[Plugin Groups] Php in groups_member

Hello,
I’m sorry, but in my WordPress website, I need to do something like this :

<?php
     $premium = 0;
 ?>
 [groups_member group="Premium"]
 <?php
     $premium = 1;
 ?>
 [/groups_member]
 echo $premium."<br/>";
 if( $premium != 1){...}

Is there any solutions to make something like it ?

http://wordpress.org/extend/plugins/groups/