function __construct($length, $price, $width, $height, $depth) { parent::__construct($price, $width, $height, $depth); $this->length = $length; }
function __construct($author, $pages, $price, $width, $height, $depth) { parent::__construct($price, $width, $height, $depth); $this->pages = $pages; $this->author = $author; }