_cleanDir() public method

Recursive function for cleaning cache file in the given directory
public _cleanDir ( string $dir, string $group = false, string $mode = 'ingroup' ) : boolean
$dir string directory complete path (with a trailing slash)
$group string name of the cache group
$mode string flush cache mode : 'old', 'ingroup', 'notingroup', 'callback_myFunction'
return boolean true if no problem
 /**
  * Garbage collect expired cache data
  *
  * @return  boolean
  *
  * @since   11.1
  */
 public function gc()
 {
     $result = true;
     static::$CacheLiteInstance->setOption('automaticCleaningFactor', 1);
     static::$CacheLiteInstance->setOption('hashedDirectoryLevel', 1);
     $success1 = static::$CacheLiteInstance->_cleanDir($this->_root . '/', false, 'old');
     if (!($dh = opendir($this->_root . '/'))) {
         return false;
     }
     while ($file = readdir($dh)) {
         if ($file != '.' && $file != '..' && $file != '.svn') {
             $file2 = $this->_root . '/' . $file;
             if (is_dir($file2)) {
                 $result = $result && static::$CacheLiteInstance->_cleanDir($file2 . '/', false, 'old');
             }
         }
     }
     $success = $success1 && $result;
     return $success;
 }