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function HtmlFix($html)
{

  if(!function_exists('tidy_repair_string'))
    return $html;
  //use tidy to repair html code

  //repair
  $str = tidy_repair_string($html,
                   array('output-xhtml'=>true),
                   'utf8');
  //parse
  $str = tidy_parse_string($str,
                  array('output-xhtml'=>true),
                  'utf8');
  $s = '';

  $nodes = @tidy_get_body($str)->child;

  if(!is_array($nodes)){
    $returnVal = 0;
    return $s;
  }

  foreach($nodes as $n){
    $s .= $n->value;
  }
  return $s;
}

function HtmlFixSafe($html)
{

  if(!function_exists('tidy_repair_string'))
    return $html;
  //use tidy to repair html code

  // tidy 的参数设定
  $conf = array(
                'output-xhtml'=>true
                ,'drop-empty-paras'=>FALSE
                ,'join-classes'=>TRUE
                ,'show-body-only'=>TRUE
                );

 //repair
  $str = tidy_repair_string($html,$conf,'utf8');
  //生成解析树
  $str = tidy_parse_string($str,$conf,'utf8');

  $s ='';

  //得到body节点
  $body = @tidy_get_body($str);

  //函数 _dumpnode，检查每个节点，过滤后输出
  function _dumpnode($node,&$s){

   //查看节点名，如果是<script> 和<style>就直接清除
    switch($node->name){
    case 'script':
    case 'style':
      return;
      break;
    default:
    }

    if($node->type == TIDY_NODETYPE_TEXT){
      /*
       如果该节点内是文字，做额外的处理：
       过长文字的自动换行问题;
       超链接的自动识别(未实现)
      */
      // insert <wbr>
      $s .= HtmlInsertWbrs($node->value,30,'','&?/\');

      // auto links ??? *** TODO ***
      return;
    }

   //不是文字节点，那么处理标签和它的属性
    $s .= '<'.$node->name;

    //检查每个属性
    if($node->attribute){
      foreach($node->attribute as $name=>$value){

        /*
         清理一些DOM事件，通常是on开头的，
         比如onclick onmouseover等....
         或者属性值有javascript:字样的，
         比如href="javascript:"的也被清除.
         */
        if(strpos($name,'on') === 0
        ||
        stripos(trim($value),'javascript:') ===0
        ){
          continue;
        }

       //保留安全的属性
        $s .= ' '.$name.'="'.HtmlEscape($value).'"';

      }
    }

   //递归检查该节点下的子节点
    if($node->child){

      $s .= '>';

      foreach($node->child as $child){
        _dumpnode($child,$s);
      }

      //子节点处理完毕，闭合标签
      $s .= '</'.$node->name.'>';
    }else{

      /*
       已经没有子节点了，将标签闭合
      (事实上也可以考虑直接删除掉空的节点)
      */
      if($node->type == TIDY_NODETYPE_START)
        $s .= '></'.$node->name.'>';
      else
        /*
          对非配对标签，比如<hr/> <br/> <img/>等
          直接以 />闭合之
          */
        $s .= '/>';
    }
  }
   //函数定义end

  //通过上面的函数 对 body节点开始过滤。
  if($body->child){

    foreach($body->child as $child)
      _dumpnode($child,$s);
  }else
    return '';

  return $s;
}

之前介绍的是HtmlEscapeInsertWbrs()，而上面使用的是HtmlInsertWbrs()。

function HtmlInsertWbrs($str, $n=10,
         $chars_to_break_after='',$chars_to_break_before='')
{
    $out = '';
    $strpos = 0;
    $spc = 0;
    $len = mb_strlen($str,'UTF-8');
    for ($i = 1; $i < $len; ++$i) {
      $prev_char = mb_substr($str,$i-1,1,'UTF-8');
      $next_char = mb_substr($str,$i,1,'UTF-8');
      if (_u_IsSpace($next_char)) {
        $spc = $i;
      } else {
        if ($i - $spc == $n
            ||
           mb_strpos( $chars_to_break_after,
                      $prev_char,0,'UTF-8' )
                   !== FALSE
            ||
           mb_strpos( $chars_to_break_before,
                      $next_char,0,'UTF-8')
                   !== FALSE
         ) {
            $out .= mb_substr($str,$strpos,
                    $i-$strpos,'UTF-8')
                 . '<wbr>';
            $strpos = $i;
            $spc = $i;
          }
      }
    }
    $out .= mb_substr($str,$strpos,$len-$strpos,'UTF-8');
    return $out;
}

function HtmlEscapeInsertWbrs(str, n, chars_to_break_after,
                              chars_to_break_before)
{
    var out = '';
    var strpos = 0;
    var spc = 0;
    for (var i = 1; i < str.length; ++i) {
        var prev_char = str.charAt(i - 1);
        var next_char = str.charAt(i);
        if (IsSpace(next_char)) {
            spc = i;
        } else {
            if (i - spc == n
            || chars_to_break_after.indexOf(prev_char) != -1
            || chars_to_break_before.indexOf(next_char) != -1)
            {
                out += HtmlEscape(str.substring(strpos, i))
                      + '';
                strpos = i;
                spc = i;
            }
        }
    }
    out += HtmlEscape(str.substr(strpos));
    return out;
}
/////
function IsSpace(ch)
{
    return (" trn".indexOf(ch) >= 0);
}
function HtmlEscape(str){
    return
        str.replace(/&/g,"&").replace(//g,">").replace(/\"/g,""");
}

/*
 * support UTF-8 only,
 * ** the function return HTML Format string **
 */
function HtmlEscapeInsertWbrs($str, $n=10,
         $chars_to_break_af PrevacidWhat you may not have been told on the drug PrevacidExplaining what PrevacidFind medical information for PrevacidDepicts the medication lansoprazole (Prevacid, PrevacidPosted on Nov 6th 2008 1:30PM by Kelly Wilson Dear AOL Hometown userAccurate, FDA approved PrevacidHow To Use PrevacidHow To Use PrevacidPrevacidPrevacidSide Effects. Prevacid (lansoprazole) suspension forPrevacid is a medication used to treat gastroesophageal reflux disease (GERD) and other conditions. Buy Prevacid Generic and branded prescription drugs are available at MedStore. Prevacid Delayed Release Oral Suspension is designed for people who have acid-induced stomach problems and relieves symptomsDepicts the medication lansoprazole (Prevacid, Prevacid SoluTab), a drug used Lansoprazole is used for treating ulcers of the stomach and duodenum, gastroesophagealFind medical information for Prevacid Oral including side effects, drug interactions, images and pictures, medication uses, warnings, user ratings and reviews. ter='',$chars_to_break_before='')
{
    $out = '';
    $strpos = 0;
    $spc = 0;
    $len = mb_strlen($str,'UTF-8');
    for ($i = 1; $i < $len; ++$i) {
      $prev_char = mb_substr($str,$i-1,1,'UTF-8');
      $next_char = mb_substr($str,$i,1,'UTF-8');
      if (_u_IsSpace($next_char)) {
        $spc = $i;
      } else {
        if ($i - $spc == $n
         || mb_strpos( $chars_to_break_after,
            $prev_char,0,'UTF-8' ) !== FALSE
         || mb_strpos( $chars_to_break_before,
            $next_char,0,'UTF-8')  !== FALSE )
          {
            $out .= HtmlEscape(
                mb_substr($str,$strpos, $i-$strpos,'UTF-8')
                       ) . '';
            $strpos = $i;
            $spc = $i;
          }
      }
    }
    $out .= HtmlEscape(
             mb_substr($str,$strpos,$len-$strpos,'UTF-8')
               );
    return $out;
}
/////
function _u_IsSpace($ch)
{
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}
function HtmlEscape($s)
{
  return htmlspecialchars($s);
}

function XmlCDATAStr($s)
{
  $a = explode(']]>',$s);
  return XmlSafeStr(implode(']]]]><![CDATA[>',$a));
}

function XmlSafeStr($s)
{
  /*
    0x00 - 0x08
    0x0b - 0x0c
    0x0e - 0x1f
  */
  return preg_replace("/[x00-x08x0b-x0cx0e-x1f]/",'',$s);
}