The filter passes the anchor tag HTML and the forum_id to your callback. To do this, you’ll have to change your filter, like so:
function remove_bbpress_forum_freshness_date( $anchor, $forum_id) {
}
add_filter('bbp_get_forum_freshness_link', 'remove_bbpress_forum_freshness_date', 10, 2);
So you can see that your filter callback would be passed the anchor and the forum id.
In the bbPress code, it basically just gets the link for the forum, gets the title for the forum, gets the last active time for the forum, and constructs an anchor tag from all this information.
In your filter callback, you can do like is done in the bbPress code:
$forum_id = bbp_get_forum_id( $forum_id );
$active_id = bbp_get_forum_last_active_id( $forum_id );
if ( empty( $active_id ) ) {
$active_id = bbp_get_forum_last_reply_id( $forum_id );
}
if ( empty( $active_id ) ) {
$active_id = bbp_get_forum_last_topic_id( $forum_id );
}
if (bbp_is_topic( $active_id ) ) {
$link_url = bbp_get_forum_last_topic_permalink( $forum_id );
} elseif ( bbp_is_reply( $active_id ) ) {
$link_url = bbp_get_forum_last_reply_url( $forum_id );
}
As you can see, this code gets the ID of the last active item in the forum, be it topic or reply. It checks to see if the last active item was a topic or reply, and gets the appropriate url using the appropriate function.
With the url, you can then construct an anchor tag, and the link would say “View Post” (or “View Topic” if you want to get specific). Then you would return that from the filter callback.
For topics, it’s much easier since the last active will only be replies. The way you set up the filter and callback will be the same, just replacing forum with topic. To get the url, for View Post, do this:
$link_url = bbp_get_topic_last_reply_url( $topic_id );
In the code, it checks this to see if there have been any replies:
$time_since = bbp_get_topic_last_active_time( $topic_id );
if ( empty( $time_since ) ) {
// there are no replies, you can return "No Replies"
} else {
// make anchor tag linking to "View Post"
}
I hope this clears things up a bit for you to try it yourself.
