问我应该把价格计算逻辑放在哪里呢？

EN

namespace App\Calculations;

class Accommodation
{
    /**
     * The rate per night.
     *
     * @var float
     */
    protected $rate;

    /**
     * The amount of nights for the stay.
     *
     * @var int
     */
    protected $nights = 1;

    /**
     * Constructor.
     *
     * @param float $rate
     * @param int   $nights
     */
    public function __construct($rate = 50.00, $nights = 1)
    {
        $this->rate = $rate;
        $this->nights = $nights;
    }

    /**
     * Calculates the accommodation and returns the result.
     *
     * @return float
     */
    public function calculate()
    {
        return $this->rate * $this->nights;
    }
}

$total = (new Accommodation($rate, $nights))->calculate();