public static function check(): bool
  {
	  return
      isset(self::$user, self::$table, self::$db) &&
      self::is_init() &&
      self::_get_db();
  }
public static function check(): bool
  {
	  return
      isset(self::$user, self::$table, self::$db) &&
      self::is_init() &&
      self::_get_db();
  }
public static function check ( ) : bool { return isset ( self :: $ user , self :: $ table , self :: $ db ) && self :: is_init ( ) && self :: _get_db ( ) ; }
Checks if all history parameters are set in order to read and write into history
@return bool
Checks if all history parameters are set in order to read and write into history