In sometime in your string close tag missing in this case it need to close tag. This function help you

<?php

function closetags($html) {
    preg_match_all('#<(?!meta|img|br|hr|input\b)\b([a-z]+)(?: .*)?(?<![/|/ ])>#iU', $html, $result);
    $openedtags = $result[1];
    preg_match_all('#</([a-z]+)>#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)) {
            $html .= '</'.$openedtags[$i].'>';
        } else {
            unset($closedtags[array_search($openedtags[$i], $closedtags)]);
        }
    }
    return $html;
}

$str = '<div>This is some text<p> and here is a <strong>bold text then the post stop here....';
echo closetags($str);

This is result :

Normal text with missing close tag :
<div>This is some text<p> and here is a <strong>bold text then the post stop here....

Then result is :
<div>This is some text<p> and here is a <strong>bold text then the post stop here....</strong></p></div>

so this function automatic close tag.

Resource from :
https://stackoverflow.com/questions/3810230/close-open-html-tags-in-a-string

if you face any problem then please inform me.