3 tables hold money value but they are inputed into
the database without the dollar symbol (without $). 
So the value could be 3.00 etc...  

I want to calculate by adding (+) them together.  A
username is in each table.  So only the username
matching in each table must calculate.  So if in table
1 username Chris has 3.00 and in table 2 Chris has
5.00 we need to add the two together.

If you value equals 0 or NULL or blank it should
either a) ignore it or b) add it as a zero.

What is the best PHP code to use for this inside a PHP


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