What is the real purpose of the parameter $option_group in the function register_setting()?
The $option_group parameter of register_setting should match the $option_group parameter of settings_fields, which is typically used as part of creating a custom settings page. When you use register settings with register_setting(), your registered settings are added to a global variable of allowed options, where they are grouped by the $option_group parameter. When you submit your … Read more