What strategies can be employed to improve the readability and maintainability of PHP code that involves multiple conditional checks and calculations?

To improve the readability and maintainability of PHP code that involves multiple conditional checks and calculations, one strategy is to break down complex logic into smaller, more manageable functions or methods. This can help make the code easier to understand and maintain. Additionally, using meaningful variable names and comments can also enhance readability.

// Example of breaking down complex logic into smaller functions
function calculateTotalPrice($price, $quantity) {
    return $price * $quantity;
}

function applyDiscount($totalPrice, $discount) {
    return $totalPrice - ($totalPrice * $discount);
}

$price = 10;
$quantity = 5;
$discount = 0.1;

$totalPrice = calculateTotalPrice($price, $quantity);
$finalPrice = applyDiscount($totalPrice, $discount);

echo "Final price after discount: $finalPrice";