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<?php

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namespace Yoast\WP\SEO\Helpers;

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use stdClass;

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/**

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* A helper object for primary terms.

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class Primary_Term_Helper {

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/**

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* Generate the primary term taxonomies.

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* @param int $post_id ID of the post.

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* @return array The taxonomies.

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public function get_primary_term_taxonomies( $post_id ) {

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$post_type = \get_post_type( $post_id );

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$all_taxonomies = \get_object_taxonomies( $post_type, 'objects' );

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$all_taxonomies = \array_filter( $all_taxonomies, [ $this, 'filter_hierarchical_taxonomies' ] );

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/**

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* Filters which taxonomies for which the user can choose the primary term.

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* @param array $taxonomies An array of taxonomy objects that are primary_term enabled.

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* @param string $post_type The post type for which to filter the taxonomies.

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* @param array $all_taxonomies All taxonomies for this post types, even ones that don't have primary term

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* enabled.

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$taxonomies = (array) \apply_filters( 'wpseo_primary_term_taxonomies', $all_taxonomies, $post_type, $all_taxonomies );

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return $taxonomies;

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}

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/**

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* Returns whether or not a taxonomy is hierarchical.

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* @param stdClass $taxonomy Taxonomy object.

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* @return bool True for hierarchical taxonomy.

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protected function filter_hierarchical_taxonomies( $taxonomy ) {

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return (bool) $taxonomy->hierarchical;

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}

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}

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