How to add @mention username under bbPress user avatars in WordPress

To add a @mention username under bbPress user avatars using the functions.php file, you can use the bbp_theme_after_user_avatar action hook. This hook allows you to add content after the user avatar on bbPress pages.

Here is an example of how you can use this hook to add a @mention username under bbPress user avatars:

// Add @mention username under bbPress user avatars in WordPress
// More snippets at wpunplugged.com 

function add_mention_username_under_avatar() {
    $user_id = bbp_get_user_id();
    $user_login = bbp_get_user_login( $user_id );
    echo '<div class="mention-username">@' . esc_html( $user_login ) . '</div>';
}
add_action( 'bbp_theme_after_user_avatar', 'add_mention_username_under_avatar' );

In this example, we are using the bbp_get_user_id() and bbp_get_user_login() functions to get the user ID and login name of the user whose avatar is being displayed. We then use the esc_html() function to escape the login name and add it to the page as a @mention username.

It’s important to note that this code will add the @mention username under the user avatar on all bbPress pages. If you only want to add the @mention username in certain contexts, you will need to add additional checks before displaying the username.