Usergroup membership check

gistfile1.txt

<?php
/**
 * Checks current users group membership
 *
 * @var modX $modx
 * @var array $scriptProperties
 */
/* set default properties */
$usergroup = $modx->getOption('usergroup',$scriptProperties);
$sendError = $modx->getOption('sendError',$scriptProperties) == 1 || null;
$group = array();

$member = ($modx->user->isMember($usergroup)) ? 1 : 0;
$group[$usergroup] = $member;
$modx->setPlaceholders($group, 'ugroup.');

if ($sendError && $member === 0 ) { $modx->sendErrorPage(); }

return '';

//usage in modx template or chunk
//snippet call sets the placeholder
[[!ugroupCheck? &usergroup=`myGroup`]] //snippet call

//conditional output
//https://docs.modx.com/current/en/building-sites/tag-syntax/output-filters
[[!+ugroup.myGroup:eq=`1`:then=`
  <button id="create_srv_btn" class="btn btn-success">Add New Survey</button>
`]]