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Name File: number.php

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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  HTML
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * HTML helper class for rendering numbers.
 *
 * @package     Joomla.Platform
 * @subpackage  HTML
 * @since       11.1
 */
abstract class JHtmlNumber
{
	/**
	 * Converts bytes to more distinguishable formats such as:
	 * kilobytes, megabytes, etc.
	 *
	 * By default, the proper format will automatically be chosen.
	 * However, one of the allowed unit types may also be used instead.
	 *
	 * @param   integer  $bytes      The number of bytes.
	 * @param   string   $unit       The type of unit to return.
	 * @param   integer  $precision  The number of digits to be used after the decimal place.
	 *
	 * @return  string   The number of bytes in the proper units.
	 *
	 * @since   11.1
	 */
	public static function bytes($bytes, $unit = 'auto', $precision = 2)
	{
		// No explicit casting $bytes to integer here, since it might overflow
		// on 32-bit systems
		$precision = (int) $precision;

		if (empty($bytes))
		{
			return 0;
		}

		$unitTypes = array('b', 'kb', 'MB', 'GB', 'TB', 'PB');

		// Default automatic method.
		$i = floor(log($bytes, 1024));

		// User supplied method:
		if ($unit !== 'auto' && in_array($unit, $unitTypes))
		{
			$i = array_search($unit, $unitTypes, true);
		}

		// TODO Allow conversion of units where $bytes = '32M'.

		return round($bytes / pow(1024, $i), $precision) . ' ' . $unitTypes[$i];
	}
}