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Edit File: primary-term-helper.php

<?php

namespace Yoast\WP\SEO\Helpers;

use stdClass;

/**
 * A helper object for primary terms.
 */
class Primary_Term_Helper {

/**
	 * Generate the primary term taxonomies.
	 *
	 * @param int $post_id ID of the post.
	 *
	 * @return array The taxonomies.
	 */
	public function get_primary_term_taxonomies( $post_id ) {
		$post_type      = \get_post_type( $post_id );
		$all_taxonomies = \get_object_taxonomies( $post_type, 'objects' );
		$all_taxonomies = \array_filter( $all_taxonomies, [ $this, 'filter_hierarchical_taxonomies' ] );

/**
		 * Filters which taxonomies for which the user can choose the primary term.
		 *
		 * @param array  $taxonomies     An array of taxonomy objects that are primary_term enabled.
		 * @param string $post_type      The post type for which to filter the taxonomies.
		 * @param array  $all_taxonomies All taxonomies for this post types, even ones that don't have primary term
		 *                               enabled.
		 */
		$taxonomies = (array) \apply_filters( 'wpseo_primary_term_taxonomies', $all_taxonomies, $post_type, $all_taxonomies );

return $taxonomies;
	}

/**
	 * Returns whether or not a taxonomy is hierarchical.
	 *
	 * @param stdClass $taxonomy Taxonomy object.
	 *
	 * @return bool True for hierarchical taxonomy.
	 */
	protected function filter_hierarchical_taxonomies( $taxonomy ) {
		return (bool) $taxonomy->hierarchical;
	}
}

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