class Product { protected $basePrice = 50; // default price of the product protected $customizationPrice = 0; // default customization price public function addCustomizationPrice($price) { $this->customizationPrice += $price; // adds the customization price } public function getPrice() { return $this->basePrice + $this->customizationPrice; // returns the final price after adding the base and customization price } }The code above is a simple implementation of the Product class with the addCustomizationPrice() and getPrice() functions. With this code, the final price of a product can be calculated with the addition of both the base price and the customization price. This function can be found in several PHP libraries such as Laravel, Symfony, and Magento.