Hiển thị bài viết liên quan theme GeneratePress không dùng plugin

//BÀI VIẾT LIÊN QUAN GENRATEPRESS BY HOCBAN.VN
add_action( 'generate_before_comments_container', 'gp_related_posts_php84_optimized' );
function gp_related_posts_php84_optimized(): void {
if ( ! is_single() || ! in_the_loop() || ! is_main_query() ) {
return;
}

global $post;
if ( ! $post instanceof WP_Post ) {
return;
}

$current_id = $post->ID;

$cache_key = 'gp_rel_ids_' . $current_id;
$top4_ids = wp_cache_get( $cache_key, 'gp_related' );

if ( false === $top4_ids ) {
$current_cats = wp_get_post_categories( $current_id, [ 'fields' => 'ids' ] );
$current_tags = wp_get_post_tags( $current_id, [ 'fields' => 'ids' ] );

if ( empty( $current_cats ) && empty( $current_tags ) ) {
return;
}

$related = new WP_Query( [
'post__not_in' => [ $current_id ],
'posts_per_page' => 30,
'post_status' => 'publish',
'ignore_sticky_posts' => true,
'no_found_rows' => true,
'update_post_meta_cache' => false,
'fields' => 'ids',
'tax_query' => [
'relation' => 'OR',
[ 'taxonomy' => 'category', 'field' => 'term_id', 'terms' => $current_cats ],
[ 'taxonomy' => 'post_tag', 'field' => 'term_id', 'terms' => $current_tags ],
],
] );

if ( ! $related->have_posts() ) {
wp_reset_postdata();
return;
}

$scored_posts = [];

foreach ( $related->posts as $pid ) {
$post_cats = wp_get_post_categories( $pid, [ 'fields' => 'ids' ] ) ?: [];
$post_tags = wp_get_post_tags( $pid, [ 'fields' => 'ids' ] ) ?: [];

$common_cats = array_intersect( $current_cats, $post_cats );
$common_tags = array_intersect( $current_tags, $post_tags );

$score = ( count( $common_cats ) * 100 ) + ( count( $common_tags ) * 10 );

if ( $score > 0 ) {
$scored_posts[] = [ 'id' => $pid, 'score' => $score ];
}
}

wp_reset_postdata();

if ( empty( $scored_posts ) ) {
return;
}

usort( $scored_posts, fn( $a, $b ) => $b['score'] <=> $a['score'] );
$top4_ids = array_slice( array_column( $scored_posts, 'id' ), 0, 4 );
wp_cache_set( $cache_key, $top4_ids, 'gp_related', 6 * HOUR_IN_SECONDS );
}

if ( empty( $top4_ids ) ) {
return;
}

$top_posts = get_posts( [
'post__in' => $top4_ids,
'posts_per_page' => 4,
'post_status' => 'publish',
'orderby' => 'post__in',
'no_found_rows' => true,
'update_post_meta_cache' => false,
] );

if ( empty( $top_posts ) ) {
return;
}

//HIỂN THỊ với SEO Optimization
?>
<aside class="gp-related-posts" aria-labelledby="gp-related-title" itemscope itemtype="https://schema.org/ItemList">
<h3 id="gp-related-title" class="gp-related-title" itemprop="name">Bài viết liên quan</h3>
<ul class="gp-related-list">
<?php 
$position = 1;
foreach ( $top_posts as $p ) : 
setup_postdata( $p );
?>
<li class="gp-related-item" itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem">
<meta itemprop="position" content="<?php echo esc_attr( $position ); ?>">
<a href="<?php echo esc_url( get_permalink( $p ) ); ?>" 
class="gp-related-link" 
itemprop="url"
rel="bookmark">
<span itemprop="name"><?php echo esc_html( get_the_title( $p ) ); ?></span>
</a>
</li>
<?php 
$position++;
endforeach; 
wp_reset_postdata();
?>
</ul>
</aside>
<?php
}

add_action( 'wp_head', 'gp_related_posts_styles' );
function gp_related_posts_styles(): void {
if ( ! is_single() ) {
return;
}
?>
<style id="gp-related-posts-css">
.gp-related-posts {
margin: 50px 0;
padding: 28px 30px;
background: #fdfdfd;
border: 1px solid #e2e8f0;
border-radius: 12px;
box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.gp-related-title {
margin: 0 0 20px 0;
font-size: 1.3em;
font-weight: 600;
color: #f2005d;
text-align: center;
text-transform: uppercase;
letter-spacing: 0.8px;
}

.gp-related-list {
margin: 0;
padding-left: 1.5em;
list-style: square;
}

.gp-related-item {
margin: 0;
padding: 5px 0;
border-bottom: 1px dashed #cbd5e1;
}

.gp-related-item:last-child {
border-bottom: none;
}

.gp-related-link {
color: #1118e3;
text-decoration: none;
font-weight: 500;
font-size: 1.05em;
line-height: 1.4;
transition: color 0.2s ease;
}

.gp-related-link:hover {
color: #e43900;
}

@media (max-width: 768px) {
.gp-related-posts {
margin: 30px 0;
padding: 28px 5px;
border-radius: 0;
box-shadow: none;
}
}
</style>
<?php
}


add_action( 'save_post', 'gp_clear_related_posts_cache_lite', 10, 1 );
function gp_clear_related_posts_cache_lite( int $post_id ): void {
if ( wp_is_post_revision( $post_id ) || wp_is_post_autosave( $post_id ) ) {
return;
}
wp_cache_delete( 'gp_rel_ids_' . $post_id, 'gp_related' );
}