Question

I have simple line class autorization extends mysql and it causes Fatal error: Call to a member function close() on a non-object in… On that line is

function __destruct(){
        $this->connection->close();
    }

Constructor

$mysqli = new mysqli(*****);
$this->connection = $mysqli;

at the moment no other methods ot class mysql are not used

Answer 1

Connection property is not initialised . If you have a constructor in mysql class make sure that you haven’t completely overwritten it by specifying a constructor in autorization class. This can be achieved by adding:

parent::__constructor( any_params_to_mysql_go_here );

Btw from your question is not clear who maintains the connection property: mysql class or not?