It is always possible to check if the user is logged in as admin using the drupal built in user_access() function, super administrator account doesn't have a role by default so you can check it using :

<?php
if(user_access('administer')) 
{....your code goes here....}
?>

However, in case if you want to check whether the logged-in user has a certain role. For example, something like this if you have a role called 'moderator'

<?php
global $user;
if(is_array($user->roles) && in_array('moderator', $user->roles))

{... your code goes here ...}

?>