class User { private $email; // Setter function for email public function setEmail($email) { $this->email = $email; } } // Create a new User object $user = new User(); // Set the email using setEmail() $user->setEmail("example@example.com"); // Get the email using getEmail() $email = $user->getEmail(); echo $email; // Output: example@example.comIn this example, we create a User class with a private email property and a public setEmail() function to set the email address. We then create a new User object, set the email using setEmail(), and retrieve the email using the getEmail() function. The package library for this example code is PHP itself. The setEmail() function is a built-in function of the PHP language.