Putting ... at the end of a title (substr question)

[qwikad.com]

I've shortened titles to 60 characters. How do I tell this code to show three dots ... at the end of a title if the that title is more than 60 characters long and show nothing if it is less?

<?php echo substr($row['adtitle'], 0, 60); ?>

Thank you.

[Beverleyh]

Something like;

$title = $row['adtitle'];
if (strlen($title) > 60) {
	$title = substr($title, 0, 60).'...';
}
echo $title;

[qwikad.com]

Thank you. It's what I needed!