Twig filter return inside html tag

Thanks to @Ilya Yarkovets I've found way to solve that problem. All I needed to do is to change $title by making this:

$title = html_entity_decode(str_replace(' ', ' ', $title));return ' data-toggle=tooltip data-placement=top title='.($title).' ';

&thinsp was better than &nbsp because of text-wrapping.

Thanks to the dynamic Twig filters you can simplify the code of your extension as follows:

class TooltipExtension extends \Twig_Extension{    public function getFilters()    {        return array(            new \Twig_SimpleFilter('tooltip', array($this, 'tooltip',['is_safe'=>['html']])),            new \Twig_SimpleFilter('tooltip_*', array($this, 'positionedTooltip', ['is_safe'=>['html']])),        );    }    public function tooltip($title)    {            return $this->positionedTooltip('top', $title);    }    public function positionedTooltip($position, $title)    {        $validPositions = ['top', 'bottom', 'left', 'right'];        if (!in_array($position, $validPositions)) {            throw new \InvalidArgumentException(sprintf('The position of the tooltip can only be one of the following: %s', implode(', ', $validPositions)));        }        return sprintf(' data-toggle=tooltip data-placement=%s title="%s" ', $position, $title);    }    public function getName()    {        return 'tooltip_extension';    }}