Empty alt tags wordpress

I’m using WordPress with Listingpro template, I’ve been looking around for a solution and I’ve found the following:

// An attachment/image ID is all that's needed to retrieve its alt and title attributes.
$image_id = get_post_thumbnail_id();    
$image_alt = get_post_meta($image_id, '_wp_attachment_image_alt', TRUE);  
$image_title = get_the_title($image_id);

JavaScript
​x
 
// An attachment/image ID is all that's needed to retrieve its alt and title attributes.$image_id = get_post_thumbnail_id();    $image_alt = get_post_meta($image_id, '_wp_attachment_image_alt', TRUE);  $image_title = get_the_title($image_id);​

But, when I add this alt='$image_alt' showed me an empty alt.

Answer

<img src="whatever-src" alt="'.$image_alt.'">

JavaScript
 
<img src="whatever-src" alt="'.$image_alt.'">​

This is what you need, when it is inside echo. Only if there is any alt associated with that image.

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Answer