BytesViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Format;

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */

class BytesViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    protected $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');

    public function render($value = NULL, $decimals = 0, $decimalSeparator = '.', $thousandsSeparator = ',') {
        if ($value === NULL) {
            $value = $this->renderChildren();
        }

        if (!is_integer($value) && !is_float($value)) {
            if (is_numeric($value)) {
                $value = (float)$value;
            } else {
                $value = 0;
            }
        }
        $bytes = max($value, 0);
        $pow = floor(($bytes ? log($bytes) : 0) / log(1024));
        $pow = min($pow, count($this->units) - 1);
        $bytes /= pow(2, (10 * $pow));

        return sprintf(
            '%s %s',
            number_format(round($bytes, 4 * $decimals), $decimals, $decimalSeparator, $thousandsSeparator),
            $this->units[$pow]
        );
    }

}