test connessione DB

mysqli Object
(
    [affected_rows] => 0
    [client_info] => mysqlnd 7.4.33
    [client_version] => 70433
    [connect_errno] => 0
    [connect_error] => 
    [errno] => 0
    [error] => 
    [error_list] => Array
        (
        )

    [field_count] => 0
    [host_info] => 46.254.38.83 via TCP/IP
    [info] => 
    [insert_id] => 0
    [server_info] => 5.6.51-log
    [server_version] => 50651
    [sqlstate] => 00000
    [protocol_version] => 10
    [thread_id] => 79520963
    [warning_count] => 0
)