BP_Admin_Tab::settings_save()

	public function settings_save() {
		global $wp_settings_fields;

		$fields = isset( $wp_settings_fields[ $this->tab_name ] )? (array) $wp_settings_fields[ $this->tab_name ] : [];

		foreach( $fields as $section => $settings ) {
			foreach( $settings as $setting_name => $setting ) {
				$value = isset( $_POST[$setting_name] ) ? $_POST[$setting_name] : '';
				bp_update_option( $setting_name, $value );
			}
		}
	}