php 读取文件夹与文件夹中文件的函数

<?php
/**
* 读取文件夹及其中文件的函数
* edit: www.jb200.com
*
*/
function GetFoldersAndFiles( $resourceType, $currentFolder )
{
 // Map the virtual path to the local server path.
 $sServerDir = ServerMapFolder( $resourceType, $currentFolder, 'GetFoldersAndFiles' ) ;

 // Arrays that will hold the folders and files names.
 $aFolders = array() ;
 $aFiles  = array() ;

 $oCurrentFolder = opendir( $sServerDir ) ;

 while ( $sFile = readdir( $oCurrentFolder ) )
 {
  if ( $sFile != '.' && $sFile != '..' )
  {
   if ( is_dir( $sServerDir . $sFile ) )
    $aFolders[] = '<Folder name="' . ConvertToXmlAttribute( $sFile ) . '" />' ;
   else
   {
    $iFileSize = @filesize( $sServerDir . $sFile ) ;
    if ( !$iFileSize ) {
     $iFileSize = 0 ;
    }
    if ( $iFileSize > 0 )
    {
     $iFileSize = round( $iFileSize / 1024 ) ;
     if ( $iFileSize < 1 ) $iFileSize = 1 ;
    }

    $aFiles[] = '<File name="' . ConvertToXmlAttribute( $sFile ) . '" size="' . $iFileSize . '" />' ;
   }
  }
 }

 // Send the folders
 natcasesort( $aFolders ) ;
 echo '<Folders>' ;

 foreach ( $aFolders as $sFolder )
  echo $sFolder ;

 echo '</Folders>' ;

 // Send the files
 natcasesort( $aFiles ) ;
 echo '<Files>' ;

 foreach ( $aFiles as $sFiles )
  echo $sFiles ;

 echo '</Files>' ;
}