用十进制表示的重量，需要显示为数字，php

I have the weight grabbed from an xml as 0.800, I want to convert it to 000008. This Eg. 003456 is 345.6 kilograms shows how it is to be represented for heavier weights, could someone give me a heads up as to where I could start with this one?

thanks!

EDIT: I have the solution but does anyone know why it cuts off the last digit? See below:

XML:

<GROSSWEIGHT>345.800</GROSSWEIGHT>

PHP:

$LINE_WEIGHT = ($shipment->COLLO->GROSSWEIGHT*10); // 6 CHARS
sprintf("%06s", $LINE_WEIGHT)
// output 003450

EDIT: If i follow this, it works:

echo str_pad(0.800*10, 6, "0", STR_PAD_LEFT);
// output 000008

AS SOON as I include xml data:

echo $shipment->COLLO->GROSSWEIGHT; // 345.800
echo str_pad($shipment->COLLO->GROSSWEIGHT*10, 6, "0", STR_PAD_LEFT);
// output 003450

Please see pic below:

You'd first need to multiply by 10, then have a look at sprintf, especially the padding option.

use *10 and then "pad-left":

echo str_pad(0.800*10, 6, "0", STR_PAD_LEFT); //000008
echo str_pad(345.6*10, 6, "0", STR_PAD_LEFT); //003456

I'll answer my own question to how I decided to go ahead coding. I used the sprintf solution suggested by simon as it seems a lot cleaner.

XML:

GROSSWEIGHT>0.800</GROSSWEIGHT>

PHP:

$LINE_WEIGHT = (utf8_decode($shipment->COLLO->GROSSWEIGHT)*10); // 6 CHARS
sprintf("%06d", $LINE_WEIGHT);

Thanks everyone!