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Home Forums Back End how do you do math in php?

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  • #30170
    cybershot
    Participant

    I want to know how you do math in php? for example. Lets say I have a database that is to hold information about personal loans. So I store a number in the database. I know that I can retrieve the information with a query. So is it just that you use the query and assign it to a variable? Like

    $amount = “SELECT amount FROM tblAMOUNT”;

    The idea that I am trying to figure out is if you have a form to enter an amount for a payment. How to deduct the amount entered from the last amount entered? Make sense?

    #80501
    Bob
    Member

    Take a read here, I personally find this a very helpful site.

    Anyway, math in PHP can be done with so-called operators.
    Say you have 2 amounts entered, one called $amountOne and the other $amountTwo.
    To subtract the first from the latter one, you could do this:



    $amountOne = 5;
    $amountTwo = 10;
    $newAmount = $amountTwo - $amountOne;

    echo "$newAmount"

    ?>
    #79246
    ImpInaBox
    Member

    Er… You’re mixing up database queries and arithmetic here. I think you need to sit down for a few days with a good PHP/MySQL primer!

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