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<?php
// Parent class
abstract class Car {
    public $name;
    public function __construct($name) {
        $this->name = $name;
    }
    abstract public function intro() : string;
}
 
// Child classes
class Audi extends Car {
    public function intro() : string {
        return "Choose German quality! I'm an $this->name!";
    }
}
 
class Volvo extends Car {
    public function intro() : string {
        return "Proud to be Swedish! I'm a $this->name!";
    }
}
 
 
$audi = new Audi("Audi");
echo $audi->intro();
echo "<br>";
 
$volvo = new Volvo("Volvo");
echo $volvo->intro();
echo "<br>";
 
?>