How Much Does It Cost To Do A Code.Org Training Car Loan Calculator – Php Basic Programming

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Car Loan Calculator – Php Basic Programming

First we need to create a new PHP file: simplecarloancalculator.php. A PHP file is treated by the web server as a normal HTML file except for the code written inside a php tag.

We start by creating a car loan calculator HTML form that submits data back to this web page.

Car price: Terms: Interest rate: The above code will create a form with three text boxes and a button.

Car price: ___
Term: ___
Interest rate: ___
[Calculate]



Can be translated to:

When the calculation button is pressed the data in the text boxes will be sent to the page named: simplecarloancalculator.php (the page we all have already loaded in our web browser). Our current page simplecarloancalculator.php will reload and we will have access to the data entered in the form of an array named $_POST.

To use the data entered in the car price text box we use $_POST[carPrice], where carPrice is the name used in the form above. Since we are actually using the PHP code before the form is created we will place the code above the form.

PHP coding

Let’s start with two functions and one variable.

isset() – function to test if the variable is set [returns true/false].

empty() – function to test if the variable is empty [returns true/false].

$carPrice – variable to store the price of the car.

It seems that isset() and empty() do the same thing but soon I will explain the small but very important difference.

Let’s examine a code snippet.

if (isset ($_POST[‘carPrice’]) && !empty ($_POST[‘carPrice’]))

$carPrice = check_input ($_POST[‘carPrice’]);

other

$carPrice = 0;

isset($_POST[‘carPrice’]) -> If something is posted in the texbox named carPrice (returns true even if an empty box is posted).

empty ($_POST[‘carPrice’]) -> If not in $_POST[‘carPrice’] (returns true the first time the page is loaded).

Combined expressions (please note the ! before the empty function) will be evaluated as:

If something is typed into the text box named carPrice and the box is empty. Variable $carPrice

be set to something, otherwise, set the variable $carPrice to 0.

The same procedure is needed for term and interestRate as well, creating variables $term and $interestRate, but that code will not be repeated here.

Time to do math work.

Next we create a function that takes the three input parameters $totalLoan, $years and $interest. The function returns the cost per month rounded to the whole dollar.

function calculateMonthlyAmortizingCost($totalLoan, $years, $interest )

$tmp = pow((1 + ($interest / 1200)), ($year * 12));

return round(($totalLoan * $tmp) * ($interest / 1200) / ($tmp – 1));

The next step is to use our newly created function and pass our variables as arguments.

$monthlyCost = calculateMonthlyAmortizingCost($carPrice, $term, $interestRate);

And we are done! Almost, we need to print the price on the web page. To do that we will use the echo function which outputs the text on the web page.

echo($monthlyCost)

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