wp_set_post_categories( int $post_id = 0, int[]|int $post_categories = array(), bool $append = false ): array|false|WP_Error

5672function wp_set_post_categories( $post_id = 0, $post_categories = array(), $append = false ) {5673	$post_id     = (int) $post_id;5674	$post_type   = get_post_type( $post_id );5675	$post_status = get_post_status( $post_id );5676 5677	// If $post_categories isn't already an array, make it one.5678	$post_categories = (array) $post_categories;5679 5680	if ( empty( $post_categories ) ) {5681		/**5682		 * Filters post types (in addition to 'post') that require a default category.5683		 *5684		 * @since 5.5.05685		 *5686		 * @param string[] $post_types An array of post type names. Default empty array.5687		 */5688		$default_category_post_types = apply_filters( 'default_category_post_types', array() );5689 5690		// Regular posts always require a default category.5691		$default_category_post_types = array_merge( $default_category_post_types, array( 'post' ) );5692 5693		if ( in_array( $post_type, $default_category_post_types, true )5694			&& is_object_in_taxonomy( $post_type, 'category' )5695			&& 'auto-draft' !== $post_status5696		) {5697			$post_categories = array( get_option( 'default_category' ) );5698			$append          = false;5699		} else {5700			$post_categories = array();5701		}5702	} elseif ( 1 === count( $post_categories ) && '' === reset( $post_categories ) ) {5703		return true;5704	}5705 5706	return wp_set_post_terms( $post_id, $post_categories, 'category', $append );5707}