function getContactById($id) { $connection = new mysqli("localhost", "username", "password", "myDB"); $query = "SELECT * FROM contacts WHERE id=$id"; $result = $connection->query($query); $contact = $result->fetch_assoc(); $connection->close(); return $contact; }In this example, we are creating a function called getContactById that takes in an ID and returns the contact associated with that ID in a MySQL database. We connect to the database using the mysqli function, then perform the SELECT query to retrieve the contact's data using the provided ID. We then use the fetch_assoc function to place the data into an associative array, close the connection to the database, and return the resulting contact. The package/library that could potentially be used for this functionality could be the MySQLi extension/library for PHP.