WordPressのワンクリックで他のユーザーIDに切り替わるログイン機能方法

/** 
* WordPress admin backend password-free one-click switch to other account login 
*/ 
function wpdx_user_switch_action($actions, $user){
    $capability = (is_multisite())?' manage_site':'manage_options';
    if(current_user_can($capability)){
        $actions['login_as'] = '<a title="Login with this identity" href="'.wp_nonce_url(" rel="external nofollow" users.php? action=login_as&users=$user->ID", 'bulk-users').' ">Log in as this</a>';
    }
    return $actions;
}
add_filter('user_row_actions', 'wpdx_user_switch_action', 10, 2);

function wpdx_handle_user_switch_action($sendback, $action, $user_ids){
    if($action == 'login_as'){
        wp_set_auth_cookie($user_ids, true);
        wp_set_current_user($user_ids);
    }
    return admin_url();
}
add_filter('handle_bulk_actions-users','wpdx_handle_user_switch_action', 10, 3);