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User Authentication

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abhinav_shah
I have a php script for authenticating users. But there is a problem.
When a user logs in with his username and password he can access the restricted pages. But what i want to do is, if a user presses back button then the user should get logged off. I'm using php.
Here is the code for login page....

Code:
<?
session_start();
include("head.inc");
$mysql = mysql_connect("localhost","abhinavs","");
$uname = $_POST["uname"];
$pass = $_POST["pass"];
$result = mysql_db_query("abhin****","select *from pass where uname='$uname' and pass='$pass'");
$affected_rows = mysql_num_rows($result);
if($affected_rows == 1) {
      print "<h2>$uname, You are now logged in</h2>";
      $_SESSION['user_name'] = $uname;
   }

   else {
      print '<h2>Incorrect username or password. Please try logging-in again</h2>';
      include("menu.inc");
      die();
   }


http://www.abhinav.frih.net
arch23
hmm... don't know if you can identify a back button push, maybe you can.
anyway, pressing back should always get you to the same page you logged in from. so log the user off on the start of the page...
SirDuncan
hi,

why do you want to logout the user when it uses the back button ?

I suggest to check the session status at the beginning of each page, for example, checking the value of de $_SESSION['user_name'] variable. If the variable is not set properly the user is logged out

a suggestion: you can use this query:
"select count(*) from pass where uname='$uname' and pass='$pass'"
instead of "select *...."
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