Networking\InitCmsBundle\Twig\Extension\NetworkingHelperExtension::truncate PHP Метод

    public static function truncate(\Twig_Environment $env, $text, $length = 100, $ellipsis = '...', $exact = true, $html = false)
    {
        if ($html && $ellipsis == '...' && $env->getCharset() == 'UTF-8') {
            $ellipsis = "…";
        }
        if (!function_exists('mb_strlen')) {
            class_exists('Multibyte');
        }
        $openTags = array();
        if ($html) {
            $text = html_entity_decode($text, null, $env->getCharset());
            if (mb_strlen(preg_replace('/<.*?>/', '', $text)) <= $length) {
                return $text;
            }
            $totalLength = mb_strlen(strip_tags($ellipsis));
            $truncate = '';
            preg_match_all('/(<\\/?([\\w+]+)[^>]*>)?([^<>]*)/', $text, $tags, PREG_SET_ORDER);
            foreach ($tags as $tag) {
                if (!preg_match('/img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param/s', $tag[2])) {
                    if (preg_match('/<[\\w]+[^>]*>/s', $tag[0])) {
                        array_unshift($openTags, $tag[2]);
                    } elseif (preg_match('/<\\/([\\w]+)[^>]*>/s', $tag[0], $closeTag)) {
                        $pos = array_search($closeTag[1], $openTags);
                        if ($pos !== false) {
                            array_splice($openTags, $pos, 1);
                        }
                    }
                }
                $truncate .= $tag[1];
                $contentLength = mb_strlen(preg_replace('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', ' ', $tag[3]));
                if ($contentLength + $totalLength > $length) {
                    $left = $length - $totalLength;
                    $entitiesLength = 0;
                    if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', $tag[3], $entities, PREG_OFFSET_CAPTURE)) {
                        foreach ($entities[0] as $entity) {
                            if ($entity[1] + 1 - $entitiesLength <= $left) {
                                $left--;
                                $entitiesLength += mb_strlen($entity[0]);
                            } else {
                                break;
                            }
                        }
                    }
                    $truncate .= mb_substr($tag[3], 0, $left + $entitiesLength);
                    break;
                } else {
                    $truncate .= $tag[3];
                    $totalLength += $contentLength;
                }
                if ($totalLength >= $length) {
                    break;
                }
            }
        } else {
            if (mb_strlen($text) <= $length) {
                return $text;
            }
            $truncate = mb_substr($text, 0, $length - mb_strlen($ellipsis));
        }
        if (!$exact) {
            $spacepos = mb_strrpos($truncate, ' ');
            if ($html) {
                $truncateCheck = mb_substr($truncate, 0, $spacepos);
                $lastOpenTag = mb_strrpos($truncateCheck, '<');
                $lastCloseTag = mb_strrpos($truncateCheck, '>');
                if ($lastOpenTag > $lastCloseTag) {
                    preg_match_all('/<[\\w]+[^>]*>/s', $truncate, $lastTagMatches);
                    $lastTag = array_pop($lastTagMatches[0]);
                    $spacepos = mb_strrpos($truncate, $lastTag) + mb_strlen($lastTag);
                }
                $bits = mb_substr($truncate, $spacepos);
                preg_match_all('/<\\/([a-z]+)>/', $bits, $droppedTags, PREG_SET_ORDER);
                if (!empty($droppedTags)) {
                    if (!empty($openTags)) {
                        foreach ($droppedTags as $closingTag) {
                            if (!in_array($closingTag[1], $openTags)) {
                                array_unshift($openTags, $closingTag[1]);
                            }
                        }
                    } else {
                        foreach ($droppedTags as $closingTag) {
                            $openTags[] = $closingTag[1];
                        }
                    }
                }
            }
            $truncate = mb_substr($truncate, 0, $spacepos);
        }
        $truncate .= $ellipsis;
        if ($html) {
            foreach ($openTags as $tag) {
                $truncate .= '</' . $tag . '>';
            }
        }
        return $truncate;
    }