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HomeBackend DevelopmentPHP Tutorialphp实现遍历目录并删除指定文件中指定内容_PHP

现在正坐在安静的寝室里,寒假俨然已经离我而去了……今天发的是我寒假里搞的最后一次学习,之后的时间就一直在看海贼王了。

以前写过一个C语言的遍历目录+复制文件的程序,很长很复杂,现在用PHP一样可以实现遍历目录,而代码就短了不少。这个程序目的是遍历目录,找到所有指定文件名的文件,并删除其中指定的字符串。

 

代码如下:


 //功能:删除指定目录(包括子目录)下所有指定文件中指定字符串

 

 $tmpfiledir = $_SERVER["DOCUMENT_ROOT"].'tmp.txt';
 function del($getstr)
 {
  $isbak = true; //是否备份原文件,true为备份,false不备份
  global $tmpfiledir;
  $fr = fopen($tmpfiledir,"r") or die('未能打开临时文件');
  while($row = fgets($fr))
  {
   if(empty($row)) break;
   $row = trim($row);
   $opp = fopen($row,"r") or die("未能打开$row");
   $str = fread($opp,filesize($row)) or die("不能读$row");
   $str = str_replace($getstr,"",$str);
   fclose($opp);
   if($isbak){
    copy($row,$row.'.bak') or die("备份文件失败");
    }
   $ref = fopen($row,"w") or die("重新打开文件失败");
   fwrite($ref,$str) or die("重新写入文件失败");
  }
 }
 
  function traverse($path) {
    global $name,$tmpfiledir;
   $current_dir = opendir($path);    //opendir()返回一个目录句柄,失败返回false
   if($current_dir == false)
    return false;
   while(($file = readdir($current_dir)) !== false) {    //readdir()返回打开目录句柄中的一个条目
    $sub_dir = $path . DIRECTORY_SEPARATOR . $file;    //构建子目录路径
    if($file == '.' || $file == '..') {
     continue;
    } else if(is_dir($sub_dir)) {    //如果是目录,进行递归
     traverse($sub_dir);
    } else {    //如果是文件,再做比较
     $fileinfo = pathinfo($sub_dir);
     if($fileinfo['basename'] == $name)
     {
       $fopen = fopen($tmpfiledir,"a");
       fwrite($fopen,$sub_dir."\r\n");
       fclose($fopen);
      }
    }
   }
   return true;
  }
 
  if(isset($_POST["name"]) && isset($_POST["dir"]) && isset($_POST["str"]))
  {
    $name = $_POST["name"];
    traverse($_POST["dir"]) or die("未能创建临时文件,请检查网站根目录是否可写");
    del($_POST["str"]);
             echo "成功";
    unlink($tmpfiledir);
   }
   else
   {
     echo "

输入相关信息

";
    }
?>

输入目标文件夹:
输入目标文件名:
输入需要删除的字符串:

 

 

 

你们可以看到我写了两个函数,函数traverse将查找到的指定文件路径写在一个临时文件里,函数del删除这些文件里的指定字符串。其实我也觉得很鸡肋,直接在遍历的时候删除就可以了,根本不用生成什么临时文件。

其实我一开始是用C语言写好的遍历,因为C语言不好对文件操作所以才用php写删除的部分,所以一开始只写了一个del函数,后来干脆把遍历文件也用php写了(似乎比C简单的多),所以又写了一个函数traverse。大家只管看遍历的部分就成,也可以和我之前用C写的遍历的代码对比(我发了源代码的),看看有什么不同。

不过这个版本不支持通配符,所以文件名必须要指定。作用嘛(也是我写这个的理由),可以批量删除我们挂在服务器上的一句话木马。

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