Is it possible to check if a user is currently logged into the community with an external php page through $_SESSION or something like that?

Yes. If you include the init.php from the forum after that like this.

 

<?php
/* Require the init.php file from the Community Suite root directory */
require 'init.php';

/* Initiate the session to verify who this user is */
\IPS\Session\Front::i();

echo \IPS\Member::loggedIn()->name;
?>

After you include the init.php you can use most of the forum function 😄 

Actually, I would recommend using \IPS\Dispatcher\External::i(); rather than \IPS\Session\Front::i();

4 hours ago, Ryan Ashbrook said:

Actually, I would recommend using \IPS\Dispatcher\External::i(); rather than \IPS\Session\Front::i();

Just for my info, could you explain the difference between the two? 

Thanks fellas works perfectly 😀

On 3/23/2019 at 5:44 PM, Tom S. said:

Just for my info, could you explain the difference between the two? 

The external dispatcher sets up a few things under the premise that you're executing code but not within the Suite itself (using the framework, but in a standalone script). This is safer than simply loading the session handler, which may rely on other classes).

Consider it a best practice tip.