How can PHP be utilized to automate the calculation of fuel surcharges and toll fees in an online shop shipping module?

// Function to calculate fuel surcharge based on distance
function calculateFuelSurcharge($distance, $fuelCostPerMile) {
    return $distance * $fuelCostPerMile;
}

// Function to calculate toll fees based on toll rate per mile
function calculateTollFees($distance, $tollRatePerMile) {
    return $distance * $tollRatePerMile;
}

// Example of how to use the functions
$distance = 100; // Distance in miles
$fuelCostPerMile = 0.25; // Fuel cost per mile
$tollRatePerMile = 0.05; // Toll rate per mile

$fuelSurcharge = calculateFuelSurcharge($distance, $fuelCostPerMile);
$tollFees = calculateTollFees($distance, $tollRatePerMile);

echo "Fuel surcharge: $" . $fuelSurcharge . "\n";
echo "Toll fees: $" . $tollFees . "\n";