update*
it still doesn’t work thou
<?php
$scat = get_the_term_list( $id_product,”scat”); // I add this ‘scat’ through the product page in Admin Panel by using Custom Taxonomy. It will be the ID of the wordpress category */
// query
$query = new WP_Query( array( ‘cat’ => $scat ) );
?>
<?php if( $the_query->have_posts() ): ?>
<?php while( $the_query->have_posts() ) : $the_query->the_post(); ?>
$content = apply_filters(‘the_content’, $post->post_content);
<?php add_post_meta($post_id, ‘chapter’, $content); ?>
<?php endwhile; ?>
<?php endif; ?>
<?php wp_reset_query(); ?>
