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I am trying to fetch 1st category for each blog post that appears in the sidebar of any blogpost landing page.

I tried multiple options to add the 2nd block code to the 1st block at the line ".wp_get_post_categories ($post_id)." but I could not find any solution.

Please help me with that and if you need closer to the code just let me know.

1st Block

$related_blog .="<div class='related-blog'>
                            <div class='row'>
                                <a href=".get_the_permalink().">
                            
                                    <div class='col-lg-4 col-md-4 col-xs-4 blog-image'>
                                        <img src=".$image_related[0].">
                                    </div>

                                    <div class='col-lg-8 col-md-8 col-xs-8 blog-text'>
                                        <strong><p class='related-blog-title'>".get_the_title()."</p></strong>
                                </a>
                                <span class='related-blog-sidebar-content '>".substr(get_the_content(),0,250)."...</span>
                                
                                <p class='related-blog-sidebar-category'>
                                ".wp_get_post_categories ($post_id)."                               
                                </p>
                                
                                <a class='related-blog-sidebar-link' href=".get_the_permalink().">Read More
                                </a>

                                    </div>
                            </div>
                        </div>";

2nd Block

<?php $category = get_the_category(); ?>
<a  href="<?php echo get_category_link($category[0]->cat_ID); ?> ">
<?php echo $category[0]->cat_name; ?> </a>

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