can't send cache limit cheaker and problem in back button session variable still displaying after logout and if i prees back button
<p>HI everyone</p>

<p>1.
As user enter username and password in sign-in-form.php then values are collected in sign-in-action-form.php page and the i am storing username into session variable like this
In database i have a table named employee</p>

<pre><code>&lt;a href="logout_file.php"&gt;Sign Out&lt;/a&gt;
if (username and passwords are matched)
{
session_start();
$_SESSION['employee']['id'] = $row['User_Id'];
$_SESSION['employee']['username'] =$row['Username'];
}
then on each page i am passing logout-file.php link and checking session variable like this

&lt;body bgcolor="white"&gt;
&lt;a href="logout_file.php"&gt;Sign Out&lt;/a&gt;
&lt;?php
session_start();
if(!isset($_SESSION['employee']))
{
echo "Your are Logged Out";
exit;
}
else
{
echo "Welcome Mr.".$_SESSION['employee']['username']; //check it
}
?&gt;
Body data like other links
&lt;/body&gt;
</code></pre>

<p>Now on each page i have given links like this</p>

<p>Now listen my problem
on each page i am printing
echo "Welcome Mr.".$_SESSION['employee']['username'];
So think i am on signinactionpage where there other link like show file,upload file etc..
with sign out button now as i click on sign out button i am redirected to login page(no probelm up to here)
But when i press back button (now i am logeed out) then i am again in signinaction form and Mr.Deepak.Narwal is still displaying there why so if i am looed out session destroyed and why this name is displaying..why so</p>

<p>2.
along with this one more error is displaying on each page which contain logout button and this session coading...</p>

<p>Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at E:\xampp\htdocs\upload_file.php:6) in E:\xampp\htdocs\upload_file.php on line 7</p>

<pre><code>My logout-file.php page is like this
&lt;?php
session_start();
session_unset();
session_destroy();
header ("Location: signinform.php");
?&gt;
</code></pre>
