<?php

/**
 * Parse a human readable string for a number of bytes
 *
 * @param string Input string
 * @return int Number of bytes
 */
function parse_bytes($str)
{
	if (is_numeric($str))
		return intval($str);
		
	if (preg_match('/([0-9]+)([a-z])/i', $str, $regs))
	{
		$bytes = floatval($regs[1]);
		switch (strtolower($regs[2]))
		{
			case 'g':
				$bytes *= 1073741824;
				break;
			case 'm':
				$bytes *= 1048576;
				break;
			case 'k':
				$bytes *= 1024;
				break;
		}
	}

	return intval($bytes);
}

/**
 * Create a human readable string for a number of bytes
 *
 * @param int Number of bytes
 * @return string Byte string
 */
function show_bytes($bytes)
{
	if ($bytes > 1073741824)
	{
		$gb = $bytes/1073741824;
		$str = sprintf($gb >= 10 || $gb-intval($gb) == 0 ? "%d GB" : "%.1f GB", $gb);
	}
	else if ($bytes > 1048576)
	{
		$mb = $bytes/1048576;
		$str = sprintf($mb >= 10 || $mb-intval($mb) == 0 ? "%d MB" : "%.1f MB", $mb);
	}
	else if ($bytes > 1024)
		$str = sprintf("%d KB", round($bytes/1024));
	else
		$str = sprintf('%d B', $bytes);

	return $str;
}

/**
 * Remove all non-ascii and non-word chars
 * except . and -
 */
function asciiwords($str)
{
	return preg_replace(array('/\s+/', '/[^a-z0-9\_\-\.]/i'), array('_',''), $str);
}


?>