wp: Limit Post Title by amount of characters

functions.php

<?php
function short_title($num) { 
$limit = $num+1;
$title = str_split(get_the_title());
$length = count($title);
if ($length>=$num) {
$title = array_slice( $title, 0, $num);
$title = implode("",$title)."...";
echo $title;
} else {
the_title();
}
}
?>

// Usage <?php short_title(10); ?>