vladcosorg

    public function __toString() {
       try {
           return $this->call();
       } catch(\Exception $e) {
               // the __toString method isn't allowed to throw exceptions
               // so we turn them into an error instead
               trigger_error($e->getMessage() . "\n" . $e->getTraceAsString(), E_USER_ERROR);
               return '';
           }
    }

vladcosorg

<?php

namespace Your\Bundle\Misc;

class SluggableListener extends \Gedmo\Sluggable\SluggableListener
{

    public function __construct(){
        $this->setTransliterator(array('\Your\Bundle\Misc\Transliterator', 'transliterate'));
    }