UserGroups snippet for MODX Revolution (source: http://modxcms.com/forums/index.php/topic,60635.msg346266.html#msg346266)

UserGroups.php

<?php
/* UserGroups snippet*/
$user =& $modx->user;

if ($user->isMember('membres') {
     $output = $modx->getChunk('membres');
} elseif ($user->isMember('administrateurs') {
     $output = $modx->getChunk('administrateurs');
} elseif ($user->isMember('employés') {
     $output = $modx->getChunk('employés');
} else {
     $output = $modx->getChunk('offline');
}

return $output;