Log out users from every where

Question

I used these code in my theme's functions.php to logout a particular user with user id 233 from everywhere in WordPress and it worked. But I want to logout all the users on my site from everywhere.

// worked for user with user id 233
$sessions = WP_Session_Tokens::get_instance($user_id=233);
$sessions->destroy_all();

I used this for all the users but did not work

// The code below did not work for all users
$sessions= WP_Session_Tokens::get_instance($user_id=users - get_current_user_id());
$sessions->destroy_all();

Answer 1

Firstly if you'd just like everyone to have to log in again you can void all of your cookies at once by changing your cookie hashes in your wordpress config file.

The lines that look like this:

define('AUTH_KEY',         ':u(rb=Ys8*2x^rVisqX(9=10a*.euPdYEBo6p_ZBB2CDG|rv~Ju)sh+6@=L6p_:l');
define('SECURE_AUTH_KEY',  '-`<iUz(4olJ`m&}1kA*{v&OX;Kq?W+!7ppF!tWb}cM<R=d<s=(oL]]04%AA@juZB');
define('LOGGED_IN_KEY',    '$KA]84n3ZT}v6m7c:r+!6l}R||)<_$3GxJ%F6Y?MopvxydJ@PRcmZ0-Hyq(EuEZt');
define('NONCE_KEY',        'qT=]!^BARWEMUD(G6]#~q$PAv-N[#^uE991w7HJNN<*mXavH)@o0TkFKVFUNIDN#');
define('AUTH_SALT',        'c W#7TWk{L1+n0A+^:|FHYL#-;*#<8U :v%>~S!45$bbYM09Iwe;@=uk^xeJd_D`');
define('SECURE_AUTH_SALT', 'h3&dgYcQE0uTaxd5bX$&1wC]yKP^?W8#q#>IJ*)ggf_Rc+6f+oZa?#JVS[HmO?=O');
define('LOGGED_IN_SALT',   '_L:n)>u>-31YK_ftTp_ZV>-y)qG)so|sOoWgYC9Ju!q_!%f.60g?I~]~lNZ6&o!0');
define('NONCE_SALT',       '.KI_*}ONxh/uwZv~!qYqOW+OL;?qvgaEqayN8>i+B.WY$e}+M9.Xqxwlf+?v 1k=');

This website is a good tool for generating new secure keys to put in.

If you want to change the amount of time you can be logged in for you can use the below code in your themes functions.php:

add_filter( 'auth_cookie_expiration', 'keep_me_logged_in_for' );

function keep_me_logged_in_for( $expirein ) {
    return 86400; // time in seconds
}

Answer 2

Try this:

$sessions = WP_Session_Tokens::get_instance( get_current_user_id() );
$sessions->destroy_all();

I don't think you have to set the variable inside of the brackets, you just need to pass the ID of the user (which is done for you by get_current_user_id function).

Here's a reference to the get_instance function, in case you haven't read it.