how make price of an item go up on weekends with laravel

I want to make the price of an item go up on weekends or on Saturdays and Sundays, but I’m stacked and don’t know how to make it with Laravel. can someone help me please

please give an example or a hint how do I make the price of an item go up when selecting Saturday and Sunday in Laravel

I already know how to get the day of the date…