public static function clearAll()
  {
    $names = array_keys(self::$_instances);
    foreach ($names as $name) {
      self::clearInstance($name);
    }
  }
public static function clearAll()
  {
    $names = array_keys(self::$_instances);
    foreach ($names as $name) {
      self::clearInstance($name);
    }
  }
public static function clearAll ( ) { $ names = array_keys ( self :: $ _instances ) ; foreach ( $ names as $ name ) { self :: clearInstance ( $ name ) ; } }
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@return null
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