How can entries from an old guestbook be transferred to a new one created in PHP?

To transfer entries from an old guestbook to a new one created in PHP, you can retrieve the entries from the old guestbook database and insert them into the new guestbook database. This can be done by querying the old database, fetching the entries, and then inserting them into the new database using SQL queries.

// Connect to the old guestbook database
$old_db = new mysqli('old_host', 'old_username', 'old_password', 'old_database');

// Connect to the new guestbook database
$new_db = new mysqli('new_host', 'new_username', 'new_password', 'new_database');

// Retrieve entries from the old guestbook
$old_entries = $old_db->query("SELECT * FROM guestbook");

// Insert entries into the new guestbook
while ($entry = $old_entries->fetch_assoc()) {
    $new_db->query("INSERT INTO guestbook (name, message) VALUES ('{$entry['name']}', '{$entry['message']}')");
}

// Close database connections
$old_db->close();
$new_db->close();