class Car {
protected static $brand = 'no brand';
public static function brand() {
return static::$brand . "<br />";
}
}
class Geep extends Car {
protected static $brand = 'Grand Cherokee Trackhawk';
}
class BMW extends Car {
protected static $brand = 'BMW X6 M';
}
echo (new Car)->brand();
echo (new Geep)->brand();
$object = new BMW();
echo $object->brand();
/*
run:
no brand
Grand Cherokee Trackhawk
BMW X6 M
*/