PHP 代码：【复制】 
function RndString($body) 
{ 
  //最大间隔距离(如果在检测不到p标记的情况下，加入混淆字串的最大间隔距离) 
  $maxpos = 1024; 
  //font 的字体颜色 
  $fontColor = "#FFFFFF"; 
  //div span p 标记的随机样式 
  $st1 = chr(mt_rand(ord('A'),ord('Z'))).chr(mt_rand(ord('a'),ord('z'))).chr(mt_rand(ord('a'),ord('z'))).mt_rand(100,999); 

  $st2 = chr(mt_rand(ord('A'),ord('Z'))).chr(mt_rand(ord('a'),ord('z'))).chr(mt_rand(ord('a'),ord('z'))).mt_rand(100,999); 

  $st3 = chr(mt_rand(ord('A'),ord('Z'))).chr(mt_rand(ord('a'),ord('z'))).chr(mt_rand(ord('a'),ord('z'))).mt_rand(100,999);
  $st4 = chr(mt_rand(ord('A'),ord('Z'))).chr(mt_rand(ord('a'),ord('z'))).chr(mt_rand(ord('a'),ord('z'))).mt_rand(100,999); 

  $rndstyle[1]['value'] = ".{$st1} { display:none; }"; 
  $rndstyle[1]['name'] = $st1; 
  $rndstyle[2]['value'] = ".{$st2} { display:none; }"; //oSPHP.COM.CN 
  $rndstyle[2]['name'] = $st2; 
  $rndstyle[3]['value'] = ".{$st3} { display:none; }"; 
  $rndstyle[3]['name'] = $st3; 

  $rndstyle[4]['value'] = ".{$st4} { display:none; }"; 
  $rndstyle[4]['name'] = $st4; 
  $mdd = mt_rand(1,4);  
  //以后内容如果你不懂其含义，请不要改动 
  //--------------------------------------------------- 
  $rndstyleValue = $rndstyle[$mdd]['value']; 
  $rndstyleName = $rndstyle[$mdd]['name']; 
  $reString = "<style> $rndstyleValue </style>\r\n"; 
  //附机标记 
  $rndem[1] = 'font'; 
  $rndem[2] = 'div'; 
  $rndem[3] = 'span'; 
  $rndem[4] = 'p'; 
  //读取字符串数据 
  $fp = fopen(dirname(__FILE__).'/RndString.php','r'); 
  $start = 0; 
  $totalitem = 0; 
  while(!feof($fp)){ 

       $v = trim(fgets($fp,128)); 
       if($start==1){ 
            if(ereg("#end#",$v)) break; 
            if($v!=""){ $totalitem++; $rndstring[$totalitem] = ereg_replace("#,","",$v); }  
       } 
       if(ereg("#start#",$v)){ $start = 1; } 
  } 
  fclose($fp); 
  //处理要防采集的字段 
  $bodylen = strlen($body) - 1;  
  $prepos = 0; 
  for($i=0;$i<=$bodylen;$i++){ 
      if($i+2 >= $bodylen || $i<50) $reString .= $body[$i];  
      else{ 
        @$ntag = strtolower($body[$i].$body[$i+1].$body[$i+2]); 
        if($ntag=='</p' || ($ntag=='<br' && $i-$prepos>$maxpos) ){ 

             $dd = mt_rand(1,4); 
             $emname = $rndem[$dd]; 
             $dd = mt_rand(1,$totalitem); 

             $rnstr = $rndstring[$dd]; 
             if($emname!='font') $rnstr = " <$emname class='$rndstyleName'>$rnstr</$emname> "; 
             else  $rnstr = " <font color='$fontColor'>$rnstr</font> "; 

             $reString .= $rnstr.$body[$i]; 
             $prepos = $i; 
        } 
        else $reString .= $body[$i];  
    } 
  } 
  unset($body); 
  return $reString; 
}//函数结束