Basic PHP Class inheritance example

<?php
Class User {
    public $first_name;
    public $last_name;
    public $email;
    public function setUserData($first_name, $last_name, $email){
        $this->first_name = $first_name;
        $this->last_name = $last_name;
        $this->email = $email;
    }
}

Class Subscriber extends User {
    public $plan;
    public $amount;
    public function setSubscriberData($first_name, $last_name, $email, $plan, $amount){
        // Get setUserData method from the parent 
        // in order to set values for the inherited properties
        parent::setUserData($first_name, $last_name, $email);
        //set values for the properties that
        // are speciffic to this class
        $this->plan = $plan;
        $this->amount = $amount;
    }
}

$bob = new User;
$carla = new Subscriber;
$bob->setUserData('Bob', 'Smith', '[email protected]');
$carla->setSubscriberData('Carla', 'Smith', '[email protected]', 'monthly', 10);

echo 'Full name: ' . $bob->first_name . ' ' . $bob->last_name . '<br>';
echo 'Email: ' . $bob->email . '<br>';
echo '<hr>';
echo 'Full name: ' . $carla->first_name . ' ' . $carla->last_name . '<br>';
echo 'Email: ' . $carla->email . '<br>';
echo 'Pays ' . $carla->amount . ' ' . $carla->plan . '<br>';
echo '<hr>';
?>