Função para copiar as categorias associadas aos posts de um tipo customizado para uma nova taxonomia customizada

copy-custom-post-type-categories.php

<?php
/**
 * Function to copy categories associated with custom post type to the new custom taxonomy "taxonomy-slug".
 */
function copy_custom_post_type_categories() {
    // Set arguments to retrieve custom post type posts.
    $args = array(
        'post_type'      => 'post-type-slug', // Replace 'post-type-slug' with your custom post type name.
        'posts_per_page' => -1,
    );

    // Retrieve custom post type posts.
    $custom_posts = new WP_Query($args);

    // Check if there are custom post type posts.
    if ($custom_posts->have_posts()) {
        // Loop through custom post type posts.
        while ($custom_posts->have_posts()) {
            $custom_posts->the_post();

            // Get all categories associated with the post.
            $post_categories = get_the_category();

            // Check if the post has associated categories.
            if ($post_categories) {
                // Loop through the categories associated with the post.
                foreach ($post_categories as $category) {
                    // Check if the category already exists in the new taxonomy.
                    $existing_term = term_exists($category->name, 'taxonomy-slug');

                    // If the term does not exist in the new taxonomy, create it.
                    if ($existing_term === 0 || $existing_term === null) {
                        $args = array(
                            'description' => $category->description,
                            'slug'        => $category->slug,
                        );
                        $existing_term = wp_insert_term($category->name, 'taxonomy-slug', $args);

                        // Check if there was an error inserting the term.
                        if (is_wp_error($existing_term)) {
                            error_log('Error inserting term ' . $category->name . ' in the new taxonomy: ' . $existing_term->get_error_message());
                            continue; // Skip to the next iteration of the loop in case of an error.
                        }
                    }

                    // Check if the category has a parent in the default taxonomy.
                    if ($category->parent != 0) {
                        // Get the corresponding parent term in the new taxonomy.
                        $parent_term_exists = term_exists(get_cat_name($category->parent), 'taxonomy-slug');

                        // If the parent term does not exist, create it.
                        if ($parent_term_exists === 0 || $parent_term_exists === null) {
                            $parent_args = array(
                                'description' => get_category($category->parent)->description,
                                'slug'        => get_category($category->parent)->slug,
                            );
                            $parent_term_exists = wp_insert_term(get_cat_name($category->parent), 'taxonomy-slug', $parent_args);

                            // Check if there was an error inserting the parent term.
                            if (is_wp_error($parent_term_exists)) {
                                error_log('Error inserting parent term ' . get_cat_name($category->parent) . ' in the new taxonomy: ' . $parent_term_exists->get_error_message());
                                continue; // Skip to the next iteration of the loop in case of an error.
                            }
                        }

                        // Assign the parent term to the category term in the new taxonomy.
                        wp_update_term($existing_term['term_id'], 'taxonomy-slug', array('parent' => $parent_term_exists['term_id']));
                    }

                    // Assign the new taxonomy term to the post.
                    wp_set_post_terms(get_the_ID(), $existing_term['term_id'], 'taxonomy-slug', true);
                }
            }
        }
        wp_reset_postdata(); // Restore post data.
    }
}
add_action('init', 'copy_custom_post_type_categories', 999);