PHP Html Truncate

gistfile1.txt

function html_truncate($text, $length, $suffix = '…', $isHTML = true)
    {
        $i = 0;
        $simpleTags = ['br' => true, 'hr' => true, 'input' => true, 'image' => true, 'link' => true, 'meta' => true];
        $tags = [];
        if ($isHTML) {
            preg_match_all('/<[^>]+>([^<]*)/', $text, $m, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
            foreach ($m as $o) {
                if ($o[0][1] - $i >= $length) {
                    break;
                }
                $t = substr(strtok($o[0][0], " \t\n\r\0\x0B>"), 1);

                // test if the tag is unpaired, then we mustn't save them
                if ($t[0] != '/' && !isset($simpleTags[$t])) {
                    $tags[] = $t;
                } elseif (end($tags) == substr($t, 1)) {
                    array_pop($tags);
                }
                $i += $o[1][1] - $o[0][1];
            }
        }

        // output without closing tags
        $output = substr($text, 0, $length = min(strlen($text),  $length + $i));

        // closing tags
        $output2 = count($tags = array_reverse($tags)) ? '</' . implode('></', $tags) . '>' : '';

        // Find last space or HTML tag (solving problem with last space in HTML tag eg. <span class="new">)
        $preg = preg_split('/<.*>| /', $output, -1, PREG_SPLIT_OFFSET_CAPTURE);
        $last = end($preg);
        $pos = (int) end($last);

        // Append closing tags to output
        $output .= $output2;

        // Get everything until last space
        $one = substr($output, 0, $pos);

        // Get the rest
        $two = substr($output, $pos, (strlen($output) - $pos));

        // Extract all tags from the last bit
        preg_match_all('/<(.*?)>/s', $two, $tags);

        // Add suffix if needed
        if (strlen($text) > $length) {
            $one .= $suffix;
        }

        // Re-attach tags
        $output = $one . implode($tags[0]);

        // added to remove unnecessary closure
        $output = str_replace('</!-->', '', $output);

        return $output;
    }