Jamie Thingelstad

/**
 * Custom code added to P2 to enable email notifications
 * when a user is @mentioned in the site.
 *
 * Original at [trepmal.com/2011/06/2...](http://trepmal.com/2011/06/24/using-wordpress-multisite-p2-and-more/)
 * and modified from there.
 */
add_action('publish_post','send_email_notification_once',9);
function send_email_notification_once($postID) {
    $post = get_post($postID);
    $author = get_userdata($post->post_author);
    global $p2;
    $mentions = $p2->components['mentions']->find_mentions($post->post_content);
    $permalink = get_permalink($postID);
    $blog_title = get_bloginfo('name');
    foreach ( $mentions as $match ) {
        $email = get_user_by('slug',$match)->user_email;
        $message = "You have been mentioned in this post:\n $permalink 

 {$post->post_content} ";
        wp_mail($email, "[$blog_title] You've been mentioned by {$author->display_name}", $message);
    }
}

add_action('comment_post','send_email_notification_once_comment',9);
function send_email_notification_once_comment($commentID){
    $comment = get_comment($commentID);
    global $p2;
    $mentions = $p2->components['mentions']->find_mentions($comment->comment_content);
    $permalink = get_permalink($comment->comment_post_ID);
    $blog_title = get_bloginfo('name');
    foreach ( $mentions as $match ) {
        $email = get_user_by('slug',$match)->user_email;
        $message = "You have been mentioned by {$comment->comment_author} in this comment:\n $permalink 

 {$comment->comment_content} ";
        wp_mail($email, "[$blog_title] You've been mentioned in a comment by {$comment->comment_author}", $message);
    }
}