PCinvent Studio - Joomla 1.0 Determine User Login & User Name

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To determine user login already or not in Joomla page, here is the code that you can use.
You might also need a custom code plugin in order to insert the code into the joomla page. Search the Joomla Extension page for "Jumi" of which I recommend......

<?php
/*
* author andy <http://www.pcinvent.info>
    Please keep the above credit line to the Author
**/
defined( '_VALID_MOS' ) or die( 'Restricted access' ); // For security reasons do NOT REMOVE this line!
?>
<?php
//andy:determine user login or not and decide to redirect action
global $mainframe;
$userInfo = $mainframe->getUser();
                        if($userInfo->id == 0)
            {
            header ( "location: index.php?option=com_content&task=view&id=3&Itemid=80");//Redirect user who hasn't login yet
           }
            else
            {
             echo $userInfo->username //Output who login
            }
?>