Force user to logout session PHP
I can't seem to find a straightforward answer to this question. Is there a way in which I can force a logged in user to logout? My login system essentially just relies on a session containing the user's unique ID (which is stored in a mysql database). So essentially just...
if (isset($_SESSION['user_id'])) {
echo "You're logged in!";
} else {
echo "You need to login!";
}
But let's say I want to ban this user, well I can change their status to banned in my database but this won't do anything until the user logs out and attempts to log back in... So, how do I force this user to logout? Preferably without checking every single time they view a page whether or not their status has been switched to "banned" because that seems like unnecessary stress on my server. Any help is appreciated, thank you.
Answer
Either you need to check every time they load a page, or possibly look at an Ajax call at set intervals to check their status from the DB.
Then you can use session_destroy(); to end their session. This will destroy their entire session.
Otherwise you can use unset($_SESSION['user_id']); to unset a single session variable