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6 comments

  2. The following code does the job for automatic login, without any password!

    // Automatic login //
$username = "Admin";
$user = get_user_by('login', $username );

// Redirect URL //
if ( !is_wp_error( $user ) )
{
    wp_clear_auth_cookie();
    wp_set_current_user ( $user->ID );
    wp_set_auth_cookie  ( $user->ID );

    $redirect_to = user_admin_url();
    wp_safe_redirect( $redirect_to );
    exit();
}

  3. I have found another solution here that uses a better approach (at least in my opinion…).
    No need to set any cookie, it uses the WordPress API:

    /**
 * Programmatically logs a user in
 * 
 * @param string $username
 * @return bool True if the login was successful; false if it wasn't
 */
    function programmatic_login( $username ) {
        if ( is_user_logged_in() ) {
            wp_logout();
        }

    add_filter( 'authenticate', 'allow_programmatic_login', 10, 3 );    // hook in earlier than other callbacks to short-circuit them
    $user = wp_signon( array( 'user_login' => $username ) );
    remove_filter( 'authenticate', 'allow_programmatic_login', 10, 3 );

    if ( is_a( $user, 'WP_User' ) ) {
        wp_set_current_user( $user->ID, $user->user_login );

        if ( is_user_logged_in() ) {
            return true;
        }
    }

    return false;
 }

 /**
  * An 'authenticate' filter callback that authenticates the user using only     the username.
  *
  * To avoid potential security vulnerabilities, this should only be used in     the context of a programmatic login,
  * and unhooked immediately after it fires.
  * 
  * @param WP_User $user
  * @param string $username
  * @param string $password
  * @return bool|WP_User a WP_User object if the username matched an existing user, or false if it didn't
  */
 function allow_programmatic_login( $user, $username, $password ) {
    return get_user_by( 'login', $username );
 }

    I think the code is self explanatory:

    The filter searches for the WP_User object for the given username and returns it.
    A call to the function wp_set_current_user with the WP_User object returned by wp_signon, a check with the function is_user_logged_in to make sure your are logged in, and that’s it!

    A nice and clean piece of code in my opinion!

  4. This works well for me:

      clean_user_cache($user->ID);
  wp_clear_auth_cookie();
  wp_set_current_user($user->ID);
  wp_set_auth_cookie($user->ID, true, false);
  update_user_caches($user);

  5. In addition to Mike, Paul and Sjoerd:

    To better handle login.php redirections:

    //---------------------Automatic login--------------------

if(!is_user_logged_in()){

    $username = "user1";

    if($user=get_user_by('login',$username)){

        clean_user_cache($user->ID);

        wp_clear_auth_cookie();
        wp_set_current_user( $user->ID );
        wp_set_auth_cookie( $user->ID , true, false);

        update_user_caches($user);

        if(is_user_logged_in()){

            $redirect_to = user_admin_url();
            wp_safe_redirect( $redirect_to );
            exit;
        }
    }
}
elseif('http://' . $_SERVER['HTTP_HOST'] . $_SERVER['SCRIPT_NAME'] == wp_login_url()){

    $redirect_to = user_admin_url();
    wp_safe_redirect( $redirect_to );
    exit;
}

    To be placed in wp-config.php just after

    require_once(ABSPATH . 'wp-settings.php');

    FYI

    Based on the above solution, I have released a plugin to keep the user logged in from one wordpress to another by synchronizing user data and cookie session:

    https://wordpress.org/plugins/user-session-synchronizer/

  6. Strange enough but the only way it works for me is if I redirect and die() after:

    clean_user_cache($user->ID);
wp_clear_auth_cookie();
wp_set_current_user( $user_id, $user->user_login );
wp_set_auth_cookie( $user_id, true, true );
update_user_caches( $user );

if ( is_user_logged_in() ) {

    $redirect_to = $_SERVER['REQUEST_URI'];
    header("location:".$redirect_to );
    die(); 

}