public function apri_conn ($uname,$psw){
       echo $port;
       $dbc='host='.$this->host.' port='.$this->port.' dbname='.$this->dbase.' user='.$uname.' password='.$psw;
       $dbconn = pg_connect($dbc) or die ("connessione non riuscita");
       $x=setcookie("Aeroporto", "$dbc" , time()+3600);  /* scade in 1 ora */
       return $dbconn;
    }