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@ 2013-05-16T08:43:59Z

<?php



class Html{

  protected
    $reachedLimit = false,
    $totalLen     = 0,
    $maxLen       = 25;

  public static function trim($html, $maxLen = 25){

    $dom = new DomDocument();
    $dom->loadHTML($html);

    
    $html = new static();
    $html->walk($dom, $maxLen);

    // remove wrapper tags added by DD (doctype, html...)
    // http://stackoverflow.com/a/6953808/1058140
    $dom->removeChild($dom->firstChild);            
    $dom->replaceChild($dom->firstChild->firstChild->firstChild, $dom->firstChild);
  
    return $dom->saveHTML();
  }

  protected function walk(DomNode $node, $maxLen){

    // remove any nodes that passed our limit
    if($this->reachedLimit){
      $node->parentNode->removeChild($node);
      return;
    }  

    // only text nodes should have text,
    // so do the splitting here
    if($node instanceof DomText){      
      $this->totalLen += $nodeLen = strlen($node->nodeValue);

      if($this->totalLen > $maxLen){
        $node->nodeValue = substr($node->nodeValue, 0, $nodeLen - ($this->totalLen - $maxLen));
        $this->reachedLimit = true;
      }

    }

    if(!$node->hasChildNodes())
      return;

    // if node has children, walk its child elements 
    foreach($node->childNodes as $child)
      $this->walk($child, $maxLen);    
  }


}




print html::trim('<p>I can haz <strong> html trim </strong>', 14);

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 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 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: <p>I can haz <strong> htm</strong></p>
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or '$' in /in/4Mma6 on line 18
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or '$' in /in/4Mma6 on line 18
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/4Mma6 on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/4Mma6 on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/4Mma6 on line 7
Process exited with code 255.

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