Shortening Text Tweet-like Without Cutting Links Inside

I've got a string like this: I love @kevinrose 's new website Link And I have this function: function short($string, $max = 255) {

Solution 1:

see this from PHP: Truncate string while preserving HTML tags and whole words - Alan Whipple -> http://alanwhipple.com/2011/05/25/php-truncate-string-preserving-html-tags-words/

<?php/**
 * truncateHtml can truncate a string up to a number of characters while preserving whole words and HTML tags
 *
 * @param string $text String to truncate.
 * @param integer $length Length of returned string, including ellipsis.
 * @param string $ending Ending to be appended to the trimmed string.
 * @param boolean $exact If false, $text will not be cut mid-word
 * @param boolean $considerHtml If true, HTML tags would be handled correctly
 *
 * @return string Trimmed string.
 */functiontruncateHtml($text, $length = 100, $ending = '...', $exact = false, $considerHtml = true) {
    if ($considerHtml) {
        // if the plain text is shorter than the maximum length, return the whole textif (strlen(preg_replace('/<.*?>/', '', $text)) <= $length) {
            return$text;
        }
        // splits all html-tags to scanable lines
        preg_match_all('/(<.+?>)?([^<>]*)/s', $text, $lines, PREG_SET_ORDER);
        $total_length = strlen($ending);
        $open_tags = array();
        $truncate = '';
        foreach ($linesas$line_matchings) {
            // if there is any html-tag in this line, handle it and add it (uncounted) to the outputif (!empty($line_matchings[1])) {
                // if it's an "empty element" with or without xhtml-conform closing slashif (preg_match('/^<(\s*.+?\/\s*|\s*(img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param)(\s.+?)?)>$/is', $line_matchings[1])) {
                    // do nothing// if tag is a closing tag
                } elseif (preg_match('/^<\s*\/([^\s]+?)\s*>$/s', $line_matchings[1], $tag_matchings)) {
                    // delete tag from $open_tags list$pos = array_search($tag_matchings[1], $open_tags);
                    if ($pos !== false) {
                    unset($open_tags[$pos]);
                    }
                // if tag is an opening tag
                } elseif (preg_match('/^<\s*([^\s>!]+).*?>$/s', $line_matchings[1], $tag_matchings)) {
                    // add tag to the beginning of $open_tags list
                    array_unshift($open_tags, strtolower($tag_matchings[1]));
                }
                // add html-tag to $truncate'd text$truncate .= $line_matchings[1];
            }
            // calculate the length of the plain text part of the line; handle entities as one character$content_length = strlen(preg_replace('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', ' ', $line_matchings[2]));
            if ($total_length+$content_length> $length) {
                // the number of characters which are left$left = $length - $total_length;
                $entities_length = 0;
                // search for html entitiesif (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', $line_matchings[2], $entities, PREG_OFFSET_CAPTURE)) {
                    // calculate the real length of all entities in the legal rangeforeach ($entities[0] as$entity) {
                        if ($entity[1]+1-$entities_length <= $left) {
                            $left--;
                            $entities_length += strlen($entity[0]);
                        } else {
                            // no more characters leftbreak;
                        }
                    }
                }
                $truncate .= substr($line_matchings[2], 0, $left+$entities_length);
                // maximum lenght is reached, so get off the loopbreak;
            } else {
                $truncate .= $line_matchings[2];
                $total_length += $content_length;
            }
            // if the maximum length is reached, get off the loopif($total_length>= $length) {
                break;
            }
        }
    } else {
        if (strlen($text) <= $length) {
            return$text;
        } else {
            $truncate = substr($text, 0, $length - strlen($ending));
        }
    }
    // if the words shouldn't be cut in the middle...if (!$exact) {
        // ...search the last occurance of a space...$spacepos = strrpos($truncate, ' ');
        if (isset($spacepos)) {
            // ...and cut the text in this position$truncate = substr($truncate, 0, $spacepos);
        }
    }
    // add the defined ending to the text$truncate .= $ending;
    if($considerHtml) {
        // close all unclosed html-tagsforeach ($open_tagsas$tag) {
            $truncate .= '</' . $tag . '>';
        }
    }
    return$truncate;
}

?>

also see here

• Truncating Text & HTML with PHP | Patrick Galbraith -> http://www.pjgalbraith.com/2011/11/truncating-text-html-with-php/

Solution 2:

Here's a bit shorter method. It doesn't walk the DOM tree, but it will work for nearly all situations.

This method first strips all html tags from the content (so html tags won't be counted towards the string length either). Then, if the string needs to be truncated, it truncates it and re-inserts all html tags.

<?phpfunctionshort($string, $max = 255) {
    preg_match_all('/<[^>]+>/', $string, $tags); // Save tag information for later$stripped = preg_replace('/<[^>]+>/', '', $string); // Strip html tags// Truncate the string if neededif (strlen($stripped) > $max) {
        $truncated = mb_substr($stripped, 0, $max, 'utf-8');

        // Insert html tags, if anyif (sizeof($tags) > 0) {
            $pos = 0;
            foreach ($tags[0] as$tag) {
                $pos += strpos($string, $tag); // Get the position the tag should be inserted at$string = substr($string, $pos); // Shift to avoid issues with duplicate tags$truncated = substr_replace($truncated, $tag, $pos, 0); // Insert the tag
            }
        }

        $string = $truncated . '&hellip;';
    }

    return$string;
}

echo short('I love @kevinrose\'s new website <a href="http://kevinrose.com">Link</a>. Here is a bit of additional text after the link.<a></a>', 50);