What is the best way to write this condition?

Question

PHP

Hello!
There is the following block in the layout:

<p class="fileDescription">%'file_description'%</p>

. We need to make it so that we can determine how many characters (total number) will appear between the tags <p></p>, and if there are no characters at all, then assign this one <p> display=none.
Thank you!
udp
------------
Let's complicate the task.
There is

<p class="fileDescription">Описание: <span>%'file_description'%</span></p>

We need to understand if there are any characters between the given span, and if they are not there, then in P display display=none ...

Answer 1

p:empty {
   display: none;
}

https://css-tricks.com/almanac/selectors/e/empty/

Answer 2

jQuery:

$(function(){
     $(".fileDescription span:empty").parent().hide();
});

Answer 3

It is possible like this:

<?php $description = 'file_description'; ?>
<p class="fileDescription"<?php if (!strlen($description)) echo ' style="display: none"'; ?>>
    Описание: <span><?php echo $description; ?></span>
</p>

Or like this:

<style>
    .hidden {
        display: none;
    }
</style>
<?php $description = 'file_description'; ?>
<p class="fileDescription<?php if (!strlen($description)) echo ' hidden'; ?>">
    Описание: <span><?php echo $description; ?></span>
</p>

Or wait until :has() appears in CSS and browsers start supporting it:

.fileDescription:has(span:empty) {
    display: none;
}