downmix.helper.php
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<?php
/**
* 防采集混淆字符串
*
* @version $Id: downmix.inc.php 1 9:14 2010年7月6日Z tianya $
* @package DedeCMS.Libraries
* @copyright Copyright (c) 2007 - 2010, DesDev, Inc.
* @license http://help.dedecms.com/usersguide/license.html
* @link http://www.dedecms.com
*/
/**
* 混淆字符串内容
*
* @access public
* @param string $body 内容
* @return string
*/
if ( ! function_exists('RndString'))
{
function RndString(&$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; }";
$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);
$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(DEDEDATA.'/downmix.data.php','r');
$start = 0;
$totalitem = 0;
while(!feof($fp))
{
$v = trim(fgets($fp,128));
if($start==1)
{
if(preg_match("/#end#/i", $v))
{
break;
}
if($v!='')
{
$totalitem++; $rndstring[$totalitem] = preg_replace("/#,/", "", $v);
}
}
if(preg_match("/#start#/i", $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];
}
}
}
return $reString;
}//函数结束
}