Add a hook after updating the settings page option

[dominykasgel]

I couldn't find a proper way how to hook into WP after updating/saving the settings page option. For example: I have a custom settings page built with register_setting() function and I want to call a custom function once the settings page option has been updated, but there's no action. I think it would be very useful to have this hook.

In my patch, the 'settings_updated' action is triggered right after the settings page option has been updated.

[dominykasgel]

Thisi is a patch for options.php. Includes a hook after saving the settings page option.

[dominykasgel]

Achieved this with

update_option_{$option}
updated_option