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+--- Thread: How to count logged in users? (/showthread.php?tid=77400)
How to count logged in users? - valema - 08-27-2020
Hello. I'm using session to have logged in users, and have set CI (3) to store those in database.
I was thinking (half as a scenario) that I want to replace files in the running system, and want to check if there are anyone logged in to the system. If there is, I would wait and check again - until none is logged in (except maybe me). Is there a way to count logged in users?
RE: How to count logged in users? - php_rocs - 08-27-2020
@valema,
When a user logs in do you store (in the database) any flags or data that documents when if if a user is logged in? If so, then all you would need to do is simply query the database to tell you when a user(s) is logged in.
RE: How to count logged in users? - valema - 08-27-2020
@php_rocs thanks for replying. No, just Id and username (in session). I see I can for example have a column in the user table "logged_in" that can be int and 0 means no 1 means yes. Or have a column "last_logged_in" datetime and "last_logged_out". But if user forgets to log out or close browser without logging out?
RE: How to count logged in users? - php_rocs - 08-27-2020
@valema,
You can approach this many different ways. You could determine if the session is still active and if not then automatically close out the user. You could have a feature that determines if the user is still active and if not then it automatically logs them off. And there are other things you can do as well.
RE: How to count logged in users? - valema - 08-28-2020
Well. I once tried to find in the sql-select-result from CI_sessions when a user was logged out... but didn't grasp (it). Now I wonder must I use CI session-helper or is it OK to use php's $_SESSION, in order for all needed info to be stored in the CI_sessions table... I also wonder if the "state" (logged_in or not) of a user can be globally recognised, or if it's read with help of users cookies.
RE: How to count logged in users? - InsiteFX - 08-28-2020
Have a helper return the logged in state, you can make the helper global by placing it in
commom.php
PHP Code:
function loggedIn()
{
return ($_SESSION['loggedIn'] == true) ? true : false;
}
Or whatever you are using for the users state.
RE: How to count logged in users? - php_rocs - 08-28-2020
@valema,
Did you read the documentation (https://codeigniter.com/userguide3/libraries/sessions.html#session-library)? Maybe it can help you to grasp it. The CI session is what I have used in all of my built CI web applications.
RE: How to count logged in users? - valema - 08-31-2020
Thanks for the answers. I read on CI userguide this example:
$newdata = array(
'username' => 'johndoe',
'email' => '[email protected]',
'logged_in' => TRUE
);
$this->session->set_userdata($newdata);
How would it be retrieved,
1. in code / not "global" - is it array - by which name? It seems it would be ok with $_SESSION['username'], $_SESSION['email'], $_SESSION['logged_id'], conclusion-1: this "SESSION" could be read only by a certain user... otherwise through database.
2. In the database - how would the three (key/values) be associated - aha they are at one/same row in db right...
conclusion-2: the values are associated being at one/same line.
I was reading select-result from ci_sessions before logging in and after (logging out) - nothing was added, but I have this error now:
A PHP Error was encountered
Severity: Warning
Message: session_regenerate_id(): Cannot regenerate session id - session is not active
Filename: models/X_model.php
Line Number: --
After "logging out"
Anyway - a first step is to have "logged_in" session variable.
My log in function have
(reading from user table)
$_SESSION["user_name"] = $email;
$_SESSION["user_id"] = base64_encode($row->id);
log out function have
$_SESSION["user_id"] = 0;//test, för det loggades ej ut i Opera 58.0.3135.79
session_unset();
session_destroy();
session_write_close();
setcookie(session_name(), '', 0, '/');
(so it wouldn't fit here to put $_SESSION["logged_in"]=false , because all session/cookies are cleared)
RE: How to count logged in users? - InsiteFX - 08-31-2020
To retrieve session data:
PHP Code:
$logged_in = $_SESSION['logged_in'];
// or:
$logged_in= $session->logged_in;
// or:
$logged_in = $session->get('logged_in');
// or session helper
$logged_in = session('logged_in');
// Or to get it all in an array
$data = $_SESSION;
// or:
$data = $session->get();
I prefer to use the session helper makes things easy.
PHP Code:
// Session helper
$logged_in = session('logged_in');
// or you call the other metods like so
$logged_in = session()->get('logged_in');
$logged_in = session()->set('logged_in', true);
The session helper makes it easier to read the code to me.