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HomeBackend DevelopmentPHP TutorialPHP performs related operations on folders (traversing, calculating size), _PHP tutorial

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

<&#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
*/

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

// 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'); 

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

<&#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)'; 

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

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