Bytes formatting (KB, MB, GB)

formatBytes.php

<?php
/**
     * Format an amount of bytes using a SI metric conversion
     * 
     * Note: 1024 to express the format in KiB, MiB
     *
     * @author Alfredo Torre <alfredo@dubishere.com>
     * @see https://en.wikipedia.org/wiki/Kibibyte
     * @param string/int $pBytes
     * @param int $piPrecision
     * @return string The formatted bytes dimension
     */
    private function formatBytes($pBytes, $piPrecision = 2) {
        $iBytes = max((int) $pBytes, 0);
        $aUnits = array('B', 'KB', 'MB', 'GB', 'TB');
        $iBase = log($iBytes, 1000);
        $iFormatted = round(pow(1000, $iBase - floor($iBase)), $piPrecision);

        return sprintf('%s %s', $iFormatted, $aUnits[floor($iBase)]);
    }