Как сделать подпись автора под материалом?

$tpl->set( '{signature}', $row['signature'] );

if( $row['signature'] ) {
    $tpl->set( '[signature]', "" );
    $tpl->set( '[/signature]', "" );
    $tpl->set( '{signature}', $row['signature'] );
    $tpl->set_block( "'\\[not-signature\\](.*?)\\[/not-signature\\]'si", "" );    
} else {
    $tpl->set_block( "'\\[signature\\](.*?)\\[/signature\\]'si", "" );
    $tpl->set( '{signature}', "" );
    $tpl->set( '[not-signature]', "" );
    $tpl->set( '[/not-signature]', "" );
}

[signature]{signature}[/signature]
[not-signature]Подписи нет[/not-signature]

{include file="engine/modules/userbox.php?&userName={login}"}