Display WP featured image captions and descriptions

wp-display-image-captions.php

<?php
        /* Only display to logged in users */
        if ( is_user_logged_in() ) {

	        /* Displaying the image caption and description */
	        $thumb_img = get_post( get_post_thumbnail_id() ); // Get post by ID
	        echo '<p>The Caption: ' . $thumb_img->post_excerpt . '<br>'; // Display Caption
	        echo 'The Description: ' . $thumb_img->post_content . '</p> '; // Display Description

	        /* Displaying the image alt text */
	        $thumb_img_meta = get_post_meta( get_post_thumbnail_id() ); // Get post meta by ID
	        echo $thumb_img_meta['_wp_attachment_image_alt']['0']; // Display Alt text

        } else {
            echo '';
        }
    ?>

<?php the_post_thumbnail_caption(); ?>