Inventory_Presser_Admin_Options::callback_sort_vehicles_by()

	public function callback_sort_vehicles_by() {
		// use these default values if we have none
		if ( ! isset( $this->option['sort_vehicles_by'] ) ) {
			$this->option['sort_vehicles_by'] = 'make';
		}
		if ( ! isset( $this->option['sort_vehicles_order'] ) ) {
			$this->option['sort_vehicles_order'] = 'ASC';
		}

		add_filter( 'invp_html_select_vehicle_keys_value', array( $this, 'change_sort_by_option_values' ) );

		$select = $this->html_select_vehicle_keys(
			array(
				'name' => INVP::OPTION_NAME . '[sort_vehicles_by]',
				'id'   => 'sort_vehicles_by',
			),
			$this->option['sort_vehicles_by']
		);

		remove_filter( 'invp_html_select_vehicle_keys_value', array( $this, 'change_sort_by_option_values' ) );

		printf(
			'%s %s <select name="%s[sort_vehicles_order]" id="sort_vehicles_order">',
			$select,
			esc_html__( 'in', 'inventory-presser' ),
			esc_attr( INVP::OPTION_NAME )
		);

		foreach ( array(
			'ascending'  => 'ASC',
			'descending' => 'DESC',
		) as $direction => $abbr ) {
			echo '<option value="' . esc_attr( $abbr ) . '"';
			if ( isset( $this->option['sort_vehicles_order'] ) ) {
				selected( $this->option['sort_vehicles_order'], $abbr );
			}
			echo '>' . esc_html( $direction ) . '</option>';
		}
		echo '</select> ' . esc_html__( 'order', 'inventory-presser' );
	}