如何在PHP抽象类中使用自定义子参数实现常用方法？

Question

I have an abstract PHP class called 'Car'.

abstract class Car
{
    // Extending class must define this method
    abstract protected function getBrand();
    abstract protected function getCars();

    // Common methods
    public function printBrand() {
        print $this->getBrand() . PHP_EOL;
    }

    public function printUrl() {
        print $this->getUrl() . PHP_EOL;
    }
}

This abstract class implements a function getCars(), but this function has basically the same content for each child but with different variables. As there are a couple dozen of children, this method getCars() gets redundant. Some children may also need to override the getCars() function.

Should I just copy the getCars() code to the abstract class and replace the variables with $this->getVar()? Or is this not good practice? Thanks in advance.

Edit: If this is the way to go, can some specific children override this abstract function?