[wp-hackers] Get All Users with Specific capability

Ryan Bilesky rbilesky at gmail.com
Wed Feb 16 00:55:13 UTC 2011

I was also thinking I might need to have a hook that will fire when roles
and capabilities are changed, is there such a hook in the roles class that
gets fired?

On Tue, Feb 15, 2011 at 4:48 PM, Jeremy Clarke <jer at simianuprising.com>wrote:

> In 3.1 you can use get_users('role=subscriber') to avoid using any custom
> SQL but like you say that is not usually good enough and capabilities are
> fundamentally more useful and important in WP (especially in public plugins
> where you can't make any assumptions about roles).
> IMHO get_users() should be able to take in a capability as well as roles,
> too bad that wasn't included in 3.1. It's certainly a complicated problem,
> but it doesn't seem impossible, just potentially irresponsible WRT server
> performance (you'd want to cache it if you use it on most pageloads).
> On Tue, Feb 15, 2011 at 6:59 PM, Ryan Bilesky <rbilesky at gmail.com> wrote:
> > Ok so basically there isn't a better way.  Now I can make this easier by
> > caching the resulting array in say a site option, then most the time all
> I
> > have to do is pull a site option.  Then I just need to find the necessary
> > hooks pto update the data when it has or may have changed.  So I need to
> > find hooks for when role/capabilities are changed and a hook when a user
> > changes roles.  Does anyone know of any such hooks, am I missing any
> otherd
> > id need?
> >
> >
> Here's the actions I attach my own user caching system to:
> function gv_hook_user_udpate($user_id, $old_user_data = '') {
>     gv_update_cached_user($user_id);
> }
> add_action('profile_update', 'gv_hook_user_udpate', '', 2);
> add_action('user_register', 'gv_hook_user_udpate', '', 1);
> That seems to cover most scenarios, though there could easily be edge cases
> that aren't covered, especially because often cap/role related changes are
> made using plugins that probably don't call profile_update after changing a
> user. Having this data reload at regular intervals is going to be
> important.
> I'd recommend using the Transients API instead of options, as it will
> handle
> expiration for you: https://codex.wordpress.org/Transients_API
> --
> Jeremy Clarke • jeremyclarke.org
> Code and Design • globalvoicesonline.org
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