How can PHP developers improve the readability and efficiency of their code when performing arithmetic operations?

PHP developers can improve the readability and efficiency of their code when performing arithmetic operations by using clear variable names, breaking down complex calculations into smaller steps, and utilizing built-in PHP functions for common operations like rounding or formatting numbers.

// Example of improving readability and efficiency in arithmetic operations
$price = 25.99;
$taxRate = 0.08;

// Calculate the total price including tax
$taxAmount = $price * $taxRate;
$totalPrice = $price + $taxAmount;

echo "Total price including tax: $" . number_format($totalPrice, 2);