I think i indicated a wrong syntax in my first reply (my bad!)
Please, try with this snippet :
<?php $field = get_field(‘field_name’); ?>
<article id=”post-<?php the_ID(); ?>” <?php post_class(‘et_pb_post clearfix’ . $no_thumb_class . $overlay_class . $field) ?>>
To keep it simple, the post_class() function could take two optional parameters : $class and $post_id.
(you don’t need the $post_id as you want to add a class in all blog posts).
To add multiple $variables to the $class parameter, Divi simply use the php concatenation.
(see php documentation about concatenation, it’s useful : https://www.php.net/manual/en/language.operators.string.php).
So with the snippet above, you stock the value of your field.
Then you use it as a $variable like the other divi $variable.
Let me know if it helps.
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