Format Filesize

formatsize.cs

// http://www.cnblogs.com/yaob/archive/2011/05/14/2046013.html
public string formatSize(long size)
{
    if (size == 0) return "0";
    string[] sizetext = new string[] { "B", "KB", "MB", "GB", "TB", "PB" };
    int i = (int)Math.Floor(Math.Log(size, 1024));
    return Math.Round(size / Math.Pow(1024, i), 2).ToString() + " " + sizetext[i];
}

formatsize.js

function formatSize(size) {
    var sizetext = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
        i = Math.floor(Math.log(size)/Math.log(1024));
    return (size/Math.pow(1024, i)).toFixed(2) + ' ' + sizetext[i];
}

formatsize.php

function format($size) {
    $sizetext = array('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');
    return round($size/pow(1024,($i=floor(log($size,1024)))),2).' '.$sizetext[$i];
}