get_the_category( int $post_id = false ): WP_Term[]

77function get_the_category( $post_id = false ) {78	$categories = get_the_terms( $post_id, 'category' );79	if ( ! $categories || is_wp_error( $categories ) ) {80		$categories = array();81	}82 83	$categories = array_values( $categories );84 85	foreach ( array_keys( $categories ) as $key ) {86		_make_cat_compat( $categories[ $key ] );87	}88 89	/**90	 * Filters the array of categories to return for a post.91	 *92	 * @since 3.1.093	 * @since 4.4.0 Added the `$post_id` parameter.94	 *95	 * @param WP_Term[] $categories An array of categories to return for the post.96	 * @param int|false $post_id    The post ID.97	 */98	return apply_filters( 'get_the_categories', $categories, $post_id );99}