$sql = mysql_query("SELECT id FROM account WHERE Username='$Username' AND Password='$md5Password' LIMIT 1");
$userCount = mysql_num_rows($sql);
เปลี่ยนเป็น
Code (PHP)
$sql = "SELECT id FROM account WHERE Username='$Username' AND Password='$md5Password' LIMIT 1";
echo $sql;
$query = mysql_query($sql) or die(mysql_error());
$userCount = mysql_num_rows($query);