hooks
		 * 3 = .htaccess
		 */
		$old_value = $old_value > 0;
		$value     = $value > 0;

		if ( $old_value !== $value ) {
			$this->trigger_webp_change();
		}
	}

	/**
	 * Store the ShortPixel option value before it is deleted.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 *
	 * @param string $option Name of the option to delete.
	 */
	public function store_option_value_before_delete( $option ) {
		if ( $this->plugin_option_name_to_serve_webp === $option ) {
			$this->tmp_is_serving_webp = $this->is_serving_webp();
		}
	}

	/**
	 * Maybe activate webp cache after ShortPixel option has been deleted.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 */
	public function sync_on_option_delete() {
		if ( false !== $this->tmp_is_serving_webp ) {
			$this->trigger_webp_change();
		}
	}

	/** ----------------------------------------------------------------------------------------- */
	/** PUBLIC TOOLS ============================================================================ */
	/** ----------------------------------------------------------------------------------------- */

	/**
	 * Get the plugin name.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 *
	 * @return string
	 */
	public function get_name() {
		return 'ShortPixel';
	}

	/**
	 * Get the plugin identifier.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 *
	 * @return string
	 */
	public function get_id() {
		return 'shortpixel';
	}

	/**
	 * Tell if the plugin converts images to webp.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 *
	 * @return bool
	 */
	public function is_converting_to_webp() {
		return (bool) get_option( 'wp-short-create-webp' );
	}

	/**
	 * Tell if the plugin serves webp images on frontend.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 *
	 * @return bool
	 */
	public function is_serving_webp() {
		return (bool) get_option( $this->plugin_option_name_to_serve_webp );
	}

	/**
	 * Tell if the plugin uses a CDN-compatible technique to serve webp images on frontend.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 *
	 * @return bool
	 */
	public function is_serving_webp_compatible_with_cdn() {
		$display = (int) get_option( $this->plugin_option_name_to_serve_webp );

		if ( ! $display ) {
			// The option is not enabled, no webp.
			return false;
		}

		if ( 3 === $display ) {
			// The option is set to "rewrite rules".
			return false;
		}

		return true;
	}

	/**
	 * Get the plugin basename.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 *
	 * @return bool
	 */
	public function get_basename() {
		if ( empty( $this->plugin_basename ) ) {
			$this->plugin_basename = defined( 'SHORTPIXEL_PLUGIN_FILE' ) ? plugin_basename( SHORTPIXEL_PLUGIN_FILE ) : 'shortpixel-image-optimiser/wp-shortpixel.php';
		}

		return $this->plugin_basename;
	}
}