then use imap_get_quotaroot().....
or use this one (works with qmail):
function get_quotaroot() {
if(!$socket = @fsockopen("your server", your port);
return false;
fgets($socket, 1024);
fputs($socket, "a001 LOGIN ".$username." ".$password."\n");
fgets($socket, 1024);
fputs($socket, "a002 GETQUOTAROOT INBOX\n");
fgets($socket, 1024);
$result = fgets($socket, 1024);
fputs($socket, "a003 LOGOUT\n");
fgets($socket, 1024);
sscanf($result, '* QUOTA "ROOT" (STORAGE %d %d MESSAGE %d %d', $usedSize, $maxSize, $usedNum, $maxNum);
return array("usedSize" => $usedSize, "maxSize" => $maxSize, "usedNum" => $usedNum, "maxNum" => $maxNum);
}