Symfony\Component\Finder\Finder::sort PHP 메소드

    public function sort(\Closure $closure)
    {
        $this->sort = $closure;

        return $this;
    }

 /**
  * @param string|callable $by
  * @return $this
  */
 public function sortBy($by = self::SORT_BY_NAME)
 {
     if (is_callable($by)) {
         $this->finder->sort($by);
         return $this;
     }
     switch (strtolower($by)) {
         case self::SORT_BY_NAME:
         case 'name':
             $this->finder->sortByName();
             break;
         case self::SORT_BY_CHANGED_TIME:
         case 'ctime':
             $this->finder->sortByChangedTime();
             break;
         case self::SORT_BY_ACCESSED_TIME:
         case 'atime':
             $this->finder->sortByAccessedTime();
             break;
         case self::SORT_BY_TYPE:
         case 'type':
             $this->finder->sortByType();
             break;
         case self::SORT_BY_MODIFIED_TIME:
         case 'mtime':
             $this->finder->sortByModifiedTime();
             break;
         default:
             throw new \InvalidArgumentException($by . ' is not a supported argument for sorting.');
     }
     return $this;
 }