[Davey]

Using that corrected code (in your last post), you must not output the variable $result_allweight, but you must output the variable

PHP Code:

$result_allweight['total'] 


see if that works outputting that variable in the template instead.
You can also remove those comments;

PHP Code:

/* 
$result_allweight['total']
*/ 


They were just an instruction to tell you what I said above in this post.