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";
}
?>