move_uploaded_file和副本

Question

我正在尝试上传tmp文件然后复制它。但它没有出现在第二个文件夹中，是否有覆盖物或我需要观看的东西？

$uploadPath = '/.../..../image/';
$uploadPathpreview = '/.../..../blog/';

if ($counter == 0){
$preview_file = $uploadPath . DS . 'preview_' . date("Ymd-Hi-") . $img_name;
$preview_file_save = $uploadPathpreview . DS . 'preview_' . date("Ymd-Hi-") . $img_name;
if(move_uploaded_file($tmp_name, $preview_file)){
    $tmp = $preview_file;
    $new = $preview_file_save;
                                }
copy($tmp,$new);      

顺便提一下图像中的文件。我尝试了没有if（）