WordPress Hook After Options Page Save

If you want to hook into WordPress when an options page is saved and access the values that were entered, you can use update_option_{$option}.

Let’s say for my options page, I added the setting like this:

register_setting( km_my_cool_options, km_my_cool_options );

I could then hook into when the options page is saved and access the old & new values like this:

/**
 * Hook into options page after save.
 */
public function km_hook_into_options_page_after_save( $old_value, $new_value ) {
	if ( $old_value['some_option'] != $new_value['some_option'] ) {
		// This value has been changed. Insert code here.
	}

}
add_action( 'update_option_km_my_cool_options', 'km_hook_into_options_page_after_save', 10, 2 );