<?php
      $db = new mysqli("server_address","db_user","db_password","db_name");
      // Check connection
      if ( $db->connect_errno ( ) )
      {
            die("Errore di connessione al database MySQL: " . mysqli_connect_error());
      }

      // Perform queries
      $sql = "SELECT * FROM Libro";

      if (!$result = $db->query($sql) ) {
            die("Errore query");
      }

      while ($book = $result->fetch_assoc()) {
            echo $book['titolo'] . ' ' . $book['n_pagine'];
      }