/**
  * @param array $params
  * @see Xhprof::__construct()
  */
 public function __construct(array $params = [])
 {
     parent::__construct($params);
     $flags = isset($params['flags']) ? $params['flags'] : 0;
     $options = isset($params['exclude']) ? ['ignored_functions' => $params['exclude']] : [];
     Xhprof::enable($flags, $options);
     $this->sprofiler = new SectionProfiler();
 }