[wp-hackers] Best practices for updating plugin options network-wide

[Otto]

On Thu, Sep 8, 2011 at 8:40 AM, Dino Termini <dino at duechiacchiere.it> wrote:
> I've developed some plugins that have full support for WPMU. As for most
> plugins out there, I have some options to keep track of, so I stored them in
> the "local" options table for each blog in the network (add_option,
> get_option). Now some users are asking me to implement a functionality to
> allow them to change/override the value of some of these options
> network-wide, while keeping the freedom for single blog administrators to
> further customize them. How would you implement this? How about a foreach
> ($blogids as $blog_id) ?

Use add_site_option and get_site_option to store selected options
globally, then merge the local options with the global ones when you
load them.

Assuming you use arrays of options, something like this would work:

$options = wp_parse_args( get_option('my_options',array() ),
get_site_option('my_options',array() ) );

This way, if you have something in the sitewide array, it will be used
as the default unless the local options exists, in which case it
overrides it.

-Otto