Question

In: Computer Science

Enhance the Future Value application Modify this application so it uses a persistent session to save...

Enhance the Future Value application

Modify this application so it uses a persistent session to save the last values entered by the user for 2 weeks..

Index.php

--------------------------

<?php
    //set default value of variables for initial page load
    if (!isset($investment)) { $investment = '10000'; }
    if (!isset($interest_rate)) { $interest_rate = '5'; }
    if (!isset($years)) { $years = '5'; }
?>
<!DOCTYPE html>
<html>
<head>
    <title>Future Value Calculator</title>
    <link rel="stylesheet" type="text/css" href="main.css"/>
</head>

<body>
    <main>
    <h1>Future Value Calculator</h1>
    <?php if (!empty($error_message)) { ?>
        <p class="error"><?php echo $error_message; ?></p>
    <?php } // end if ?>
    <form action="display_results.php" method="post">

        <div id="data">

            <label>Investment Amount:</label>
            <select name="investment">
                <?php for ($i = 10000; $i <= 50000; $i += 5000) : ?>
                    <option value="<?php echo $i; ?>">
                        <?php echo number_format($i); ?></option>
                <?php endfor; ?>
            </select><br>


            <label>Yearly Interest Rate:</label>
            <select name="interest_rate">
                <?php for ($i = 4; $i <= 12; $i += 0.5) : ?>
                    <option value="<?php echo $i; ?>">
                        <?php echo number_format($i, 2); ?></option>
                <?php endfor; ?>
            </select><br>



            <label>Number of Years:</label>
            <input type="text" name="years"
                   value="<?php echo $years; ?>"/><br>


        </div>
        <p><input type="checkbox" name="monthly" value="1" > Compound Interest Monthly<br></p>

        <div id="buttons">
            <label> </label>
            <input type="submit" value="Calculate"/><br>
        </div>

</form>
</main>
</body>
</html>

display_results.php

------------------------

<?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);
    $monthly =filter_input(INPUT_POST, 'monthly',
            FILTER_VALIDATE_INT);

    // validate investment
    if ($investment === FALSE ) {
        $error_message = 'Investment must be a valid number.';
    } else if ( $investment <= 0 ) {
        $error_message = 'Investment must be greater than zero.';
    // validate interest rate
    } else if ( $interest_rate === FALSE ) {
        $error_message = 'Interest rate must be a valid number.';
    } else if ( $interest_rate <= 0 ) {
        $error_message = 'Interest rate must be greater than zero.';
    // validate years
    } else if ( $years === FALSE ) {
        $error_message = 'Years must be a valid whole number.';
    } else if ( $years <= 0 ) {
        $error_message = 'Years must be greater than zero.';
    } else if ( $years > 30 ) {
        $error_message = 'Years must be less than 31.';
    // 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 = $investment;
    if($monthly) {
        $months = 12 * $years;
        for ($i = 1; $i <= $months; $i++) {
            $future_value += $future_value * ($interest_rate/12) *.01;
        }
    } else {
        for ($i = 1; $i <= $years; $i++) {
            $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);

?>
<!DOCTYPE html>
<html>
<head>
    <title>Future Value Calculator</title>
    <link rel="stylesheet" type="text/css" href="main.css"/>
</head>
<body>
    <main>
        <h1>Future Value Calculator</h1>

<label>Investment Amount:</label>
<span><?php echo $investment_f; ?></span><br>

<label>Yearly Interest Rate:</label>
<span><?php echo $yearly_rate_f; ?></span><br>

<label>Number of Years:</label>
<span><?php echo $years; ?></span><br>

        <label>Future Value:</label>
        <span><?php echo $future_value_f; ?></span><br>

        <label>Compound Interest Calculated:</label>
        <span><?php echo ($monthly?'Monthly':'Yearly'); ?></span><br>

</main>
</body>
</html>

Expert Solution

/************************************************************

**************************** index.php*****************

*********************************************************************/

<?php

// start session to maintain continuity of process
session_start();

// Checking last entered value stored in cookie or not which is stored in display_results.php file if yes then storing value in veriable investment, intrest_rate, years
if(isset($_COOKIE['investment']) && isset($_COOKIE['interest_rate']) && isset($_COOKIE['years']))
{
$investment = $_COOKIE['investment'];
$interest_rate = $_COOKIE['interest_rate'];
$years = $_COOKIE['years'];
}

//set default value of variables for initial page load
if (!isset($investment)) { $investment = '10000'; }
if (!isset($interest_rate)) { $interest_rate = '5'; }
if (!isset($years)) { $years = '5'; }
?>
<!DOCTYPE html>
<html>
<head>
<title>Future Value Calculator</title>
<link rel="stylesheet" type="text/css" href="main.css"/>
</head>

<body>
<main>
<h1>Future Value Calculator</h1>
<?php if (!empty($error_message)) { ?>
<p class="error"><?php echo $error_message; ?></p>
<?php } // end if ?>
<form action="display_results.php" method="post">

<div id="data">

<label>Investment Amount:</label>
<select name="investment">
<?php for ($i = 10000; $i <= 50000; $i += 5000) : ?>

<?php if($investment==$i)
{
echo'<option value="'. $i.'" selected>';
}else{
echo'<option value="'. $i.'">';
}
?>
<?php echo number_format($i); ?></option>
<?php endfor; ?>
</select><br>


<label>Yearly Interest Rate:</label>
<select name="interest_rate">
<?php for ($i = 4; $i <= 12; $i += 0.5) : ?>

<?php if($interest_rate==$i)
{
echo'<option value="'. $i.'" selected>';
}else{
echo'<option value="'. $i.'">';
}
?>

<?php echo number_format($i, 2); ?></option>
<?php endfor; ?>
</select><br>



<label>Number of Years:</label>
<input type="text" name="years"
value="<?php echo $years; ?>"/><br>


</div>
<p><input type="checkbox" name="monthly" value="1" > Compound Interest Monthly<br></p>

</form>
</main>
</body>
</html>

/************************************************************

**************************** display_results.php*****************

*********************************************************************/

<?php
// start session to maintain continuity of process
session_start();

// 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);
$monthly =filter_input(INPUT_POST, 'monthly',
FILTER_VALIDATE_INT);

// validate investment
if ($investment === FALSE ) {
$error_message = 'Investment must be a valid number.';
} else if ( $investment <= 0 ) {
$error_message = 'Investment must be greater than zero.';
// validate interest rate
} else if ( $interest_rate === FALSE ) {
$error_message = 'Interest rate must be a valid number.';
} else if ( $interest_rate <= 0 ) {
$error_message = 'Interest rate must be greater than zero.';
// validate years
} else if ( $years === FALSE ) {
$error_message = 'Years must be a valid whole number.';
} else if ( $years <= 0 ) {
$error_message = 'Years must be greater than zero.';
} else if ( $years > 30 ) {
$error_message = 'Years must be less than 31.';
// set error message to empty string if no invalid entries
} else {
$error_message = '';
/***********************************************************
* ************** storing last entered value in cookie ****
* ************** so that it will save for 2 weeks ****
* *********************************************************/
setcookie('investment',$investment,time()+(86400*14),'/');
setcookie('interest_rate',$interest_rate,time()+(86400*14),'/');
setcookie('years',$years,time()+(86400*14),'/');
}

// if an error message exists, go to the index page
if ($error_message != '') {
include('index.php');
exit();
}

// calculate the future value
$future_value = $investment;
if($monthly) {
$months = 12 * $years;
for ($i = 1; $i <= $months; $i++) {
$future_value += $future_value * ($interest_rate/12) *.01;
}
} else {
for ($i = 1; $i <= $years; $i++) {
$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);

?>
<!DOCTYPE html>
<html>
<head>
<title>Future Value Calculator</title>
<link rel="stylesheet" type="text/css" href="main.css"/>
</head>
<body>
<main>
<h1>Future Value Calculator</h1>

<label>Investment Amount:</label>
<span><?php echo $investment_f; ?></span><br>

<label>Yearly Interest Rate:</label>
<span><?php echo $yearly_rate_f; ?></span><br>

<label>Number of Years:</label>
<span><?php echo $years; ?></span><br>

<label>Future Value:</label>
<span><?php echo $future_value_f; ?></span><br>

<label>Compound Interest Calculated:</label>
<span><?php echo ($monthly?'Monthly':'Yearly'); ?></span><br>

</main>
</body>
</html>

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