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<?php
namespace Yoast\WP\SEO\Integrations;
use stdClass;
use WP_Error;
use WP_Post;
use WPSEO_Primary_Term;
use Yoast\WP\SEO\Conditionals\Primary_Category_Conditional;
/**
* Adds customizations to the front end for the primary category.
*/
class Primary_Category implements Integration_Interface {
/**
* Returns the conditionals based on which this loadable should be active.
*
* In this case only when on the frontend, the post overview, post edit or new post admin page.
*
* @return array The conditionals.
*/
public static function get_conditionals() {
return [ Primary_Category_Conditional::class ];
}
/**
* Registers a filter to change a post's primary category.
*
* @return void
*/
public function register_hooks() {
\add_filter( 'post_link_category', [ $this, 'post_link_category' ], 10, 3 );
}
/**
* Filters post_link_category to change the category to the chosen category by the user.
*
* @param stdClass $category The category that is now used for the post link.
* @param array $categories This parameter is not used.
* @param WP_Post $post The post in question.
*
* @return array|null|object|WP_Error The category we want to use for the post link.
*/
public function post_link_category( $category, $categories = null, $post = null ) {
$post = \get_post( $post );
if ( $post === null ) {
return $category;
}
$primary_category = $this->get_primary_category( $post );
if ( $primary_category !== false && $primary_category !== $category->cat_ID ) {
$category = \get_category( $primary_category );
}
return $category;
}
/**
* Get the id of the primary category.
*
* @codeCoverageIgnore It justs wraps a dependency.
*
* @param WP_Post $post The post in question.
*
* @return int Primary category id.
*/
protected function get_primary_category( $post ) {
$primary_term = new WPSEO_Primary_Term( 'category', $post->ID );
return $primary_term->get_primary_term();
}
}
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