Close open HTML tags in a string

Question

Situation is a string that results in something like this:

This is some text and here is a bold text then the post stop here....
         


        

Answer 1

A small modification to the original answer...while the original answer stripped tags correctly. I found that during my truncation, I could end up with chopped up tags. For example:

This text has some in it

Truncating at character 21 results in:

This text has some <

The following code, builds on the next best answer and fixes this.

function truncateHTML($html, $length)
{
    $truncatedText = substr($html, $length);
    $pos = strpos($truncatedText, ">");
    if($pos !== false)
    {
        $html = substr($html, 0,$length + $pos + 1);
    }
    else
    {
        $html = substr($html, 0,$length);
    }

    preg_match_all('#<(?!meta|img|br|hr|input\b)\b([a-z]+)(?: .*)?(?#iU', $html, $result);
    $openedtags = $result[1];

    preg_match_all('##iU', $html, $result);
    $closedtags = $result[1];

    $len_opened = count($openedtags);

    if (count($closedtags) == $len_opened)
    {
        return $html;
    }

    $openedtags = array_reverse($openedtags);
    for ($i=0; $i < $len_opened; $i++)
    {
        if (!in_array($openedtags[$i], $closedtags))
        {
            $html .= '';
        }
        else
        {
            unset($closedtags[array_search($openedtags[$i], $closedtags)]);
        }
    }


    return $html;
}


$str = "This text has bold in it";
print "Test 1 - Truncate with no tag: " . truncateHTML($str, 5) . "
\n";
print "Test 2 - Truncate at start of tag: " . truncateHTML($str, 20) . "
\n";
print "Test 3 - Truncate in the middle of a tag: " . truncateHTML($str, 16) . "
\n";
print "Test 4: - Truncate with less text: " . truncateHTML($str, 300) . "
\n";

Hope it helps someone out there.