[silveryhat]

Originally Posted by csoroner

How can I run this query to find out what is limited? I have very limited experience with coding.

Let's first find out what's going on with the ctype_digit function.
Simply using notepad to make a phpinfo.php file and add this to its content

PHP Code:

<?php
phpinfo(); 
?>

Now upload it to your server and access to this file by a browser. You should see all php configuration of your server , or your account. Look for ctype function status to confirm the situation