[wp-hackers] How to Make Plugin MU-Capable

Jorge Peña jorgepblank at gmail.com
Thu Jun 5 19:48:59 GMT 2008

Thanks! I looked at your Super Cache plugin which is MU friendly supposedly
and I saw this line in the readme.txt:

If you are using WordPress MU you will need to install this in
'wp-content/mu-plugins/wp-super-cache/' and the file wp-cache.php must be
copied into the mu-plugins directory.

Must I do something like this too then? Also in the mu-plugins directory one
cannot put plugin folders like say the entire wp-recaptcha folder? Only PHP
scripts? In that case if I have more files like stylesheets and libraries
then I will need to do what you said in the above line right? Ah I finally
found what I was looking for:

add_submenu_page('wpmu-admin.php', __('WP Super Cache'), __('WP Super
Cache'), 'manage_options', __FILE__, 'wp_cache_manager');
add_options_page('WP Super Cache', 'WP Super Cache', 'manage_options',
__FILE__, 'wp_cache_manager');

That allows me to place the options page under the so called admin settings
or whatever, which was what someone was telling me about, I assume. I guess
is_site_admin is a WPMU only check then.

Thanks for any help you can provide Donncha!

On Thu, Jun 5, 2008 at 3:22 AM, Donncha O Caoimh <donncha at linux.ie> wrote:

> Hi,
> The main difference between WP and MU for plugins is where the plugin
> lives. There is a plugins folder still, but there's also an mu-plugins
> folder too. Any file in mu-plugins will be included/loaded on every request.
> It's likely that your plugin will be dropped in there.
> Also, almost every user on an MU site is untrusted, even admins. The only
> people who should have access to edit css or html in your plugin are site
> admins. You can check if the current user is one by using the
> is_site_admin() function, any time after init.
> Donncha
> Jorge Peña wrote:
>> Hello, I'm the developer for a plugin (wp-recaptcha) and it has been my
>> intention (Due to many requests) to make it MU-capable, the only 'problem'
>> is I haven't gotten around to figuring out what it is that this entails.
>> Does MU use actions and filters? The main filters I use are:
>> wp_head - CSS for the reCAPTCHA related things on the blog such as hidden
>> emails (filter)
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