How can PHP functions like number_format impact the accuracy of financial calculations?

Using PHP functions like number_format can impact the accuracy of financial calculations because it may round numbers or add formatting that can introduce small errors. To ensure accuracy in financial calculations, it is recommended to perform calculations with raw numbers and only apply formatting at the end when displaying the result.

$number1 = 10.555;
$number2 = 20.333;

// Perform calculations with raw numbers
$total = $number1 + $number2;

// Apply formatting only when displaying the result
echo number_format($total, 2);