Bucket - Show Captions for Featured Images

header-single.php

<?php
if (has_post_thumbnail()):
    // $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'blog-big' );
    //
	$featured_image_ID = get_post_thumbnail_id( $post->ID );
    $image = wp_get_attachment_image_src( $featured_image_ID, 'blog-big' );
    $image_medium = wp_get_attachment_image_src( $featured_image_ID, 'blog-medium' );


    // Get the image meta informations
    function wp_get_attachment( $attachment_id ) {
		$attachment = get_post( $attachment_id );
		return array(
		    'alt' => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
		    'caption' => $attachment->post_excerpt,
		    'description' => $attachment->post_content,
		    'href' => get_permalink( $attachment->ID ),
		    'src' => $attachment->guid,
		    'title' => $attachment->post_title
		);
	}
    $image_caption =  wp_get_attachment ( $featured_image_ID );

	// $image = wp_get_attachment_image_src(get_post_thumbnail_id(), 'blog-big');
	$image_ratio = 70; //some default aspect ratio in case something has gone wrong and the image has no dimensions - it happens
    if (isset($image[1]) && isset($image[2]) && $image[1] > 0) {
		$image_ratio = $image[2] * 100/$image[1];
	}

	// let's get to know this post a little better
	$full_width_featured_image = get_post_meta(wpgrade::lang_post_id(get_the_ID()), '_bucket_full_width_featured_image', true);
	$disable_sidebar = get_post_meta(wpgrade::lang_post_id(get_the_ID()), '_bucket_disable_sidebar', true);

	// let's use what we know
	$content_width = $disable_sidebar == 'on' ? 'one-whole' : 'two-thirds';
	$featured_image_width = $full_width_featured_image == 'on' || $disable_sidebar == 'on' ? 'one-whole' : 'two-thirds  palm-one-whole';
?>

    <div class="grid__item  float--left  <?php echo $featured_image_width; ?>  article__featured-image">
        <div class="image-wrap" style="padding-top: <?php echo $image_ratio; ?>%">
	        <?php if (wpgrade::option('enable_lazy_loading_images')) : ?>
                <img class="riloadr-single" data-src-big="<?php echo $image[0]; ?>" data-src-small="<?php echo $image_medium[0]; ?>" alt="<?php echo get_the_title($featured_image_ID) ?>" />
			<?php else : ?>
		        <img src="<?php echo $image[0]; ?>" alt="<?php echo get_the_title($featured_image_ID) ?>" />
			<?php endif; ?>
        </div>
       <div class="wp-caption"><p class="wp-caption-text"><?php echo $image_caption['caption']; ?></p></div> 
    </div>

<?php endif; ?>