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First we should create a brand new PHP file: simplecarloancalculator.php. A PHP file is handled by the net server as a traditional HTML file aside from the code written inside a php tag.
We begin off by creating the automobile mortgage calculator HTML kind submitting information again to this net web page.
Automobile value:
Time period:
Rate of interest:
The code above will create a kind containing three textual content bins and a button.
Automobile value: ___ Time period: ___ Rate of interest: ___ [Calculate]
Will be translated to:
When the calculate button is pressed the info within the textual content bins will likely be despatched to the web page named: simplecarloancalculator.php (the web page we’ve got all prepared have loaded in our net browser). Our present web page simplecarloancalculator.php will likely be reloaded and we could have entry to the info entered into the shape in an array named $_POST.
To have the ability to use the info entered into the automobile value textual content field we use $_POST[carPrice], the place carPrice is the title used within the kind above. Since we in actuality are utilizing the PHP code earlier than the shape is created we’ll place the code above the shape.
PHP coding
We are going to begin off with two capabilities and one variable.
isset() – perform to check if variable is about [returns true/false].
empty() – perform to check if the variable is empty [returns true/false].
$carPrice – variable to retailer the automobile value in.
Seems like isset() and empty() are doing just about the identical however I’ll quickly clarify the marginally however crucial distinction.
Allow us to look at a code snippet.
if (isset($_POST[‘carPrice’]) && !empty($_POST[‘carPrice’]))
{
$carPrice = check_input($_POST[‘carPrice’]);
}
else
{
$carPrice = 0;
}
isset($_POST[‘carPrice’]) –> If one thing was posted in texbox named carPrice (will return true even when an empty field was posted).
empty($_POST[‘carPrice’]) –> If nothing is in $_POST[‘carPrice’] (will return true first time the web page is loaded).
Mixed collectively the expressions (please discover the ! earlier than empty perform) will likely be evaluated as:
If one thing was typed within the textual content field named carPrice and the field was not empty. Variable $carPrice
will likely be set to that one thing, in any other case set variable $carPrice to 0.
The identical process will wanted for time period and interestRate as effectively, creating variables $time period and $interestRate, however that code won’t be repeated right here.
Time to do the mathematical work.
We are going to subsequent create a perform taking the three enter parameters $totalLoan, $years and $curiosity. The perform will then return the associated fee per thirty days rounded off to complete {dollars}.
perform calculateMonthlyAmortizingCost($totalLoan, $years, $curiosity )
{
$tmp = pow((1 + ($curiosity / 1200)), ($years * 12));
return spherical(($totalLoan * $tmp) * ($curiosity / 1200) / ($tmp – 1));
}
Subsequent step will likely be utilizing our newly created perform and passing our variables as arguments.
$monthlyCost = calculateMonthlyAmortizingCost($carPrice, $time period, $interestRate);
And we’re executed! Nearly, we have to print the value on the net web page. To try this we’ll use the echo perform that outputs textual content to the net web page.
echo($monthlyCost)
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