网上看到一段可以利用php代码获取Linux磁盘容量的小脚本:

<?php
header("Content-type: text/plain");

$total = disk_total_space('.');
$free = disk_free_space('.');

echo '空间总量:'.readable_size($total)."\n";
echo "剩余空间:".readable_size($free);

function readable_size($length){
$units = array('B', 'kB', 'MB', 'GB', 'TB');
foreach ($units as $unit) {
if($length>1024)
$length = round($length/1024, 1);
else
break;
}
return $length.' '.$unit;
}
?>

小巧、实用！