Online PHP editor | output for Ohb5l

@ 2013-03-26T04:24:38Z

<?php
echo '<pre>';
$html = "
</p>consectetur <b>adipisc<i>in</i>g </b>elit. Maecenas sit amet molestie enim. Nulla gravida mi sed ipsum </p> 
<p>pellentesque<br>ut pulvinar orci consequat. Donec tempus rutrum urna at iaculis. Ut sagittis, tellus eu venenatis imperdiet,</p> 

<ol> 
<li>
  <ol>
    <li><b></b></li>
    <li>sdaf</li> 
  </ol> 
sem dolor mattis leo, 

</li>  
<li>in consequat elit lorem ut ligula.</li> 
</ol> 
Praessadf";

echo htmlspecialchars($html)."<br>";

var_dump(check_html($html));

function check_html($html) {
  $tags = array();
  preg_match_all('#<(/?[a-zA-Z]+)\b.*?>#im', $html, $tags);
  $tags = array_map('strtolower', $tags[1]);

  $lists = array('ul', 'ol');
  $single_tags = array('br');

  $tags_stack = new SplStack();
  $lists_stack = new SplStack();

  foreach ($tags as $tag) {

    if ($tag[0] != '/') { // start tag 
      
      if (in_array($tag, $single_tags)) { // if single tag, just continue
        continue;
      } elseif (in_array($tag, $lists)) {
        $lists_stack->push($tag); // new list starts 
      }
      $tags_stack->push($tag);
      
    } else { // end tag 
      
      if (!$tags_stack->count()) { 
        return false; // there aren't opened tags
      }
      
      $end_tag = trim($tag, '/');

      // handle lists 
      if (in_array($end_tag, $lists)) {
        if (!$lists_stack->count() || $lists_stack->pop() != $end_tag) {
          return false; // there are no opened lists or unclosed list tag 
        }
      } elseif ($end_tag == 'li') {
        if (!$lists_stack->count()) {
          return false; // there are no opened lists 
        }
      }

      if ($tags_stack->pop() != $end_tag) {
        return false; // unclosed tag 
      }
    }
  }

  return !$tags_stack->count(); // true if stack is empty
}

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: <pre> consectetur adipiscing elit. Maecenas sit amet molestie enim. Nulla gravida mi sed ipsum pellentesque ut pulvinar orci consequat. Donec tempus rutrum urna at iaculis. Ut sagittis, tellus eu venenatis imperdiet, <ol> <li> <ol> <li></li> <li>sdaf</li> </ol> sem dolor mattis leo, </li> <li>in consequat elit lorem ut ligula.</li> </ol> Praessadf bool(false)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: <pre> consectetur adipiscing elit. Maecenas sit amet molestie enim. Nulla gravida mi sed ipsum pellentesque ut pulvinar orci consequat. Donec tempus rutrum urna at iaculis. Ut sagittis, tellus eu venenatis imperdiet, <ol> <li> <ol> <li></li> <li>sdaf</li> </ol> sem dolor mattis leo, </li> <li>in consequat elit lorem ut ligula.</li> </ol> Praessadf Fatal error: Class 'SplStack' not found in /in/Ohb5l on line 32
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9: <pre> consectetur adipiscing elit. Maecenas sit amet molestie enim. Nulla gravida mi sed ipsum pellentesque ut pulvinar orci consequat. Donec tempus rutrum urna at iaculis. Ut sagittis, tellus eu venenatis imperdiet, <ol> <li> <ol> <li></li> <li>sdaf</li> </ol> sem dolor mattis leo, </li> <li>in consequat elit lorem ut ligula.</li> </ol> Praessadf Fatal error: Cannot instantiate non-existent class: splstack in /in/Ohb5l on line 32
Process exited with code 255.
Output for 4.3.0 - 4.3.1: <pre> consectetur adipiscing elit. Maecenas sit amet molestie enim. Nulla gravida mi sed ipsum pellentesque ut pulvinar orci consequat. Donec tempus rutrum urna at iaculis. Ut sagittis, tellus eu venenatis imperdiet, <ol> <li> <ol> <li></li> <li>sdaf</li> </ol> sem dolor mattis leo, </li> <li>in consequat elit lorem ut ligula.</li> </ol> Praessadf Fatal error: Cannot instantiate non-existent class: splstack in /in/Ohb5l on line 32

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