All elgg plugins can have access to a global variable $CONFIG. It is an object which encapsulates a wealth of information and data that comes in very handy for plugin development. It contains information on event handlers, hooks, paths, input, translation, configuration information, widgets, views, and handlers:

• event handlers

Following is a simplified print_r() of $CONFIG object.

stdClass Object
(
    [events] => Array ()
    [hooks] => Array ()
    [language_paths] => Array ()
    [translations] => Array()
    [input] => Array ()
    [dbuser] => value
    [dbpass] => value
    [dbname] => value
    [dbhost] => value
    [dbprefix] => value
    [url] => value
    [registered_tag_metadata_names] => Array ()
    [widgets] => stdClass Object ()
    [path] => value
    [viewpath] => value
    [pluginspath] => value
    [wwwroot] => value
    [sitename] => value
    [language] => value
    [db_installed] => value
    [site_id] => value
    [site_guid] => value
    [site] => ElggSite Object ()
    [dataroot] => value
    [simplecache_enabled] => value
    [viewpath_cache_enabled] => value
    [sitedescription] => value
    [siteemail] => value
    [view] => value
    [default_access] => value
    [actions] => Array ()
    [views] => stdClass Object ()
    [view_types] => Array ()
    [pluginlistcache] => Array ()
    [extender_url_handler] => Array ()
    [registers] => Array ()
    [registered_entities] => Array ()
    [pagehandler] => Array ()
    [entity_url_handler] => Array ()
    [independents] => Array ()
    [servicehandler] => Array ()
    [wordblacklist] => Array ()
)