Related posts code snippets not working, how to fix?

I use elementor and hello theme, i am using child theme and i put the code from this page into the main theme single php file, but it doesnt show the related posts, i tried other versions from different sites but none work

I enabled the main theme but it still would not show

[https://beginnersbook.com/2013/09/display-related-posts-thumbnails-wordpress-plugin/](https://beginnersbook.com/2013/09/display-related-posts-thumbnails-wordpress-plugin/)

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Why didnt it work?

Thanks

Tried these sites as well

[https://www.wpbeginner.com/wp-themes/how-to-add-related-posts-with-a-thumbnail-without-using-plugins/](https://www.wpbeginner.com/wp-themes/how-to-add-related-posts-with-a-thumbnail-without-using-plugins/)

[https://alienwp.com/related-posts-wordpress/](https://alienwp.com/related-posts-wordpress/)

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<?php $orig_post = $post;
global $post;
$categories = get_the_category($post->ID);
if ($categories) {
$category_ids = array();
foreach($categories as $individual_category) $category_ids[] = $individual_category->term_id;
$args=array(
‘category__in’ => $category_ids,
‘post__not_in’ => array($post->ID),
‘posts_per_page’=> 5, // Number of related posts that will be displayed.
‘caller_get_posts’=>1,
‘orderby’=>’rand’ // Randomize the posts
);
$my_query = new wp_query( $args );
if( $my_query->have_posts() ) {
echo ‘<div id=”related_posts” class=”clear”><h3>Related Posts</h3><ul>’;
while( $my_query->have_posts() ) {
$my_query->the_post(); ?>
<li>
<a href=”<?php the_permalink()?>” rel=”bookmark” title=”<?php the_title(); ?>”>
<?php the_post_thumbnail( ‘related-posts’ ); ?>
</a>
<div class=”related_content”>
<a href=”<? the_permalink()?>” rel=”bookmark” title=”<?php the_title(); ?>”><?php the_title(); ?></a>
</div>
</li>
<? }
echo ‘</ul></div>’;
} }
$post = $orig_post;
wp_reset_query(); ?>

 

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