elgg_entity_gatekeeper($guid, $type=null, $subtype=null)
Can the viewer see this entity?
elgg_view_page($title, $body, $page_shell= 'default', $vars=[])
Assembles and outputs a full page.
elgg_extract($key, $array, $default=null, $strict=true)
Checks for $array[$key] and returns its value if it exists, else returns $default.