysql_close($connect);
echo "Can't connect MySQL server."
    exit();
}


$db=mysql_select_db($dbname);
if(!$db) { echo "Database error:",mysql_error(); echo "<br>";

echo "Database error";


    exit();


      }
?>

{
mysql_close($connect);
echo "Can't connect MySQL server."
    exit();
}