What are the best practices for handling constant values in PHP calculations?

When handling constant values in PHP calculations, it is best practice to define these values as constants using the `define()` function. This ensures that the values remain consistent throughout the code and can be easily updated if needed. Constants should be given descriptive names in uppercase letters to distinguish them from variables. 

// Define constants for constant values in calculations
define('TAX_RATE', 0.10);
define('DISCOUNT_RATE', 0.20);

// Example usage of constants in calculations
$subtotal = 100;
$tax = $subtotal * TAX_RATE;
$total = $subtotal + $tax;
$discount = $total * DISCOUNT_RATE;
$finalTotal = $total - $discount;

echo "Subtotal: $subtotal\n";
echo "Tax: $tax\n";
echo "Total: $total\n";
echo "Discount: $discount\n";
echo "Final Total: $finalTotal\n";

Keywords

constants PHP calculations data types error handling precision

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