<div id="related-post">
<h3>関連記事</h3>
<div class="related-post-list">
<?php
$categories = get_the_category($post->ID);
$category_ID = array();
foreach($categories as $category):
array_push( $category_ID, $category -> cat_ID);
endforeach ;
$args = array(
'post__not_in' => array($post -> ID),
'posts_per_page'=> 9,//表示件数
'category__in' => $category_ID,
'orderby' => 'rand',
);
$query = new WP_Query($args);
if( $query -> have_posts() ):
while ($query -> have_posts()) : $query -> the_post(); ?>
<div class="related-post-sub">
<div class="related-post-thumb">
<a href="<?php the_permalink() ?>" title="<?php the_title_attribute(); ?>">
<?php if (has_post_thumbnail()) : ?>
<?php the_post_thumbnail('full'); ?>
<?php else : ?>
<p class="thumb-noimage">no image</p>
<?php endif ; ?>
</a>
</div>
<div class="related-post-content">
<h4><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h4>
</div>
</div>
<?php endwhile;?>
<?php else:?>
<p>関連記事はありませんでした。</p>
<?php endif; wp_reset_postdata(); ?>
</div>
</div>
