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PHP performs related operations on folders (traversing, calculating size),
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PHP performs related operations on folders (traversing, calculating size), _PHP tutorial

Jul 12, 2016 am 09:05 AM
php folder

shares the first operation content with you: Traverse and print all files in the specified directory

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<&#63;php

//功能:遍历并打印指定目录下所有文件

  

function scan_dir($dir_name,$dir_flag=1) {

  static $FILE_COUNT=1;        //记录文件数目 初值为1 目录名称不记

  $FILE_COUNT--;            //每调用一次scan_dir()函数自减1

  @$dir_handle=opendir($dir_name);   //抑制错误信息显示 便于自定义错误显示

  if(!$dir_handle)

  die("目录打开错误!");

  while(false!==($filename=readdir($dir_handle))) //文件名为‘0'时,readdir返回 FALSE,判断返回值是否不全等

  {                  

  

    $flag=$dir_flag;         //古怪的 is_dir($filename) ! $filename这个路径必须能够寻到!当$filename不存在或者不是目录时返回false

    if($filename!='.'&&$filename!='..')

    {

      $FILE_COUNT++;          //不记录当前路径和上一级路径

      while($flag>0&&--$flag)     //负数仍为真

        echo '&nbsp';

      if(is_dir($dir_name.$filename)) //判断 是否为一个目录

      {

        echo '<strong>'."<a href=".$dir_name.$filename.">".$filename."</a></strong><br>";

        scan_dir($dir_name.$filename.'/',$dir_flag+1);   //$dir_flag标志目录树层次

      }

      else 

      {

        echo "<a href=".$dir_name.$filename.">".$filename."</a><br>";

      }

    }

  }

  closedir($dir_handle);         //关闭目录句柄

  echo "文件总数:".$FILE_COUNT.'<br>';

}

  

scan_dir('D:/AppServ/www/mytest/shopping/payment/');

  

  

/*总结:

1,关于路径 目录的路径末尾都加上 '/' 以便后面与文件名字符串连接 形成新的 路径字符串

2,目录遍历 这是一个关于树的问题

3,is_dir()函数第一个参数必须是一个能够识别的PATH否则会因目录不存在而返回一个false容易误解

得出 “这不是一个目录”的错误结论 形成逻辑上的错误

4,注意当前路径'.'和上一级路径'..'的剔除 否则 在递归环节造成死循环 直至内存耗尽出错。

5,dir_flag这个变量是记录树的深度 以便于目录分级分层输出                */

/*不足

1,输出排版不完善

2,逻辑与表示层混乱 不分明 大忌!

3,面向过程

*/

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#####Single Directory#####

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// 列出目录内容 $dir 不要加 '/'

function list_files($dir)

{

  if(is_dir($dir))

  {

    if($handle = opendir($dir))

    {

      while(($file = readdir($handle)) !== false)

      {

        if($file != "." && $file != ".." && $file != "Thumbs.db")

        {

          echo '<a href="'.$dir.'/'.$file.'">'.$file.'</a><br>'."\n";

        }

      }

      closedir($handle);

    }

  }

}

  

list_files('D:/AppServ/www/mytest/shopping/payment');

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The second operation content of PHP on files: Get the folder size and calculate the file

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<&#63;php 

function getDirSize($dir)

{

  $handle = opendir($dir);

  while (false!==($FolderOrFile = readdir($handle)))

  {

    if($FolderOrFile != "." && $FolderOrFile != "..")

    {

      if(is_dir("$dir/$FolderOrFile"))

      {

        $sizeResult += getDirSize("$dir/$FolderOrFile");

      }

      else

      {

        $sizeResult += filesize("$dir/$FolderOrFile");

      }

    }  

  

  closedir($handle);

  return $sizeResult;

}

  

//单位自动转换函数

function getRealSize($size)

{

  $kb = 1024;     //Kilobyte

  $mb = 1024 * $kb//Megabyte

  $gb = 1024 * $mb//Gigabyte

  $tb = 1024 * $gb//Terabyte

      

  if($size < $kb)

  {

    return $size." B";

  }

  else if($size < $mb)

  {

    return round($size/$kb,2)." KB";

  }

  else if($size < $gb)

  {

    return round($size/$mb,2)." MB";

  }

  else if($size < $tb)

  {

    return round($size/$gb,2)." GB";

  }

  else

  {

    return round($size/$tb,2)." TB";

  }

}

  

echo getRealSize(getDirSize('D:/AppServ/www/mytest/'));

  

  

  

// get byte

function dirsize($dir)

{

  $handle=opendir($dir);

  $size = 0;

  while ( $file=readdir($handle) )

  {

  if ( ( $file == "." ) || ( $file == ".." ) ) continue;

  if ( is_dir("$dir/$file") )

  $size += dirsize("$dir/$file");

  else

  $size += filesize("$dir/$file");

  }

  closedir($handle);

  return $size;

}

  

$big=dirsize(dirname($_SERVER['SCRIPT_FILENAME'])."/");

echo '('.$big.' bytes)';

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The above is about the basic operations of PHP on folders. I hope it will be helpful to everyone's learning.

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1067826.htmlTechArticlephp performs related operations on folders (traversing, calculating size), and the first operation content to share with you: Traverse and print all files in the specified directory php //Function: Traverse and print the instructions...
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