Question

Trying to create a GPA Calculator. I have a form that submits to a php file and then stores all data from the form in a php array(). The calculator works great until I enter the same value. I think this wont make sense until I show some pictures:

Here is the problem in an image:

So in the first image I enter a A and then another A which outputs array(1) { [0]=> float(4.5) } when using var_dump()

And in the second image the var_dump() is array(2) { [0]=> float(4) 1=> float(3.5) }

It is skipping the first row in the first image… just in case A is supposed to equal 4.0 in REG and 4.5 in HONORS. It might be the array_combine()

Here is my php code:

//$_POST['grades'] for the grades <option> and $_POST['types'] for the type (REG, HONORS)
foreach(array_combine($_POST['grades'], $_POST['types']) as $code => $count)
{

    if ($code == "A")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 4.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = 4.5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 5.0;
        }
    }
    else if ($code == "B")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 3.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = 3.5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 4.0;
        }
    }
    else if ($code == "C")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 2.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = 2.5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 3.0;
        }
    }
    else if ($code == "D")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 1.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = 1.5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 2.0;
        }
    }
    else if ($code == "F")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 0.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = .5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 1.0;
        }
    }


}

It might be the whole foreach() statement that needs reworking… I am up to writing the logic again if anyone says so…

I don’t want to clog up the question with code so if you absolutely need the html just ask and I will add in an edit.

EDIT: I am also thinking I need to rewrite the logic… I have never used array_combine() before… I just need to make sure the corresponds with the related

Thanks for the help!

Answer 1

look at this array and output look the VALUES “a” which becomes the key of the resultant array,
so if u want the full array to be combined with the key of first array then first array must kave unique values.

  <?php
    print_r(array_combine(Array('a','a','b'), Array(1,2,3)));
    ?>
    Returns:
    Array
    (
        [a] => 2
        [b] => 3
    )

solution (may not be the best )

foreach($_POST['grades'] as $KEY=>$code)
{
   $count  = $_POST['types'][$KEY];
   if ($code == "A")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 4.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = 4.5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 5.0;
        }
    }
    else if ($code == "B")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 3.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = 3.5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 4.0;
        }
    }
    else if ($code == "C")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 2.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = 2.5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 3.0;
        }
    }
    else if ($code == "D")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 1.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = 1.5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 2.0;
        }
    }
    else if ($code == "F")
    {
        if ($count == "REGULAR")
        {
            $GradeArray[] = 0.0;
        }
        else if ($count == "HONORS")
        {
            $GradeArray[] = .5;
        }
        else if ($count == "COLLEGE")
        {
            $GradeArray[] = 1.0;
        }
    }

}