How can the formatting of currency values in PHP impact the accuracy of calculations in a webshop or financial application?

When formatting currency values in PHP, it's important to ensure that the values are stored as integers or floats without any formatting characters like commas or currency symbols. If currency values are stored as formatted strings, calculations may result in unexpected errors due to the presence of non-numeric characters. To avoid this issue, it's best to store currency values as raw numbers and only apply formatting when displaying them to users.

// Incorrect way of storing currency value with formatting
$price = "$1,234.56";

// Correct way of storing currency value as a float
$price = 1234.56;

// Example of calculating total price with correct currency values
$quantity = 3;
$total = $price * $quantity;

echo "Total price: $" . number_format($total, 2);