30     action(
"$plugin_id/settings/save");
 
if(!($plugin instanceof ElggPlugin)) $plugin_name
 
elgg_action_exists($action)
Check if an action is registered and its script exists.
 
elgg button elgg button action
 
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_get_plugin_from_id($plugin_id)
Returns an \ElggPlugin object with the path $path.
 
elgg_echo($message_key, $args=array(), $language="")
Given a message key, returns an appropriately translated full-text string.