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

Here is a function i've used before, which works pretty well:

function closetags($html) {
    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;
} 

Personally though, I would not do it using regexp but a library such as Tidy. This would be something like the following:

$str = '
This is some text and here is a bold text then the post stop here....
';
$tidy = new Tidy();
$clean = $tidy->repairString($str, array(
    'output-xml' => true,
    'input-xml' => true
));
echo $clean;