What are the best practices for handling numerical calculations and formatting in PHP?

When handling numerical calculations and formatting in PHP, it is important to ensure accuracy and proper formatting of the results. To achieve this, you can use built-in PHP functions such as number_format() for formatting numbers with specified decimal points and thousands separators. Additionally, using functions like round() can help in rounding off decimal numbers to a specified precision.

// Example of formatting a number with decimal points and thousands separator
$number = 1234567.89;
$formatted_number = number_format($number, 2, '.', ',');
echo $formatted_number; // Output: 1,234,567.89

// Example of rounding off a number to a specified precision
$decimal_number = 12.34567;
$rounded_number = round($decimal_number, 2);
echo $rounded_number; // Output: 12.35