MODX snippet. It checks if the resource has siblings and outputs two different classes onto an HTML element such as a div

haveSiblings

//[[haveSiblings? &classtwo=`no_sub_menu` &classone=`with_sub_menu`]]

<?php
if(!isset($modx)) return '';

/* setup vars */
$exclude = !empty($exclude) ? (is_array($exclude) ? $exclude : explode(',', str_replace(' ', '', $exclude))) : null;
$id = $modx->resource->get('id');
if(!is_null($exclude) && in_array($id, $exclude)) return '';

$output = '';
$parents = $modx->getParentIds($id);
$parentCount = count($parents);
$parent = array_shift($parents);
$childCount = count($modx->getChildIds($id));

/* get submenu */
if($parentCount > 1 || $childCount > 0)
{
  
	if($parentCount > 1 && $childCount > 0)
	{
		$output .= $classone;
	
	}
	elseif($parentCount > 1 && $childCount == 0)
	{
		$output .= $classone;
	
	}
	elseif($parentCount == 1 && $childCount > 1)
	{
		$output .= $classone;
            
		
	}	
}
else{

$output .=$classtwo;

}
return $output;