<?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 $considerHtml If true, HTML tags would be handled correctly
 *
 * @return string Trimmed string.
 */
function truncateHtml($text, $length = 100, $ending = '...', $exact = false, $considerHtml = true) {
	if ($considerHtml) {
        // if the plain text is shorter than the maximum length, return the whole text
		if (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();
		$truncate = '';
		foreach ($lines as $line_matchings) {
            // if there is any html-tag in this line, handle it and add it (uncounted) to the output
			if (!empty($line_matchings[1])) {
                // if it's an "empty element" with or without xhtml-conform closing slash
				if (preg_match('/^<(\s*.+?\/\s*|\s*(img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param)(\s.+?)?)>$/is', $line_matchings[1])) {
                    // do nothing
                // if tag is a closing tag
				} else if (preg_match('/^<\s*\/([^\s]+?)\s*>$/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
				} else if (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 entities
				if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', $line_matchings[2], $entities, PREG_OFFSET_CAPTURE)) {
                    // calculate the real length of all entities in the legal range
					foreach ($entities[0] as $entity) {
						if ($entity[1]+1-$entities_length <= $left) {
							$left--;
							$entities_length += strlen($entity[0]);
						} else {
                            // no more characters left
							break;
						}
					}
				}
				$truncate .= substr($line_matchings[2], 0, $left+$entities_length);
                // maximum lenght is reached, so get off the loop
				break;
			} else {
				$truncate .= $line_matchings[2];
				$total_length += $content_length;
			}
            // if the maximum length is reached, get off the loop
			if($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-tags
		foreach ($open_tags as $tag) {
			$truncate .= '</' . $tag . '>';
		}
	}
	return $truncate;
}
