PHP: exact line breaks of words and tags into an array

Question

The challenge is to split the string into 500 characters into an array. I did this with str_split, but I have a problem. Of course, this should be caused by words, otherwise this text is not readable. And more than that. This text contains links, and links will be broken if I decompose them (infact any html) =) Therefore, I need to start splitting only if the tag has ended or has not even started ... the same goes for words. ± 100 characters is not a problem.

I would be very grateful for the code to do this. I am not very familiar with regular expressions.

EDIT: Example

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ac diam non nisl interdum tempus. Nam id ipsum id nunc tempus varius. Suspendisse ut neque a velit elementum placerat. Curabitur lobortis, lorem sit <a href="#">amet tincidunt ultricies,</a> eros ante feugiat dui, sit amet lacinia metus risus a magna. Duis velit dui, sollicitudin at aliquet et, elementum at dui. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae;

Script:

<?php

$str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. <a href=\"http://example.com\">Phasellus condimentum
facilisis ipsum</a>, quis elementum urna ornare non. Cras nisi libero, dapibus sed euismod id, pharetra eu libero.
Maecenas mi nulla, ultrices in congue in, viverra ac massa. Quisque <br/>at turpis nulla. Suspendisse semper urna eu
augue aliquet dictum. Mauris at purus in lectus varius bibendum. <em>Fusce hendrerit <strong>posuere ante</strong></em>,
at pellentesque odio lobortis at. Integer quis urna eget ipsum dictum volutpat quis et leo. Etiam hendrerit eleifend
ornare. Phasellus eget justo elit.";

$str = str_split($str, 200);

var_dump($str);

Conclusion:

    array(4) {
  [0]=>
  string(200) "Lorem ipsum dolor sit amet, consectetur adipiscing elit. <a href="http://example.com">Phasellus condimentum 
facilisis ipsum</a>, quis elementum urna ornare non. Cras nisi libero, dapibus sed euismod "
  [1]=>
  string(200) "id, pharetra eu libero. 
Maecenas mi nulla, ultrices in congue in, viverra ac massa. Quisque <br/>at turpis nulla. Suspendisse semper urna eu 
augue aliquet dictum. Mauris at purus in lectus varius bi"
  [2]=>
  string(200) "bendum. <em>Fusce hendrerit <strong>posuere ante</strong></em>, 
at pellentesque odio lobortis at. Integer quis urna eget ipsum dictum volutpat quis et leo. Etiam hendrerit eleifend 
ornare. Phasellus"
  [3]=>
  string(17) " eget justo elit."
}

This is harsh, half the word comes to $ str [1]. And if it was a link, then it would be spoiled.

Answer 1

http://www.gsdesign.ro/blog/cut-html-string-without-breaking-the-tags/

Answer 2

, , PHP, XML- . - , :

<?php

$str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. <a href=\"http://example.com\">Phasellus condimentum facilisis ipsum</a>, quis elementum urna ornare non. Cras nisi libero, dapibus sed euismod id, pharetra eu libero. Maecenas mi nulla, ultrices in congue in, viverra ac massa. Quisque <br/>at turpis nulla. Suspendisse semper urna eu augue aliquet dictum. Mauris at purus in lectus varius bibendum. <em>Fusce hendrerit <strong>posuere ante</strong></em>, at pellentesque odio lobortis at. Integer quis urna eget ipsum dictum volutpat quis et leo. Etiam hendrerit eleifend ornare. Phasellus eget justo elit.";

$dom = new DOMDocument;

$root = $dom->createDocumentFragment();
$root->appendXML($str);

$bits = array();

foreach ($root->childNodes as $node) {
    if ($node->nodeType == XML_TEXT_NODE) {
        $bits = array_merge($bits, explode(' ', $node->nodeValue));
    } elseif ($node->nodeType == XML_ELEMENT_NODE) {
        $dom->appendChild($newnode = $node->cloneNode(true));
        $bits[] = $dom->saveHTML();
        $dom->removeChild($newnode);
    }
}

var_dump($bits);