CODE EXAMPLE FOR PHP

cookie or session authentication instead of HTTP Basic authentication makes it much easier for users to log out

if (pc_validate($_REQUEST['username'],$_REQUEST['password'])) {
    $_SESSION['login'] = 
        $_REQUEST['username'].','.md5($_REQUEST['username'].$secret_word));
    error_log('Session id '.session_id().' log in as '.$_REQUEST['username']);
}