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Global variables in EmonCMS

Global variables can be declared in new modules, for example:

global $mysqli, $session;

There are many globals available, here we describe the more relevant ones.

$mysqli

Object that connects to EmonCMS database. It is an instance of the php class mysqli. You can see how to use it the php documentation: http://php.net/manual/en/class.mysqli.php

$redis

Redis is an in-memory database (MySQL is in-disk). $redis is used to reduce the write load to the database. Anybody how can do this section??

$route

Object that is an instance of the class Route. This class is defined in route.php Once the URL is decoded in index.php the $route object properties are set. For the following URL:

http://server/controller/action.subaction.format?attribute=blabla

The $route properties are:

$route->controller = controller
$route->action = action 
$route-> subaction = subaction
$route-> format = format

$session

Associative array that stores info about permissions after a user or a node has authenticated. $session['userid']: the session has been started by this user or a node that belongs to him/her

  • $session['read'] session with read privileges (1 for true, 0 for false)
  • $session['write']: session with write privileges (1 for true, 0 for false)
  • $session['userid']: id of the user that has started the session (it can be logged in with the web browser or with the API key in the query string from a node request)
  • $session['username']: the name of the user that has started the session
  • $session['admin']: session with admin privileges (1 for true, 0 for false)
  • $session['editmode']: I don't know what it is for and i haven't been able to find any usage
  • $session['lang']: language to be used, useful for the html output;

$user

Object that is an instance of the class User. This class is defined in Modules/user/user_model.php This global variable is useful if you need to deal with: user login, user authentication, set/get user info like username, id, apikeys, email, language or timezone.

To know everything you can do using its methods, have look at the model.