Display Single Post Related Posts by Category in sidebar

<?php <span class="catagoryHeading">এই বিভাগের আরও খবর</span>


<ul class="catagory">

<?php

$related = get_posts( array( 'category__in' => wp_get_post_categories($post->ID), 'numberposts' => 7, 'post__not_in' => array($post->ID) ) );
if( $related ) foreach( $related as $post ) {
setup_postdata($post); ?>

        <li>
        <a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a>
        </li>
<?php }
wp_reset_postdata(); ?> </ul>

?>