Using custom taxonomies with wp_get_archives() - php

Question

I am using the following code to get a yearly archive of my posts with a post type of 'foi'.
Here is my code:
wp_get_archives(
array(
'post_type' => 'foi',
'type' => 'yearly',
'limit' => '10',
'show_post_count' => 'true'
)
);
I have a taxonomy set-up for the post type foi and I would like to use that in the wp_get_archives() function somehow. An example would be to show the yearly archive for all posts with a post type of foi but also with a taxonomy of document.
How can this be achieved?

Answer 1

You get it using filter like below:
In templates/custom-archive-template.php
add_filter( 'getarchives_where', 'custom_archive_by_category_where' );
add_filter( 'getarchives_join', 'custom_archive_by_category_join' );
$args = array();
wp_get_archives(
array(
'type' => 'yearly',
'format' => 'option',
'post_type' => 'news',
)
);
remove_filter( 'getarchives_where', 'custom_archive_by_category_where' );
remove_filter( 'getarchives_join', 'custom_archive_by_category_join' );
In functions.php:
function custom_archive_by_category_join( $x ) {
global $wpdb;
return $x . " INNER JOIN $wpdb->term_relationships ON ($wpdb->posts.ID = $wpdb->term_relationships.object_id) INNER JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id)";
}
function custom_archive_by_category_where($x) {
global $wpdb;
$current_term_slug = get_query_var( 'news_category' );
if (!empty($current_term_slug)) {
$current_term = get_term_by('slug', $current_term_slug, 'news_category');
if (is_wp_error($current_term) ) {
return $x;
}
$current_term_id = $current_term->term_id;
return $x . " AND $wpdb->term_taxonomy.taxonomy = 'news_category' AND $wpdb->term_taxonomy.term_id IN ($current_term_id)";
}
return $x;
}
Please change news_category to your desire category slug.
Originally posted on: https://developer.wordpress.org/reference/functions/wp_get_archives/#div-comment-3182