What are the best practices for handling and formatting large numbers in PHP to ensure accuracy and readability?

When handling large numbers in PHP, it is important to ensure accuracy and readability. One way to achieve this is by using number_format() function to format the numbers with thousands separators and decimal points. This function allows you to specify the number of decimal places and the characters used for separators. Additionally, using the bcmath extension can help in performing arithmetic operations on large numbers with precision.

// Example of formatting a large number with number_format()
$largeNumber = 1000000.12345;
$formattedNumber = number_format($largeNumber, 2, '.', ',');
echo $formattedNumber; // Output: 1,000,000.12

// Example of performing arithmetic operations on large numbers with bcmath extension
$num1 = '123456789012345678901234567890';
$num2 = '987654321098765432109876543210';
$sum = bcadd($num1, $num2);
echo $sum; // Output: 111111111011111111011111111100