Adding session time out

<form name="form2" method="post" action="adminloginphp.php">

  <tr align="center">
    <td height="26" colspan="2">Login Page<br />
<b><font color="#FF0000"> <?php //echo $log; ?></font></b>
    <td>Staff ID</td>
    <td><input name="staff_id" type="text" /></td>
    <td><label for="textfield">Password</label></td>
    <td><input type="password" name="staff_password" id="textfield" /></td>
    <td><input type="submit" name="button" id="button" value="Login" /></td>
    >Above is my html and below is my php.

$con = mysql_connect("localhost","root");
if (!$con)
  die('Could not connect: ' . mysql_error());

mysql_select_db("medical", $con);
$result = mysql_query("SELECT * FROM staff
WHERE staff_id='$_POST[staff_id]' and staff_password='$_POST[staff_password]'");
$log =  "Login failed";
            header("Location: http://localhost/AB%20Medical%202/adminhome.php");       //redirect them to the main page whatever your login in page is if they enter wrong   username and password

Im trying to add a session time out to my login page .But im unsure on how to do it.Here is my php login and my html.Does anyone have a simple solution to my problem.I have researched the web but all seem very complex.Plus do i need to add the session timeout in every page the admin uses or can i just have in this login page.


You can configure it on you php.ini file configuration with:

session.cookie_lifetime = X;

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