Yoast SEO - Altering Yoast SEO primary terms

Yoast SEO allows you to set categories as a primary term for posts and pages. In some cases, you might want to allow your users to use additional, custom taxonomies to be used as a primary term. The wpseo_primary_term_taxonomies filter allows you to alter what taxonomies are available to be assigned as a primary term.

Usage

Adding taxonomies

The example below shows how you can use the filter to add a taxonomy to the list of potential primary terms.

<?php
/**
* Adds the custom category to be selectable as a primary term.
*
* @param array $taxonomies The current taxonomies that can be used as a primary term.
* @param string $post_type The current post type.
* @param array $all_taxonomies All registered taxonomies.
*
* @return mixed The taxonomies that can be used as primary terms.
*/
function add_additional_primary_term_taxonomies( $taxonomies, $post_type, $all_taxonomies ) {
if ( $post_type === 'my_custom_post_type' && isset( $all_taxonomies['my_custom_category'] ) ) {
$taxonomies['my_custom_category'] = $all_taxonomies['my_custom_category'];
}
return $taxonomies;
}
add_filter( 'wpseo_primary_term_taxonomies', 'add_additional_primary_term_taxonomies', 10, 3 );

Removing taxonomies

The example below shows how you can use the filter to remove a particular taxonomy from being selected as a primary term.

<?php
/**
* Removes a custom category to be selectable as a primary term.
*
* @param array $taxonomies The current taxonomies that can be used as a primary term.
* @param string $post_type The current post type.
* @param array $all_taxonomies All registered taxonomies.
*
* @return mixed The taxonomies that can be used as primary terms.
*/
function remove_primary_term_taxonomies( $taxonomies, $post_type, $all_taxonomies ) {
if ( isset( $taxonomies['my_custom_category'] ) ) {
unset( $taxonomies['my_custom_category'] );
}
return $taxonomies;
}
add_filter( 'wpseo_primary_term_taxonomies', 'remove_primary_term_taxonomies', 11, 3 );