Format bytes to kb Mb Gb or Tb automaticaly.

gistfile1.php

<?php
function formatBytes($size, $precision = 2)
{
    if($size== 0) {
        return 0;
    }
    $base = log($size) / log(1024);
    $suffixes = array('o', 'kb', 'Mb', 'Gb', 'Tb');

    return round(pow(1024, $base - floor($base)), $precision) . $suffixes[floor($base)];
}