Else/If Statement to Display Photo Descriptions

Question

I am building a news WordPress theme and using the Description for thumbnails to display who the photo is credited to on the website. I am then placing the credits in the Description on top of the photo using the following code. However, when the photo has no Description/credit, I do not want the description to show because the background color and padding for the Description/credit then create an empty, colored box.

I am hoping that somebody can help me with the proper if statement that will only display the Description/credit if one exists. The description is being pulled via get_post(get_post_thumbnail_id())->post_content in the code below.

<div style="position: relative">
<?php the_post_thumbnail('large');
 echo '<span style="position:absolute; bottom:9px; right:0; color:#FFF; background:rgba(0,0,0,0.8); padding:4px 6px; font-size:0.7em">';
echo get_post(get_post_thumbnail_id())->post_content;
echo '</span>'; ?>
</div>

Answer 1

How about like this:

<div style="position: relative">
<?php the_post_thumbnail('large');
$imagedesc = get_post(get_post_thumbnail_id())->post_content;
if(!empty($imagedesc)) {
   echo '<span style="position:absolute; bottom:9px; right:0; color:#FFF; background:rgba(0,0,0,0.8); padding:4px 6px; font-size:0.7em">';
   echo $imagedesc;
   echo '</span>';
} ?>
</div>