How to ConvertBytes to Human-Readable File Sizes in Kilobytes, Megabytes, and Gigabytes

When working with file sizes stored in bytes, it's often necessary to display them in a more user-friendly format such as kilobytes, megabytes, and gigabytes. Here's a highly efficient PHP function that accomplishes this conversion precisely:

function formatBytes($bytes, $precision = 2) {
    $units = array('B', 'KB', 'MB', 'GB', 'TB');

    $bytes = max($bytes, 0);
    $pow = floor(($bytes ? log($bytes) : 0) / log(1024));
    $pow = min($pow, count($units) - 1);

    // Uncomment one of the following alternatives:
    // $bytes /= pow(1024, $pow);
    // $bytes /= (1 
For example, if you have a byte count of 5445632, using this function with formatBytes(5445632) will output "5.2 MB", displaying the size as megabytes with the specified precision of two decimal places.