$twig->addFilter('moretag', new Twig_Filter_Function('my_moretag'));
function my_moretag($text) {
/*
filter out text before <!--more--> tag, if no tag exist limit letters.
*/
if (strpos($text,'<!--more-->') !== false) {
$text = current(explode("<!--more-->", $text));
}else{
// $pos = strpos($text, ' ', 60);
$text = substr($text,0,60 );
$text = $text.' ...';
}
return $text;
}