What are the advantages of using private methods in PHP classes for formula calculations?

Using private methods in PHP classes for formula calculations helps encapsulate the logic within the class, making it easier to maintain and understand. It also promotes code reusability by allowing the formula calculation logic to be used in multiple methods within the class. Additionally, private methods can only be accessed within the class, ensuring that the formula calculation logic is not accidentally modified or misused outside of the class. 

class Calculator {
    private function calculateSum($a, $b) {
        return $a + $b;
    }

    public function calculateAverage($a, $b) {
        return $this->calculateSum($a, $b) / 2;
    }
}

$calculator = new Calculator();
echo $calculator->calculateAverage(10, 20); // Output: 15

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private methods PHP classes formula calculations advantages

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