staylor / WordPress

 *               'all_with_object_id', an array of WP_Term objects will be returned. If `$fields`

 *               is 'ids', an array of category ids. If `$fields` is 'names', an array of category names.

 */

function wp_get_post_categories( $post_id = 0, $args = array() ) {

	$post_id = (int) $post_id;

	$defaults = array('fields' => 'ids');

	$args = wp_parse_args( $args, $defaults );

	$cats = wp_get_object_terms($post_id, 'category', $args);

	return $cats;

}

/**

 * Retrieve the tags for a post.

 * @return array|WP_Error  List of post terms or empty array if no terms were found. WP_Error object

 *                         if `$taxonomy` doesn't exist.

 */

function wp_get_post_terms( $post_id = 0, $taxonomy = 'post_tag', $args = array() ) {

	$post_id = (int) $post_id;

	$defaults = array('fields' => 'all');

	$args = wp_parse_args( $args, $defaults );

	$tags = wp_get_object_terms($post_id, $taxonomy, $args);

	return $tags;

}

/**

 * Retrieve a number of recent posts.