PHP / HTML打印两个变量之间用下划线？

Question

Hello StackOverflow Community,
I want to be able to echo that a file is uploaded in upload/FirstName_LastName_FileName.ext format. In my PHP file, I have this HTML here:

<td>File Stored in:</td>
<td>upload/$uploadName_$filename</td>

but it seems that this code returns upload/$filename. How can I remedy this situation? I'm very new to this so help is greatly appreciated!

EDIT: I was too hasty in trying to get this question answered that I didn't provide enough information. I actually could not use the PHP tags since it was going to be embedded into the message of the mail function. So I found a way by assigning a new variable $uploadPath to the code. The line now looks lke this:

   $uploadPath = "upload/" . $uploadName . "_" . $filename;
   // mail to, subject, message and its table...
   <td>File Stored in:</td>
   <td>$uploadPath</td>

Even still, thank you all for your quick answers! I gave the fastest the checkmark.

Answer 1

There's a lot of ways to do this. Here's a few:

<td>upload/<?= $uploadName,'_',$filename; ?></td>

<td>upload/<?= $uploadName.'_'.$filename; ?></td>

<td>upload/<?php printf("%s_%s", $uploadName, $filename; ?></td>

<td>upload/<?= $uploadName; ?>_<?= $filename; ?></td>

<td>upload/<?= "{$uploadName}_{$filename}"; ?></td>