upload file function

/* written by LiYongQuan */

function
up_file($UploadFile,$UploadPath,$FName,$UploadFile_size,$isover=0,$TimeLimit=60)
  {
    // $UploadFile:  source file
    // $UploadPath: destination path
    // $FName: destination file
    // $UploadFile_size: source file size
    // $isover: if destination is aleady exist, overwrite? 0-No;1-Yes
    //$TimeLimit: set_time_limit=?
    //example:up_file($UploadFile,$dis,$UploadFile_name,$UploadFile_size,0,60);

    set_time_limit($TimeLimit);
    $FileName = AddSlashes($UploadPath).$FName;
    if(($UploadFile =="none") || ($UploadFile == ""))
 {echo("You didn't choice any file!");
  return(1);
 }

    if(($FileName =="none") || ($FileName == ""))
 {echo("You didn't supply destination file!");
  return(2);
 }

    $FileName = AddSlashes($UploadPath).$FName;
    if($UploadFile_size<1024)
       {$FileSize=(string)$UploadFile_size."byte";}
    elseif($UploadFile_size<(1024*1024))
       {$FileSize=number_format((double)($UploadFile_size/1024),1)."KB";}
    else
       {$FileSize=number_format((double)($UploadFile_size/(1024*1024)),1)."MB";}
 
    if(!file_exists($FileName) || $isover)
 {if(copy($UploadFile,$FileName))
     {echo("File1: $FName($FileSize) upload successful!");
      return(0);
     }
  else
     {echo("File: $FName($FileSize) upload failed!");
      return(3);
     }
 }
    else
 if(file_exists($FileName))
      {echo("File: $FName already exist!");
       return(3);
      }
 

    unlink($UploadFile);
    set_time_limit(30);
  }  

?>