The idea I did have though, instead of putting (int) [update_option('woopra_website_id', (int) $_POST['websiteid']);] in the update option, I was going to suggest to Elie an "is_int" check.

if (is_int($_POST['websiteid']))
{
update_option('woopra_website_id', $_POST['websiteid']);
}
else
{
... error code ...
}

This way it checks the string directly and would not mess up the database and a much safer choice. (int) is tricky as it sometimes can't process very high numbers and a database INT field can only support 11 numbers. As we expand, you will see that there are more then 11 million people who might want this tool.

Your "siteid" is really not that long. Just the server ID and the site key are combined and we do a math operation to get the server ID and site ID when processing stats so you don't have to enter two numbers.