Problema con Simple vB User login and access control on non vB pages

-----
USAGE
-----

This hack is pretty useless without some usage instructions so here they are.
We can use conditionals to hide or display depending on a number of things such as 
Logged in or out status,
or restrict to members of a specific usergroup.

We do this by using conditionals in php tags where the normal content of a webpage would go.


* If you want something only accessable to a certain usergroup, use this code in your webpage. This example is only visible to members of usergroup 6.
 
<?php
if ($vbulletin->userinfo['usergroupid'] == '6' )
    {
    echo "This is only visible to people in usergroup 6";}
    ?>
 


* You can use a simple variation of this to restrict entire pages to a certain usergroup.
For example,
  
<?php
if ($vbulletin->userinfo['usergroupid'] == '6' )
    {
    echo "Have stuff for here";
             } else {
             echo "You do not have permission for this page"; }
    ?>
 


* Another use is to display different content to users depending on if they are logged in or not. For example

<?php
If ($vbulletin->userinfo['userid']!=0)
    {    
    echo "Your logged in so we can display this";
    } else {
    echo "Your not logged in so we display this";
    }
?>    

 

* Another use is to restrict advertising to people who are not logged in. For example 

<?php 
if ($vbulletin->userinfo['userid'] <1) { echo"add code stuff goes here"; } 
?> 


Of course you can play around with conditionals to do a whole range of things, these are just brief example snippets