Code:
<?php
/* get disk space free (in bytes) */
$df = disk_free_space("/var/www");
/* and get disk space total (in bytes) */
$dt = disk_total_space("/var/www");
/* now we calculate the disk space used (in bytes) */
$du = $dt - $df;
/* percentage of disk used - this will be used to also set the width % of the progress bar */
$dp = sprintf('%.2f',($du