如果您检查“publish\\u post”操作的函数。

function bp_post_published_notification( $post_id, $post ) {
    $author_id = $post->post_author; /* Post author ID. */
    if ( bp_is_active( \'notifications\' ) ) {
        bp_notifications_add_notification( array(
            \'user_id\'           => $author_id,
            \'item_id\'           => $post_id,
            \'component_name\'    => \'custom\',
            \'component_action\'  => \'custom_action\',
            \'date_notified\'     => bp_core_current_time(),
            \'is_new\'            => 1,
        ) );
    }
}
add_action( \'publish_post\', \'bp_post_published_notification\', 99, 2 );

请注意，您只向Post Author发送通知。您需要将“bp\\u notifications\\u add\\u notification”函数中的“user\\u id”参数更改为所需的用户id。

这是Codex Documentation 对于bp_notifications_add_notification 作用

<小时>EDIT :

更新函数如下：

function bp_post_published_notification( $post_id, $post ) {
    // $author_id = $post->post_author; 

    $active_users = bp_core_get_users( array("per_page"=>-1));

    foreach ( $active_users[\'users\'] as $user ) {
        if ( bp_is_active( \'notifications\' ) ) {
            bp_notifications_add_notification( array(
                \'user_id\'           => $user->ID,
                \'item_id\'           => $post_id,
                \'component_name\'    => \'custom\',
                \'component_action\'  => \'custom_action\',
                \'date_notified\'     => bp_core_current_time(),
                \'is_new\'            => 1,
            ) );
        }
    }
}
add_action( \'publish_post\', \'bp_post_published_notification\', 99, 2 );

Click here 有关的更多详细信息\'bp_core_get_users\' 作用