Eccube\EventListener\RequestDumpListener::logKeyValuePair PHP Метод

    protected function logKeyValuePair($key, $value, $prefix = '')
    {
        if (in_array($key, $this->excludeKeys)) {
            return '';
        }
        if (is_null($value) || is_scalar($value) || is_object($value) && method_exists($value, '__toString')) {
            $copy_value = $value;
        } elseif (is_object($value)) {
            try {
                $copy_value = '[object ' . serialize($value) . ']';
            } catch (\Exception $e) {
                return $e->getMessage() . PHP_EOL;
            }
        } else {
            $copy_value = $value;
            if (is_array($copy_value)) {
                foreach ($copy_value as $key => &$val) {
                    if (in_array($key, $this->excludeKeys) && $prefix != '[header]') {
                        // XXX header にもマスクがかかってしまう
                        $val = '******';
                    }
                }
            }
            try {
                $copy_value = '[' . serialize($copy_value) . ']';
            } catch (\Exception $e) {
                return $e->getMessage() . PHP_EOL;
            }
        }
        return '  ' . $prefix . ' ' . $key . '=' . $copy_value . PHP_EOL;
    }