//禁止用户提交某些特殊变量

$ckvs = Array('_GET','_POST','_COOKIE','_FILES');

foreach($ckvs as $ckv){

 if(is_array($$ckv)){

   foreach($$ckv AS $key => $value)

     if(eregi("^(cfg_|globals)",$key)) unset(${$ckv}[$key]);

 }

}

//把get、post、cookie里的<? 替换成 <?

$ckvs = Array('_GET','_POST','_COOKIE');

foreach($ckvs as $ckv){

 if(is_array($$ckv)){

   foreach($$ckv AS $key => $value)

     if(!empty($value)){

       ${$ckv}[$key] = str_replace('<'.'?','&'.'lt;'.'?',$value);

       ${$ckv}[$key] = str_replace('?'.'>','?'.'&'.'gt;',${$ckv}[$key]);

     }

     if(eregi("^cfg_|globals",$key)) unset(${$ckv}[$key]);

 }

}

//检测上传的文件中是否有PHP代码，有直接退出处理

if (is_array($_FILES)) {

foreach($_FILES AS $name => $value){

 ${$name} = $value['tmp_name'];

 $fp = @fopen(${$name},'r');

 $fstr = @fread($fp,filesize(${$name}));

 @fclose($fp);

 if($fstr!='' && ereg("<\?",$fstr)){

     echo "你上传的文件中含有危险内容，程序终止处理！";

     exit();

 }

}

}