. (int) round( $sizes[1] * $ratio ) . '"';
		}

		return false;
	}

	/**
	 * Assign width and height attributes to the img tag.
	 *
	 * @param string $image IMG tag.
	 * @param string $width_height Width/Height attributes in ready state like [height="100" width="100"].
	 *
	 * @return string IMG tag after adding attributes otherwise return the input img when error.
	 */
	private function assign_width_height( string $image, string $width_height ): string {
		// Remove old width and height attributes if found.
		$changed_image = preg_replace( '/\s(height|width)=(?:[\'"]?(?:[^\'\"\s]+)*[\'"]?)?/i', '', $image );
		$changed_image = preg_replace( '/<\s*img/i', '<img ' . $width_height, $changed_image );

		if ( null === $changed_image ) {
			return $image;
		}

		return $changed_image;
	}

	/**
	 * Check if the image exists, internal or external image.
	 *
	 * @param string $image    Image Url for external and Image absolute path for internal.
	 * @param bool   $external If this image is external or not.
	 *
	 * @return bool If image exists or not.
	 */
	private function image_exists( string $image, $external = false ): bool {
		if ( ! $image ) {
			return false;
		}

		if ( ! $external ) {
			return $this->filesystem->exists( $image );
		}

		$file_headers = get_headers( $image );

		if ( ! $file_headers ) {
			return false;
		}

		return false !== strstr( $file_headers[0], '200' );
	}

	/**
	 * Check if we can specify image dimensions for all images.
	 *
	 * @return bool Can we or not.
	 */
	private function can_specify_dimensions_images(): bool {
		/**
		 * Filter images dimensions attributes process.
		 *
		 * @since 2.2
		 *
		 * @param bool $specify_dimensions Do the job or not.
		 */
		return apply_filters( 'rocket_specify_image_dimensions', false )
			||
			$this->options->get( 'image_dimensions', false );
	}

	/**
	 * Check if we can specify image dimensions for one image.
	 *
	 * @param string $image Full img tag.
	 *
	 * @return false|string false if we can't specify for this image otherwise get img src attribute.
	 */
	private function can_specify_dimensions_one_image( string $image ) {
		// Don't touch lazy-load file (no conflict with Photon (Jetpack)).
		if (
			false !== strpos( $image, 'data-lazy-original' )
			||
			false !== strpos( $image, 'data-no-image-dimensions' )
			||
			! preg_match( '/\s+src\s*=\s*[\'"](?<url>[^\'"]+)/i', $image, $src_match )
		) {
			return false;
		}

		return $src_match['url'];
	}

	/**
	 * Get Image sizes.
	 *
	 * @param string $image_url Image url to get sizes for.
	 *
	 * @return array|false Get image sizes otherwise false.
	 */
	private function get_image_sizes( string $image_url ) {
		if ( $this->is_external_file( $image_url ) ) {
			$image_url = $this->normalize_url( $image_url );

			if ( ! $this->can_specify_dimensions_external_images() ) {
				Logger::debug(
					'Specify Image Dimensions failed because you/server disabled specifying dimensions for external images.',
					[ 'image_url' => $image_url ]
				);
				return false;
			}

			if ( ! $this->image_exists( $image_url, true ) ) {
				Logger::debug(
					'Specify Image Dimensions failed because external image not found.',
					[ 'image_url' => $image_url ]
				);
				return false;
			}

			$sizes = $this->getimagesize( $image_url );

			if ( ! $sizes ) {
				Logger::debug(
					'Specify Image Dimensions failed because image is not valid.',
					[ 'image_url' => $image_url ]
				);
				return false;
			}

			return $sizes;
		}

		$local_path = $this->get_local_path( $image_url );

		if ( ! $this->image_exists( $local_path, false ) ) {
			Logger::debug(
				'Specify Image Dimensions failed because internal image is not found.',
				[ 'image_url' => $image_url ]
			);

			return false;
		}

		$sizes = $this->getimagesize( $local_path );

		if ( ! $sizes ) {
			Logger::debug(
				'Specify Image Dimensions failed because image is not valid.',
				[ 'image_url' => $image_url ]
			);

			return false;
		}

		return $sizes;
	}

	/**
	 * Gets image sizes for the given file
	 *
	 * @param string $filename File we want to retrieve information about.
	 *
	 * @return array|false
	 */
	private function getimagesize( string $filename ) {
		$file = new SplFileInfo( strtok( $filename, '?' ) );

		if ( 'svg' === $file->getExtension() ) {
			return $this->svg_getimagesize( $filename );
		}

		return getimagesize( $filename );
	}

	/**
	 * Gets image sizes for the given SVG file
	 *
	 * Uses the width/height attributes if present, or fallback to viewBox attribute
	 *
	 * @param string $filename File we want to retrieve information about.
	 *
	 * @return array|false
	 */
	private function svg_getimagesize( string $filename ) {
		$svgfile = simplexml_load_file( rawurlencode( $filename ), 'SimpleXMLElement', rocket_get_constant( 'LIBXML_NOERROR', 32 ) | rocket_get_constant( 'LIBXML_NOWARNING', 64 ) );

		if ( ! $svgfile ) {
			return false;
		}

		$width  = $this->format_svg_value( (string) $svgfile->attributes()->width );
		$height = $this->format_svg_value( (string) $svgfile->attributes()->height );
		$size   = [];

		if (
			! empty( $width )
			&&
			! empty( $height )
		) {
			$size[0] = $width;
			$size[1] = $height;
			$size[2] = 0;
			$size[3] = 'width="' . absint( $width ) . '" height="' . absint( $height ) . '"';

			return $size;
		}

		$view_box = preg_split( '/[\s,]+/', (string) $svgfile->attributes()->viewBox );

		if ( ! empty( $view_box ) ) {
			if (
				! empty( $view_box[2] )
				&&
				! empty( $view_box[3] )
			) {
				$size[0] = $view_box[2];
				$size[1] = $view_box[3];
				$size[2] = 0;
				$size[3] = 'width="' . absint( $size[0] ) . '" height="' . absint( $size[1] ) . '"';

				return $size;
			}

			return false;
		}

		return false;
	}

	/**
	 * Formats the SVG width/height value in case of unusual units
	 *
	 * @since 3.10.8
	 *
	 * @param string $value The value of the SVG width/height attribute.
	 *
	 * @return string
	 */
	private function format_svg_value( string $value ): string {
		// No unit, we can use the value directly.
		if ( is_numeric( $value ) ) {
			return $value;
		}

		if ( empty( $value ) ) {
			return $value;
		}

		$px_pattern = '/([0-9]+)\s*px/i';

		// If pixel unit, remove the unit and return the numeric value.
		if ( preg_match( $px_pattern, $value ) ) {
			return preg_replace( $px_pattern, '$1', $value );
		}

		// Return an empty string for other units.
		return '';
	}

	/**
	 * Normalize relative url to full url.
	 *
	 * @param string $url Url to be normalized.
	 *
	 * @return string Normalized url.
	 */
	private function normalize_url( string $url ): string {
		$url_host = wp_parse_url( $url, PHP_URL_HOST );

		if ( empty( $url_host ) ) {
			$relative_url        = ltrim( wp_make_link_relative( $url ), '/' );
			$site_url_components = wp_parse_url( site_url( '/' ) );
			return $site_url_components['scheme'] . '://' . $site_url_components['host'] . '/' . $relative_url;
		}

		return $url;
	}
}