form field calculations and mysql

[wrigd411]

I am a php newbie and I have a problem I just cannot figure out. I have a household income and expense calculator form  (inc1, inc2, inc3, exp1, exp2, exp3, exp4)

 

I need to calculate total income, total expenses, net income, potential savings and the largest expense category with values entered from the form.

My calculations are:

$ttl_inc_val = $_POST['ttl_inc] + $inc1 + $inc2 + $inc3;

$ttl_exp_val = $_POST['ttl_exp + $exp1 + $exp2+ $exp3+ $exp4;

$net_val = $_POST['net'] + $inc1 + $inc2 + $inc3 - $exp1 - $exp2 - $exp3 - $exp4;

$p_svgs_val = $_POST['p_svgs'] + $net + $exp4;

 

I still haven't figured out the how-to for the largest expense, but my problem at this point is that I cannot get any of these calculations to post to my database tables (6 in total-don't ask). I did manage to create a few triggers that will calculate my ttl_inc on the income table and another for the expenses table.But that still leaves the other calculations and all are on different tables. I am sure it is probably something silly that I am missing, but I just cannot see it. Probably been staring at this far too long. Any help would be greatly appreciated.

[mike12255]

I think I understand what your going for, just to be sure could you post your code please?

 

also code like this:

$ttl_inc_val = $_POST['ttl_inc] + $inc1 + $inc2 + $inc3;

 

what is ttl_inc? have you already defined $inc1, $inc2, $inc3 through post variables above this code?