How can I execute a different code in my plugin depending on if the user is logged in or not in Joomla? Basically I want to do this:
<?php if (loggedin) { // Do something } else { // Do something else } ?> 
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3 Answers
I usually do something like this:
<?php $user = JFactory::getUser(); if ($user->guest) { // User is not logged in } else { //User is logged in } ?> Take a look at the Joomla Documentation.
You can either use this:
$user = JFactory::getUser(); if($user->id != 0) { // you are a member } else { // you are a guest } or this:
$user = JFactory::getUser(); if($user->guest) { // you are a guest } else { // you are a member } Bother are the same with most likely nano seconds in performance, in regards to speed.
Besides the direct programmatic method to conditionally show different contents (JFactory::getUser()->guest), there's an alternative to create a Guest group to identify this specific set of users; in this way, the content can be managed either at the CMS level with the regular administrative tools or in a plugin with Access Control List controls:
How do you hide something from logged in users? http://docs.joomla.org/How_do_you_hide_something_from_logged_in_users%3F
Associated routine to check if the user belongs to the Guest group:
$user = JFactory::getUser(); $groups = JAccess::getGroupsByUser(user->id, false); if (in_array(MY_GUEST_GROUP, $groups)) { echo 'Only visible for guests'; } 