Related Products Tag Fiters

Hi,
Thank you for your immediate response.

I need to modify the related.php file.
I am creating a new function get_related function (found in the /classes/abstracts/abstract-wc-product.php file of the WooCommerce plugin directory) with the following code:

//New "Related Products" function for WooCommerce
function get_related_custom( $id, $limit = 5 ) {
    global $woocommerce;
    // Related products are found from category and tag
    $tags_array = array(0);
    $cats_array = array(0);
    // Get tags
    $terms = wp_get_post_terms($id, 'product_tag');
    foreach ( $terms as $term ) $tags_array[] = $term->term_id;
    // Get categories (removed by NerdyMind)
/*
    $terms = wp_get_post_terms($id, 'product_cat');
    foreach ( $terms as $term ) $cats_array[] = $term->term_id;
*/
    // Don't bother if none are set
    if ( sizeof($cats_array)==1 && sizeof($tags_array)==1 ) return array();
    // Meta query
    $meta_query = array();
    $meta_query[] = $woocommerce->query->visibility_meta_query();
    $meta_query[] = $woocommerce->query->stock_status_meta_query();
    // Get the posts
    $related_posts = get_posts( apply_filters('woocommerce_product_related_posts', array(
        'orderby'        => 'rand',
        'posts_per_page' => $limit,
        'post_type'      => 'product',
        'fields'         => 'ids',
        'meta_query'     => $meta_query,
        'tax_query'      => array(
            'relation'      => 'OR',
            array(
                'taxonomy'     => 'product_cat',
                'field'        => 'id',
                'terms'        => $cats_array
            ),
            array(
                'taxonomy'     => 'product_tag',
                'field'        => 'id',
                'terms'        => $tags_array
            )
        )
    ) ) );
    $related_posts = array_diff( $related_posts, array( $id ));
    return $related_posts;
}
add_action('init','get_related_custom');

Then I need to go to related.php file (/themes/basel/woocommerce/single-product/related.php)
and add the following line of code:
$related = get_related_custom($product->id);

The code in your related.php file is the following:

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

if ( $related_products ) : ?>

	<section class="related products">
		<?php 

			$slider_args = array(
				'slides_per_view' => apply_filters( 'basel_related_products_per_view', 4 ),
				'title' => esc_html__( 'Related products', 'woocommerce' ),
				'img_size' => 'shop_catalog'
			);

			echo basel_generate_posts_slider( $slider_args, false, $related_products );
			
		?>

	</section>

<?php endif;

wp_reset_postdata();

When I add the line of code mentioned above, the website crashes.

Any advices?

Thank you in advance.