HTML PHP Truncator using tidy. IT counts the texts chars to N chars, if the word didn't end yet it ends, and it closes the html tags that it's left open

Example.php

echo '<pre>';
$subject='<p>Lorem</p>
<pre class="brush:js;auto-links:false;toolbar:false" contenteditable="false"> //$(\'textarea[name=html]\').editor();
  tinymce.init({selector:\'textarea[name=html]\',
  plugins: [ // plugins list
        "preview sh4tinymce wordcount"
    ],
    toolbar: "undo redo | sh4tinymce | preview" // toolbar list
});</pre>
<p> Ipsum dolor sit amet</p>';
$hTruncator=new HtmlTruncator($subject,'<a href="#"> More ... </a>');
echo htmlspecialchars($hTruncator->truncateHtml(10));

HtmlTruncator.php

<?php
/**
 * Truncate an html to at Least N characters, close the remaining tags, and end the world in which it stopped.
 * Optionally preserve syntaxHighlighter code
 * @author Fabio Oliveira Costa <fabio@dexus.com.br>
 */
class HtmlTruncator{
    protected $_tidy;
    protected $_alwaysShowSyntaxHighlighter;
    protected $_moreSufix;
    /**
     * 
     * @param string $raw       the raw HTML we want to truncate
     * @param int $maxLength the max length of simple text we want
     * @param string $moreSufix the sufix for more if any
     */
    public function __construct($raw,$moreSufix='',$alwaysShowSyntaxHighlighter=true){
        $this->_tidy=tidy_parse_string($raw)->body();
        $this->_moreSufix=$moreSufix;
        $this->_alwaysShowSyntaxHighlighter=$alwaysShowSyntaxHighlighter;
    }
    /**
     * Make a left tag
     * @param  tidyNode $tidy [description]
     * @return string
     */
    protected static function _makeLeftTag(tidyNode $tidy){
        if($tidy->isText()){
            return '';
        }
        $atrs='';
        if(!empty($tidy->attribute)){
            foreach ($tidy->attribute as $k => $v) {
                $atrs.=' '.$k.'="'.$v.'"';
            }
        }
        return '<'.$tidy->name.$atrs.'>';
    }
    protected static function _makeRightTag(tidyNode $tidy){
         if($tidy->isText()){
            return '';
        }
        return '</'.$tidy->name.'>';
    }
    /**
     * Truncate the html that this HtmlTruncator represent to more or less length characters
     * @param  int  $length 
     * @return  string the truncated html
     */
    public function truncateHtml($length){
        $finished=false;
        $counting=0;
        $excerpt='';

        $ret= $this->_truncateHtml($this->_tidy,$length,$finished,$counting,$excerpt);
        if($finished){
            return $ret.$this->_moreSufix;
        }
        else{
            return $ret;
        }
    }
    /**
     * Check whether this node is the syntax highlighter node
     * @param  tidyNode $tidy [description]
     * @return boolean        [description]
     */
    protected static function _isSyntaxHighlighter(tidyNode $tidy){
      if($tidy->name==='pre'){
        if(array_key_exists('class', $tidy->attribute) && strrpos($tidy->attribute['class'], 'brush')!==false){
            return true;
        }
      }
      return false;
    }
    protected  function _truncateHtml(tidyNode $tidy,$length,&$finished,&$counting) {
        if(empty($tidy)){
            return '';
        }
        $excerpt='';
       
       if($this->_alwaysShowSyntaxHighlighter && static::_isSyntaxHighlighter($tidy)){
         return   static::_makeLeftTag($tidy).$tidy->value.static::_makeRightTag($tidy);
       }
       else if($tidy->hasChildren()){
           foreach($tidy->child as $c){
              $excerpt.=$this->_truncateHtml($c,$length,$finished,$counting);
                if($finished){
                    break;
                }
            }

            if($tidy->name==='body'){
                return $excerpt;
            }
            return  static::_makeLeftTag($tidy).$excerpt.static::_makeRightTag($tidy);
        }
        else{
              if($tidy->isText()){
                    $text=$tidy->value;

                    $size=strlen($text);

                    if($counting+$size>=$length){
                        //First space after the minimum chars
                        $lastSpace=strpos($text,' ',$length-$counting);
                        if($lastSpace!==false){
                            $text=substr($text, 0,$lastSpace);
                        }
                        $size=$lastSpace;
                        $finished=true;                        
                    }
                    $counting+=$size;
                    return $text;
                  
                }
             
              return static::_makeLeftTag($tidy).static::_makeRightTag($tidy);
        }
        
    }
        
}