How to close unclosed HTML Tags?

Question

Whenever we are fetching some user inputed content with some editing from the database or similar sources, we might retrieve the portion which only contains the opening tag

Answer 1

I used to the native DOMDocument method, but with a few improvements for safety.

Note, other answers that use DOMDocument do not consider html strands such as

This is a HTML strand

The above will actually result in

This is a HTML strand

My Solution is below

function closeDanglingTags($html) {
    if (strpos($html, '<') || strpos($html, '>')) {
        // There are definitiley HTML tags
        $wrapped = false;
        if (strpos(trim($html), '<') !== 0) {
            // The HTML starts with a text node. Wrap it in an element with an id to prevent the software wrapping it with a 

            //  that we know nothing about and cannot safely retrieve
            $html = cHE::getDivHtml($html, null, 'closedanglingtagswrapper');
            $wrapped = true;
        }
        $doc = new DOMDocument();
        $doc->encoding = 'utf-8';
        @$doc->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
        if ($doc->firstChild) {
            // Test whether the firstchild is definitely a DOMDocumentType
            if ($doc->firstChild instanceof DOMDocumentType) {
                // Remove the added doctype
                $doc->removeChild($doc->firstChild);
            }
        }
        if ($wrapped) {
            // The contents originally started with a text node and was wrapped in a div#plasmappclibtextwrap. Take the contents
            //  out of that div
            $node = $doc->getElementById('closedanglingtagswrapper');
            $children = $node->childNodes;  // The contents of the div. Equivalent to $('selector').children()
            $doc = new DOMDocument();   // Create a new document to add the contents to, equiv. to "var doc = $('');"
            foreach ($children as $childnode) {
                $doc->appendChild($doc->importNode($childnode, true)); // E.g. doc.append()
            }
        }
        // Remove the added html,body tags
        return trim(str_replace(array('', ''), '', html_entity_decode($doc->saveHTML())));
    } else {
        return $html;
    }
}