顯示目前硬碟可使用容量

<?php

echo bytes_to_kbmbgb(disk_free_space('//')) ;
function bytes_to_kbmbgb($filesize){
	if ($filesize<1048576) return number_format($filesize/1024,1) . " KB";
	if ($filesize>=1048576 && $filesize<1073741824) return number_format($filesize/1048576,1) . " MB";
	if ($filesize>=1073741824 ) return number_format($filesize/1073741824,1) . " GB";
}
?>