Forces a login into vBulletin (4.x) using just a username

vBulletinUser.php

<?php
class vBulletinUser{
	public static function login($username, $remember_me = false){
		chdir(VB_ROOT_PATH);
		require_once('./global.php');
		require_once(DIR . '/includes/functions_login.php');
		global $vbulletin,$vbphrase;
		$remember_me = $remember_me ? true : false;	//force to true or false value
		$vbulletin->userinfo = $vbulletin->db->query_first("SELECT userid, usergroupid, membergroupids, infractiongroupids, 
			username, password, salt FROM ".TABLE_PREFIX."user WHERE username = '".
			$vbulletin->db->escape_string(htmlspecialchars_uni($username))."'");
			
		if ($vbulletin->userinfo){
			process_new_login($vbulletin->GPC['logintype'], $remember_me, $vbulletin->GPC['cssprefs']);
			exec_shut_down();
			return true;
		}
		return false;
	}
}
?>