Human readable data sizes in PHP

datasizes.php

# Pass in the level of accuracy and optionally if you are talking about speed. Which will add a per seconds suffux.
public static function human_datasize($bytes, $decimals = 2, $speed = false)
{
    $sz = 'BKMGTP';

    if(is_null($bytes)) {
        return 'Unlimited';
    }

    if ($speed) {
        $suffix = 'bps';
    } else {
        $suffix = 'B';
    }

    $factor = floor((strlen($bytes) - 1) / 3);
    $str = sprintf("%.{$decimals}f", $bytes / pow(1024, $factor)) . @$sz[$factor];
    if(substr($str, -1) !== 'B') {
        $str = $str . $suffix;
    }
    return $str;
}