Редирект при авторизации, как сделать?

<?php

    if( ! defined( 'DATALIFEENGINE' ) ) {
        die( "Hacking attempt!" );
    }
    [b]if( $is_logged ) {
        header( "Location: {$_SERVER['PHP_SELF']}" );[/b]
    } else {
        $tpl->load_template( 'login_page.tpl' );
        $tpl->set( '{registration-link}', $PHP_SELF . "?do=register" );
        $tpl->set( '{lostpassword-link}', $PHP_SELF . "?do=lostpassword" );
        $tpl->set( '{login-method}', $config['auth_metod'] ? "E-Mail:" : $lang['login_metod'] );
        $tpl->copy_template = "<form  method=\"post\" action=\"\">\n" . $tpl->copy_template . "
<input name=\"login\" type=\"hidden\" id=\"login\" value=\"submit\">
</form>";
        $tpl->compile( 'content' );
        $tpl->clear();
    };

?>