Truncate title in comments

I have this code to call up the latest comments.

I’d like to truncate the title in these comments.
How can I get this to work?


<?php
global $comment;

if ( $comments = $wpdb->get_results("SELECT comment_author, comment_ID, comment_post_ID FROM $wpdb->comments WHERE comment_approved='1' ORDER BY comment_date_gmt
DESC LIMIT 15") ) :
?>

<?php _e(''); ?>
<?php
foreach ($comments as $comment) {
echo '<img class="imgpoll" src="https://frontpage.klifix.nl/forumfiles/pijl_trans.gif"/>' . sprintf('%s :: %s', get_comment_author_link(), 'comment_post_ID) . '#comment-' . $comment->comment_ID . '">' . get_the_title($comment->comment_post_ID) . '
');
echo '';
}

?>

<?php endif; ?>