hello world1731642476object(mysqli)#1 (19) {
  ["affected_rows"]=>
  NULL
  ["client_info"]=>
  NULL
  ["client_version"]=>
  int(50012)
  ["connect_errno"]=>
  int(1045)
  ["connect_error"]=>
  string(61) "Access denied for user 'dg'@'localhost' (using password: YES)"
  ["errno"]=>
  NULL
  ["error"]=>
  NULL
  ["error_list"]=>
  NULL
  ["field_count"]=>
  NULL
  ["host_info"]=>
  NULL
  ["info"]=>
  NULL
  ["insert_id"]=>
  NULL
  ["server_info"]=>
  NULL
  ["server_version"]=>
  NULL
  ["stat"]=>
  NULL
  ["sqlstate"]=>
  NULL
  ["protocol_version"]=>
  NULL
  ["thread_id"]=>
  NULL
  ["warning_count"]=>
  NULL
}
NULL