protected function maybeCompressCssCode($css)
    {
        if (($benchmark = !empty($this->options['benchmark']) && $this->options['benchmark'] === 'details')) {
            $time = microtime(true);
        }
        $css = (string) $css; // Force string value.

        if (isset($this->options['compress_css_code'])) {
            if (!$this->options['compress_css_code']) {
                $disabled = true; // Disabled flag.
            }
        }
        if (!$css || !empty($disabled)) {
            goto finale; // Nothing to do.
        }
        if (strlen($css) > 1000000) {
            // Exclude VERY large files. Too time-consuming.
            // Should really be compressed ahead-of-time anyway.
            goto finale; // Don't compress HUGE files.
        }
        try { // Catch CSS compression-related exceptions.
            if (!($compressed_css = \WebSharks\CssMinifier\Core::compress($css))) {
                // `E_USER_NOTICE` to avoid a show-stopping problem.
                trigger_error('CSS compression failure.', E_USER_NOTICE);
            } else {
                $css = $this->stripUtf8Bom($compressed_css);
            } // Use compressed CSS file.
        } catch (\Exception $exception) {
            trigger_error($exception->getMessage(), E_USER_NOTICE);
        }
        finale: // Target point; finale/return value.

        if ($css) {
            $css = trim($css);
        }
        if ($benchmark && !empty($time) && $css && empty($disabled)) {
            $this->benchmark->addTime(
                __FUNCTION__,
                $time, // Caller, start time, task performed.
                sprintf('compressing CSS w/ checksum: `%1$s`', md5($css))
            );
        }
        return $css;
    }