class User { private $phone; public function setPhone($phone) { $this->phone = $phone; } } $user = new User(); $user -> setPhone('1234567890');In this code example, we define a class called User with a private property called phone. We then define a public function called setPhone, which takes a phone number argument and sets it to the phone property using the current object instance. Finally, we create a new User object and call the setPhone method with a phone number argument. The package library for this example is native PHP as we are not using any external library or framework.