php实现文件上传的程序代码

      
        //判断临时文件存放路径是否包含用户上传的文件
        if(is_uploaded_file($_FILES["uploadfile"]["tmp_name"])){
        //为了更高效，将信息存放在变量中
        $upfile=$_FILES["uploadfile"];//用一个数组类型的字符串存放上传文件的信息
        //print_r($upfile);//如果打印则输出类似这样的信息Array ( [name] => m.jpg [type] => image/jpeg [tmp_name] => C:WINDOWSTempphp1A.tmp [error] => 0 [size] => 44905 )
        $name=$upfile["name"];//便于以后转移文件时命名
        $type=$upfile["type"];//上传文件的类型
        $size=$upfile["size"];//上传文件的大小
        $tmp_name=$upfile["tmp_name"];//用户上传文件的临时名称
        $error=$upfile["error"];//上传过程中的错误信息
        //echo $name;
        //对文件类型进行判断，判断是否要转移文件,如果符合要求则设置$ok=1即可以转移
        switch($type){
            case "image/jpg": $ok=1;
            break;
            case "image/jpeg": $ok=1;
            break;
            case "image/gif" : $ok=1;
            break;
            default:$ok=0;
            break;
        }
        //如果文件符合要求并且上传过程中没有错误
        if($ok&&$error=='0'){
            //调用move_uploaded_file（）函数，进行文件转移
            move_uploaded_file($tmp_name,'up/'.$name);
            //操作成功后，提示成功
            echo "<script language="javascript">alert('succeed')</script>";
        }else{
            //如果文件不符合类型或者上传过程中有错误，提示失败
            echo "<script language="javascript">alert('failed')</script>";
        }
    }
?>

function FileUpload( $resourceType, $currentFolder, $sCommand )
{
 if (!isset($_FILES)) {
  global $_FILES;
 }
 $sErrorNumber = '0' ;
 $sFileName = '' ;

 if ( isset( $_FILES['NewFile'] ) && !is_null( $_FILES['NewFile']['tmp_name'] ) )
 {
  global $Config ;

  $oFile = $_FILES['NewFile'] ;

  // Map the virtual path to the local server path.
  $sServerDir = ServerMapFolder( $resourceType, $currentFolder, $sCommand ) ;

  // Get the uploaded file name.
  $sFileName = $oFile['name'] ;
  $sFileName = SanitizeFileName( $sFileName ) ;

  $sOriginalFileName = $sFileName ;

  // Get the extension.
  $sExtension = substr( $sFileName, ( strrpos($sFileName, '.') + 1 ) ) ;
  $sExtension = strtolower( $sExtension ) ;

  if ( isset( $Config['SecureImageUploads'] ) )
  {
   if ( ( $isImageValid = IsImageValid( $oFile['tmp_name'], $sExtension ) ) === false )
   {
    $sErrorNumber = '202' ;
   }
  }

  if ( isset( $Config['HtmlExtensions'] ) )
  {
   if ( !IsHtmlExtension( $sExtension, $Config['HtmlExtensions'] ) &&
    ( $detectHtml = DetectHtml( $oFile['tmp_name'] ) ) === true )
   {
    $sErrorNumber = '202' ;
   }
  }

  // Check if it is an allowed extension.
  if ( !$sErrorNumber && IsAllowedExt( $sExtension, $resourceType ) )
  {
   $iCounter = 0 ;

   while ( true )
   {
    $sFilePath = $sServerDir . $sFileName ;

    if ( is_file( $sFilePath ) )
    {
     $iCounter++ ;
     $sFileName = RemoveExtension( $sOriginalFileName ) . '(' . $iCounter . ').' . $sExtension ;
     $sErrorNumber = '201' ;
    }
    else
    {
     move_uploaded_file( $oFile['tmp_name'], $sFilePath ) ;

     if ( is_file( $sFilePath ) )
     {
      if ( isset( $Config['ChmodOnUpload'] ) && !$Config['ChmodOnUpload'] )
      {
       break ;
      }

      $permissions = 0777;

      if ( isset( $Config['ChmodOnUpload'] ) && $Config['ChmodOnUpload'] )
      {
       $permissions = $Config['ChmodOnUpload'] ;
      }

      $oldumask = umask(0) ;
      chmod( $sFilePath, $permissions ) ;
      umask( $oldumask ) ;
     }

     break ;
    }
   }

   if ( file_exists( $sFilePath ) )
   {
    //previous checks failed, try once again
    if ( isset( $isImageValid ) && $isImageValid === -1 && IsImageValid( $sFilePath, $sExtension ) === false )
    {
     @unlink( $sFilePath ) ;
     $sErrorNumber = '202' ;
    }
    else if ( isset( $detectHtml ) && $detectHtml === -1 && DetectHtml( $sFilePath ) === true )
    {
     @unlink( $sFilePath ) ;
     $sErrorNumber = '202' ;
    }
   }
  }
  else
   $sErrorNumber = '202' ;
 }
 else
  $sErrorNumber = '202' ;

 $sFileUrl = CombinePaths( GetResourceTypePath( $resourceType, $sCommand ) , $currentFolder ) ;
 $sFileUrl = CombinePaths( $sFileUrl, $sFileName ) ;

 SendUploadResults( $sErrorNumber, $sFileUrl, $sFileName ) ;

 exit ;