The above modification simply prevents registrations for two conditions:
a) the board language is not english
b) the
website hosting field is not empty
Using this script will stop anyone from registering if any of the above conditions apply.
You will need to edit the phpBB file /includes/usercp_register.php to add this modification.
SMF is worse than phpBB, especially since phpBB 3 is now in the RC stage.