Human redable sizes

make_pretty.php

<?php

// http://www.geekality.net/2010/11/17/php-output-a-number-of-bytes-in-a-human-readable-way/

function make_pretty($bytes)
{
    $symbols = array('B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB');
    $exp = floor(log($bytes) / log(1024));

    return sprintf('%.2f '.$symbols[$exp], $bytes/pow(1024, floor($exp)));
}

// Examples
echo make_pretty(167892598784); // 156.36 GiB
echo make_pretty(719267016);    // 685.95 MiB
echo make_pretty(114893);       // 112.20 KiB
echo make_pretty(6218);         // 6.07 KiB
echo make_pretty(42);           // 42.00 B