register_error($error)
Display an error on next page load.
system_message($message)
Display a system message on next page load.
forward($location="", $reason='system')
Forward to $location.
elgg_echo($message_key, $args=array(), $language="")
Given a message key, returns an appropriately translated full-text string.
elgg_instanceof($entity, $type=null, $subtype=null, $class=null)
Checks if $entity is an ElggEntity and optionally for type and subtype.
get_entity($guid)
Loads and returns an entity object from a guid.