What are the best practices for formatting numbers in PHP to include thousand separators?

When displaying numbers in PHP, it is often helpful to include thousand separators to improve readability. One common way to achieve this is by using the number_format() function in PHP. This function allows you to format a number with grouped thousands and specify the number of decimal places to include. By using number_format(), you can easily add thousand separators to your numbers in PHP.

$number = 1000000;
$formatted_number = number_format($number);
echo $formatted_number; // Output: 1,000,000