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		$cdn_urls = $this->options->get( 'cdn_cnames', [] );

		if ( ! $cdn_urls ) {
			return $hosts;
		}

		// Separate image hosts from the other ones.
		$image_hosts = [];
		$other_hosts = [];
		$cdn_zones   = $this->options->get( 'cdn_zone', [] );

		foreach ( $cdn_urls as $k => $urls ) {
			if ( ! in_array( $cdn_zones[ $k ], $zones, true ) ) {
				continue;
			}

			$urls = explode( ',', $urls );
			$urls = array_map( 'trim', $urls );

			if ( 'images' === $cdn_zones[ $k ] ) {
				foreach ( $urls as $url ) {
					$image_hosts[] = $url;
				}
			} else {
				foreach ( $urls as $url ) {
					$other_hosts[] = $url;
				}
			}
		}

		// Make sure the image hosts are not also used for other things (duplicate).
		$image_hosts = array_diff( $image_hosts, $other_hosts );

		// Then remove the remaining from the final list.
		return array_diff( $hosts, $image_hosts );
	}

	/**
	 * Maybe remove the images option from the CDN dropdown.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 *
	 * @param  bool $allow true to add the option, false otherwise.
	 * @return bool
	 */
	public function maybe_remove_images_from_cdn_dropdown( $allow ) {
		if ( ! $allow ) {
			return $allow;
		}
		if ( ! ewww_image_optimizer_get_option( 'ewww_image_optimizer_exactdn' ) ) {
			return $allow;
		}

		// EWWW uses ExactDN: WPR CDN should be disabled for images.
		return false;
	}

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

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

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

	/**
	 * Tell if the plugin converts images to webp.
	 *
	 * @since  3.4
	 * @access public
	 * @author Grégory Viguier
	 *
	 * @return bool
	 */
	public function is_converting_to_webp() {
		if ( ! function_exists( 'ewww_image_optimizer_get_option' ) ) {
			// No EWWW, no webp.
			return false;
		}

		return (bool) ewww_image_optimizer_get_option( 'ewww_image_optimizer_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() {
		if ( ! function_exists( 'ewww_image_optimizer_get_option' ) ) {
			// No EWWW, no webp.
			return false;
		}

		if ( ewww_image_optimizer_get_option( 'ewww_image_optimizer_exactdn' ) ) {
			// EWWW uses ExactDN (WPR CDN should be disabled for images).
			return true;
		}

		if ( ewww_image_optimizer_get_option( 'ewww_image_optimizer_webp_for_cdn' ) ) {
			// EWWW uses JS to rewrite file extensions.
			return true;
		}

		// Decide if rewrite rules are used.
		if ( ! function_exists( 'ewww_image_optimizer_webp_rewrite_verify' ) ) {
			// Uh?
			return false;
		}

		if ( ! function_exists( 'get_home_path' ) ) {
			require_once ABSPATH . 'wp-admin/includes/file.php';
		}

		if ( ! function_exists( 'extract_from_markers' ) ) {
			require_once ABSPATH . 'wp-admin/includes/misc.php';
		}

		/**
		 * This function returns null if rules are present and valid. Otherwise it returns rules to be inserted.
		 * Note: this also returns null if WP Fastest Cache rules for webp are found in the file.
		 *
		 * @see ewww_image_optimizer_wpfc_webp_enabled()
		 */
		$use_rewrite_rules = ! ewww_image_optimizer_webp_rewrite_verify();

		/**
		 * Filter whether EWW is using rewrite rules for webp.
		 *
		 * @since  3.4
		 * @author Grégory Viguier
		 *
		 * @param bool $use_rewrite_rules True when EWWW uses rewrite rules. False otherwise.
		 */
		return (bool) apply_filters( 'rocket_webp_ewww_use_rewrite_rules', $use_rewrite_rules );
	}

	/**
	 * 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() {
		if ( ! function_exists( 'ewww_image_optimizer_get_option' ) ) {
			// No EWWW, no webp.
			return false;
		}

		if ( ewww_image_optimizer_get_option( 'ewww_image_optimizer_exactdn' ) ) {
			// EWWW uses ExactDN.
			return true;
		}

		if ( ewww_image_optimizer_get_option( 'ewww_image_optimizer_webp_for_cdn' ) ) {
			// EWWW uses JS to rewrite file extensions.
			return true;
		}

		// At this point, the plugin is using rewrite rules or nothing.
		return false;
	}

	/**
	 * 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 = rocket_has_constant( 'EWWW_IMAGE_OPTIMIZER_PLUGIN_FILE' )
				? plugin_basename( rocket_get_constant( 'EWWW_IMAGE_OPTIMIZER_PLUGIN_FILE' ) )
				: 'ewww-image-optimizer/ewww-image-optimizer.php';
		}

		return $this->plugin_basename;
	}

	/** ----------------------------------------------------------------------------------------- */
	/** PRIVATE TOOLS =========================================================================== */
	/** ----------------------------------------------------------------------------------------- */

	/**
	 * Tell if EWWW is active for network.
	 *
	 * @since  3.4
	 * @access private
	 * @author Grégory Viguier
	 *
	 * @return bool
	 */
	private function is_active_for_network() {
		static $is;

		if ( isset( $is ) ) {
			return $is;
		}

		if ( ! is_multisite() ) {
			$is = false;
			return $is;
		}

		if ( ! function_exists( 'is_plugin_active_for_network' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		$is = is_plugin_active_for_network( $this->get_basename() ) && ! get_site_option( 'ewww_image_optimizer_allow_multisite_override' );

		return $is;
	}
}