Modify the Future Value Application so it uses a persistent session to save the last values entered by the user for 2 weeks. As your starting point, you may use the files you already submitted, or you may begin with a fresh project.

Here is the 2 files that I already did some work on in previous assignments. I am looking just to do what is asked above. This is an assignment from cookies and sessions in PHP. Thank you!

index.php

//set default value of variables for initial page load

if (!isset($investment)) { $investment = ''; }

if (!isset($interest_rate)) { $interest_rate = ''; }

if (!isset($years)) { $years = ''; }

?>

>

Future Value Calculator

Investment Amount:

value="">

Yearly Interest Rate:

value="">

Number of Years:

value="">

Compound Interest Monthly

display_results.php

// get the data from the form

$investment = filter_input(INPUT_POST, 'investment',

FILTER_VALIDATE_FLOAT);

$interest_rate = filter_input(INPUT_POST, 'interest_rate',

FILTER_VALIDATE_FLOAT);

$years = filter_input(INPUT_POST, 'years',

FILTER_VALIDATE_INT);

// validate investment

if ( $investment === NULL || $investment === FALSE ) {

$error_message = 'Investment must be a valid number.'; }

else if ( $investment

$error_message = 'Investment must be greater than zero.'; }

// validate interest rate

else if ( $interest_rate === NULL || $interest_rate === FALSE ) {

$error_message = 'Interest rate must be a valid number.'; }

else if ( $interest_rate

$error_message = 'Interest rate must be greater than zero.'; }

// validate years

else if ( $years === NULL || $years === FALSE ) {

$error_message = 'Number of years must be a valid whole number.'; }

else if ( $years

$error_message = 'Numbr of years must be greater than zero.'; }

// set error message to empty string if no invalid entries

else {

$error_message = ''; }

// if an error message exists, go to the index page

if ($error_message != '') {

include('index.php');

exit();

}

// calculate the future value

$future_value = $investment;

if (isset($_POST["monthly"])) {

//compound monthly

$compounded_monthly="Yes";

$months=$years*12;

$monthly_rate = $interest_rate / 12;

for ($i=1;$i

$future_value =$future_value + ($future_value * $monthly_rate * .01);

}

}

else {

for ($i = 1; $i

$future_value =$future_value + ($future_value * $interest_rate * .01);

}

}

// apply currency and percent formatting

$investment_f = '$'.number_format($investment, 2);

$yearly_rate_f = $interest_rate.'%';

$future_value_f = '$'.number_format($future_value, 2);

$monthly_rate_f=number_format($monthly_rate,2).'%';

?>

Future Value Calculator

Investment Amount:

if (isset($_POST["monthly"])) {

echo "Monthly Interest Rate:";

echo "".$monthly_rate_f." ";

echo" Number of Months:";

echo "".$months." ";

echo" Future Value:";

echo"".$future_value_f." ";

echo"Compound Monthly:".$compounded_monthly."";

} else {

echo "Yearly Interest Rate:";

echo "".$yearly_rate_f." ";

echo" Number of Years:";

echo "".$years." ";

echo" Future Value:";

echo"".$future_value_f." ";

}

?>

Yearly Interest Rate:

Number of Years:

Future Value:

Future Value Calculator Investment Amount Yearly Interest Rate: Nurmlpr of Years Future Value: $1,000.00 5% $1,276.28 This calculation was done on 06/19/17