Creating a function to logout a WordPress user?

Question

I'm trying to create a function to logout WordPress users after a period of inactivity. The timed element is working as it should and redirecting users after a set period of time.

The problem is that once the PHP script is loaded (in code sample), I run into the following error: Fatal error: Call to undefined function wp_logout() in /var/www/html/wp-content/plugins/ion-wp-login-timeout/scripts/timed-logout.php on line 5

All the reference material I read tells me that wp_logout() should log out the user but instead there are errors. I have tried several methods, including adding an action. I do not want to redirect the user to a login screen.

Sample of code is below. The echo statements are in place purely for testing. Any help would be much appreciated.

<?php

    function logout_this_session() {
        //Logout Now
        wp_logout();
        wp_die();
    }

    echo 'This will be the logout script<br/><br/>';

    $last_page = $_SERVER['HTTP_REFERER'];
    echo 'You came from: ' . $last_page;

    logout_this_session();

    header( 'Location: ' . $last_page );

?>

Answer 1

You can make your function inside functions.php

add_action( 'wp_logout', 'redirect_after_logout');
function redirect_after_logout(){
  wp_redirect( 'http://example.com' );
  exit();
}

Then put this in your desire position of your site:

<a href="<?php echo wp_logout_url(); ?>" >Logout</a>

Answer 2

This must use in init action.
You can use wp_logout() functions that logout current user.
the details of this function in wp-includes/pluggable.php file:

<?php
/**
 * Log the current user out.
 *
 * @since 2.5.0
 */
function wp_logout() {
    wp_destroy_current_session();
    wp_clear_auth_cookie();

    /**
     * Fires after a user is logged-out.
     *
     * @since 1.5.0
     */
    do_action( 'wp_logout' );
}

Answer 3

I finally figured out a solution as in code sample below. From the last stage of the process before logging out the user, I have a wpsessionexpired=true value posted back to the page the user was on. The same page is immediately refreshed after the user is logged out. I placed this within the main plugin file.

function logoutUser(){
    if ( $_POST["wpsessionexpired"] == 'true' ){ 
        wp_logout();
        header("refresh:0.5;url=".$_SERVER['REQUEST_URI']."");
    }
}
add_action('init', 'logoutUser');

Answer 4

Logout function according user role (this is a working code) copy and paste in function.php file

    function redirect_after_logout() {

        $current_user   = wp_get_current_user();
        $role_name      = $current_user->roles[0];

        if($role_name == 'subscriber'){
            $redirect_url = site_url();
            wp_safe_redirect( $redirect_url );
            exit;
        } 

    }
    add_action( 'wp_logout', 'redirect_after_logout'  );

Answer 5

this is also working for

      <?php 
if (current_user_can('client') OR current_user_can('salesrep') ){
?>
<a href="<?php echo wp_logout_url( home_url() ); ?>" class="btn btn-primary"
style="float: right;" >Logout</a>
<?php }
?>

you can set any role as your need. like is this example (client, salesrep)