a truncate filter for Twig. Just add this after registering the Twig Service Provider.

bootstrap.php

<?php

$app['twig']->addFilter(new Twig_SimpleFilter('truncate', function($string, $size) {
    if(strlen($string) < $size)
        return $string;
    else
        return array_shift(str_split($string, $size)) . "...";
}));