I'm pretty new to PHP and I am trying to figure out how to use sessions to check and see if a user is logged into a website so that they would have authorization to access specific pages.
Is this something that is complicated or is it because I am a noob that I can't figure it out?
If you have two PHP applications on a webserver, both checking a user's login status with a boolean flag in a session variable called 'isLoggedIn', then a user could log into one of the applications and then automagically gain access to the second without credentials.
Right-click the taskbar, then select “Task Manager“. Select the “Users” tab. Details on the users logged into the machine are displayed.
Logins are not too complicated, but there are some specific pieces that almost all login processes need.
First, make sure you enable the session variable on all pages that require knowledge of logged-in status by putting this at the beginning of those pages:
session_start();
Next, when the user submits their username and password via the login form, you will typically check their username and password by querying a database containing username and password information, such as MySQL. If the database returns a match, you can then set a session variable to contain that fact. You might also want to include other information:
if (match_found_in_database()) { $_SESSION['loggedin'] = true; $_SESSION['username'] = $username; // $username coming from the form, such as $_POST['username'] // something like this is optional, of course }
Then, on the page that depends on logged-in status, put the following (don't forget the session_start()
):
if (isset($_SESSION['loggedin']) && $_SESSION['loggedin'] == true) { echo "Welcome to the member's area, " . $_SESSION['username'] . "!"; } else { echo "Please log in first to see this page."; }
Those are the basic components. If you need help with the SQL aspect, there are tutorials-a-plenty around the net.
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