Bytes to KB/MB/GB/TB converter

byte2.php

<?php

function byte2($bytes) {
	$size = array('B','KB','MB','GB','TB');
	$factor = floor(log($bytes, 1024));
	$format = $factor > 2 ? '%.1F %s' : '%u %s';
	return sprintf($format, $bytes / pow(1024, $factor), $size[$factor]);
}