[Adrian Schneider]

This should do the trick,

PHP Code:

$vbulletin->db->query_write("TRUNCATE TABLE " . TABLE_PREFIX . "session"); 


If you wanted to make it a PHP file...

logeveryoneout.php

PHP Code:

<?php

error_reporting(E_ALL ^ E_NOTICE ^ 8192);
require('./global.php');

if (!is_member_of($vbulletin->userinfo, 6)) {
    print_no_permission();
}

$vbulletin->db->query_write("TRUNCATE TABLE " . TABLE_PREFIX . "session");

echo 'Done';