我怎么能完全破坏会话。 如果会话不可用则重定向到登录页面

Hello i am trying to destory session when i press signout button then it's logging out and redirecting to login page; but when click back in browser that page is loading with loign menu on top.

And i have wrote a code in everypage as if session not available redirect to login page.

Here is my logout code for session_destroy:

elseif(isset($_GET['type']) && $_GET['type']== "logout" )
{
    if (!isset($_SESSION['id'])) {
        header('location:index.php');
        } else {
        session_destroy();
        $_SESSION = array(); 
        header('location:index.php');
    }
}

here is the code what i have mentioned in all pages:

session_start();
include_once('includes/config.php');
if(!isset($_SESSION['id'])) {
    header('location:login.php');
}

So my question is completly logout if press back it should not load and has to redirect to login page.

<?php
session_start();
if($_SESSION['id']){
unset($_SESSION['id']); // destroys the specified session.

}

header('Location:index.php'); //redirect to preferred page after unset the session

?>

Try in this way :

session_start();

unset($_SESSION["id"]);

session_destroy();
header('location:index');

session_destroy() 

By this function you can destroy all session at browser. If you work with php you should write :

    ob_start (); 
session_start();

By this your buffer also flush and new start session. Try with it.

Create a page like signout.php, And set signout button link to this page.

Example

<a href="signout.php">Signout</a>

Add below codes for signout.php page.

session_start();   #Start new or resume existing session
#session_unset($_SESSION['key']); #Free specific session variable if you want, OR
session_destroy(); #Destroys all data registered to a session
header('location:login.php'); #Redirect to login page after logout

This should work for you!