Get post tags for multiple posts

In case anyone ever comes across this problem, I found the function in taxonomy.php.

I was selecting specific categories from the database then looping through them. $term->term_id is the ID of the current category in the loop.

// Select all the posts in that category
$posts		=	get_posts(array('category' => $term->term_id));
$post_ids	=	array();

// iterate through the array returned by get_posts, and add the ids to its own array
foreach($posts AS $post) {
	$post_ids[]	=	$post->ID;
}

// pass the array of post ids to wp_get_object_terms, from taxonomy.php. Also specify that it should return post_tags.
$tags		=	wp_get_object_terms($ids, 'post_tag');
$tags_names	=       array();

// iterate through the tags returned by wp_get_object_terms
// there are other fields available, I just only needed the name
foreach($tags AS $tag) {
	$tag_names[]	=	$tag->name;
}

// create a comma delimited list of tag names
$tags		=	implode(', ', $tag_names);