lesson 11 chapter 10

chapter 10 Download

Data tester
<!DOCTYPE html>
<html>
<head>
    <title>Date Tester</title>
    <link rel="stylesheet" href="main.css">
</head>

<body>
    <main>
        <h1>Date Tester</h1>
        <form action="." method="post">
        <input type="hidden" name="action" value="process_data">

        <label>Invoice Date:</label>
        <input type="text" name="invoice_date"
               value="<?php echo htmlspecialchars($invoice_date_s); ?>">
        <br>

        <label>Due Date:</label>
        <input type="text" name="due_date"
               value="<?php echo htmlspecialchars($due_date_s); ?>">
        <br>

        <label>&nbsp;</label>
        <input type="submit" value="Submit">
        <br>

        </form>
        <h2>Message:</h2>
        <?php if ($message != '') : ?>          
            <p><?php echo $message; ?></p>
        <?php else : ?>
        <table>
            <tr>
                <td>Invoice date:</td>
                <td><?php echo $invoice_date_f; ?></td>
            </tr>
            <tr>
                <td>Due date:</td>
                <td><?php echo $due_date_f; ?></td>
            </tr>
            <tr>
                <td>Current date:</td>
                <td><?php echo $current_date_f; ?></td>
            </tr>
            <tr>
                <td>Current time:</td>
                <td><?php echo $current_time_f; ?></td>
            </tr>
            <tr>
                <td>Due date message:</td>
                <td><?php echo $due_date_message; ?></td>
            </tr>
        </table>
        <?php endif; ?>

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

index
<?php
//set default value
$message = '';

//get value from POST array
$action = filter_input(INPUT_POST, 'action');
if ($action === NULL) {
    $action =  'start_app';
}

//process
switch ($action) {
    case 'start_app':

        // set default invoice date 1 month prior to current date
        $interval = new DateInterval('P1M');
        $default_date = new DateTime();
        $default_date->sub($interval);
        $invoice_date_s = $default_date->format('n/j/Y');

        // set default due date 2 months after current date
        $interval = new DateInterval('P2M');
        $default_date = new DateTime();
        $default_date->add($interval);
        $due_date_s = $default_date->format('n/j/Y');

        $message = 'Enter two dates and click on the Submit button.';
        break;
    case 'process_data':
        $invoice_date_s = filter_input(INPUT_POST, 'invoice_date');
        $due_date_s = filter_input(INPUT_POST, 'due_date');

        // make sure the user enters both dates
    if (empty($invoice_date_s) || empty($due_date_s)) {
        $message = 'Please insert both dates';
        break;
    }
        
        
        // and use a try/catch to make sure the dates are valid
        try {// convert date strings to DateTime objects
            $invoice_date_object = new DateTime($invoice_date_s);
            $due_date_object = new DateTime($due_date_s);
        } catch (Exception $e) {
            $message = 'Please make sure dates are in a valid format';
        break;
        }
        // make sure the due date is after the invoice date
        if ($due_date_object < $invoice_date_object ){
            $message = 'The Due Date can not be before the Invoice Date please make sure 
            the correct dates are input';
        break;
        }
        // format both dates
        $invoice_date_f = $invoice_date_object->format('F d,Y');
        $due_date_f = $due_date_object->format('F d,Y');
        
        // get the current date and time and format it
        $current_date_object = new DateTime();
        $current_date_f = $current_date_object->format('F d,Y');
        $current_time_f = $current_date_object->format('g:i:s a');
        
        // get the amount of time between the current date and the due date
        $time_span = $current_date_object->diff($due_date_object);
        // and format the due date message
        if ($due_date_object > $current_date_object){
            $due_date_message = $time_span-> format(' This invoice is due in %y years, %m months, and %d days');
        }else {
            $due_date_message = $time_span-> format('This invoice is %y years, %m months, and %d days overdue');
        }
        break;
};
include 'date_tester.php';
?>

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