Related by taxonomy php views argument

if (arg(0) != 'node') {
  return;
}
$node = node_load(arg(1));
$tids = array();
$vid = 2; // this is the vocabulary id to search through...
$terms = taxonomy_node_get_terms_by_vocabulary($node, $vid);  
foreach($terms as $term){
	$tids[] = $term->tid;
	}
return implode('+',$tids);