PHP 创建文件夹的自定义函数

<?php
/**
* 创建文件夹的函数
* edit: www.jb200.com
*/
function CreateFolder( $resourceType, $currentFolder )
{
 if (!isset($_GET)) {
  global $_GET;
 }
 $sErrorNumber = '0' ;
 $sErrorMsg  = '' ;

 if ( isset( $_GET['NewFolderName'] ) )
 {
  $sNewFolderName = $_GET['NewFolderName'] ;
  $sNewFolderName = SanitizeFolderName( $sNewFolderName ) ;

  if ( strpos( $sNewFolderName, '..' ) !== FALSE )
   $sErrorNumber = '102' ;  // Invalid folder name.
  else
  {
   // Map the virtual path to the local server path of the current folder.
   $sServerDir = ServerMapFolder( $resourceType, $currentFolder, 'CreateFolder' ) ;

   if ( is_writable( $sServerDir ) )
   {
    $sServerDir .= $sNewFolderName ;

    $sErrorMsg = CreateServerFolder( $sServerDir ) ;

    switch ( $sErrorMsg )
    {
     case '' :
      $sErrorNumber = '0' ;
      break ;
     case 'Invalid argument' :
     case 'No such file or directory' :
      $sErrorNumber = '102' ;  // Path too long.
      break ;
     default :
      $sErrorNumber = '110' ;
      break ;
    }
   }
   else
    $sErrorNumber = '103' ;
  }
 }
 else
  $sErrorNumber = '102' ;

 // 显示错误消息
 echo '<Error number="' . $sErrorNumber . '" originalDescription="' . ConvertToXmlAttribute( $sErrorMsg ) . '" />' ;
}