In PHP, what are alternative approaches to using the round() function for calculating progress bar values to avoid potential issues with rounding and accuracy?

When using the round() function in PHP to calculate progress bar values, there can be issues with rounding and accuracy that result in unexpected values. To avoid these problems, alternative approaches such as using number_format() or multiplying and dividing by a power of 10 before and after rounding can be used to ensure precision in the calculation.

// Using number_format() to avoid rounding issues
$progress = 75.6789;
$progressPercentage = number_format($progress, 2);

echo $progressPercentage; // Output: 75.68

// Multiplying and dividing by a power of 10 to ensure precision
$progress = 75.6789;
$precision = 100; // 2 decimal places
$progressPercentage = round($progress * $precision) / $precision;

echo $progressPercentage; // Output: 75.68