In addition to the following php code, I wish to modify this application so it u
ID: 3708022 • Letter: I
Question
In addition to the following php code, I wish to modify this application so it uses a persistent session to save the last values entered by the user for 2 weeks.
<?php
//session will have a cookie of one year
$lifetime = 60 * 60 * 24 * 365;
session_set_cookie_params($lifetime, '/');
session_start();
if (isset($_SESSION['tasklist'])){
$task_list = $_SESSION['tasklist'];
}else{
$task_list = array();
}
$action = filter_input(INPUT_POST, 'action');
$errors = array();
switch( $action ) {
case 'add':
$new_task = filter_input(INPUT_POST, 'newtask');
if (empty($new_task)) {
$errors[] = 'The new task cannot be empty.';
} else {
$task_list[] = $new_task;
}
break;
case 'delete':
$task_index = filter_input(INPUT_POST, 'taskid', FILTER_VALIDATE_INT);
if ($task_index === NULL || $task_index === FALSE) {
$errors[] = 'The task cannot be deleted.';
} else {
unset($task_list[$task_index]);
$task_list = array_values($task_list);
}
break;
}
$_SESSION['tasklist'] = $task_list;
include('task_list.php');
?>
task.
<!DOCTYPE html>
<html>
<head>
<title>Task List Manager</title>
<link rel="stylesheet" type="text/css" href="main.css">
</head>
<body>
<header>
<h1>Task List Manager</h1>
</header>
<main>
<!-- part 1: the errors -->
<?php if (count($errors) > 0) : ?>
<h2>Errors</h2>
<ul>
<?php foreach($errors as $error) : ?>
<li><?php echo $error; ?></li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<!-- part 2: the tasks -->
<h2>Tasks</h2>
<?php if (count($task_list) == 0) : ?>
<p>There are no tasks in the task list.</p>
<?php else: ?>
<ul>
<?php foreach($task_list as $id => $task) : ?>
<li><?php echo $id + 1 . '. ' . $task; ?></li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<br>
<!-- part 3: the add form -->
<h2>Add Task</h2>
<form action="." method="post" >
<input type="hidden" name="action" value="add">
<label>Task:</label>
<input type="text" name="newtask" id="newtask"><br>
<label> </label>
<input type="submit" value="Add Task">
</form>
<br>
<!-- part 4: the delete form -->
<?php if (count($task_list) > 0) : ?>
<h2>Delete Task</h2>
<form action="." method="post" >
<input type="hidden" name="action" value="delete">
<label>Task:</label>
<select name="taskid">
<?php foreach($task_list as $id => $task) : ?>
<option value="<?php echo $id; ?>">
<?php echo $task; ?>
</option>
<?php endforeach; ?>
</select>
<br>
<label> </label>
<input type="submit" value="Delete Task">
</form>
<?php endif; ?>
</main>
</body>
</html>
Explanation / Answer
<?php
//session will have a cookie of one year
$lifetime = 60 * 60 * 24 * 365;
session_set_cookie_params($lifetime, '/');
session_start();
if (isset($_SESSION['tasklist'])){
$task_list = $_SESSION['tasklist'];
}else{
$task_list = array();
}
$action = filter_input(INPUT_POST, 'action');
$errors = array();
switch( $action ) {
case 'add':
$new_task = filter_input(INPUT_POST, 'newtask');
if (empty($new_task)) {
$errors[] = 'The new task cannot be empty.';
} else {
$task_list[] = $new_task;
}
break;
case 'delete':
$task_index = filter_input(INPUT_POST, 'taskid', FILTER_VALIDATE_INT);
if ($task_index === NULL || $task_index === FALSE) {
$errors[] = 'The task cannot be deleted.';
} else {
unset($task_list[$task_index]);
$task_list = array_values($task_list);
}
break;
}
$_SESSION['tasklist'] = $task_list;
include('task_list.php');
?>
task.
<!DOCTYPE html>
<html>
<head>
<title>Task List Manager</title>
<link rel="stylesheet" type="text/css" href="main.css">
</head>
<body>
<header>
<h1>Task List Manager</h1>
</header>
<main>
<!-- part 1: the errors -->
<?php if (count($errors) > 0) : ?>
<h2>Errors</h2>
<ul>
<?php foreach($errors as $error) : ?>
<li><?php echo $error; ?></li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<!-- part 2: the tasks -->
<h2>Tasks</h2>
<?php if (count($task_list) == 0) : ?>
<p>There are no tasks in the task list.</p>
<?php else: ?>
<ul>
<?php foreach($task_list as $id => $task) : ?>
<li><?php echo $id + 1 . '. ' . $task; ?></li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<br>
<!-- part 3: the add form -->
<h2>Add Task</h2>
<form action="." method="post" >
<input type="hidden" name="action" value="add">
<label>Task:</label>
<input type="text" name="newtask" id="newtask"><br>
<label> </label>
<input type="submit" value="Add Task">
</form>
<br>
<!-- part 4: the delete form -->
<?php if (count($task_list) > 0) : ?>
<h2>Delete Task</h2>
<form action="." method="post" >
<input type="hidden" name="action" value="delete">
<label>Task:</label>
<select name="taskid">
<?php foreach($task_list as $id => $task) : ?>
<option value="<?php echo $id; ?>">
<?php echo $task; ?>
</option>
<?php endforeach; ?>
</select>
<br>
<label> </label>
<input type="submit" value="Delete Task">
</form>
<?php endif; ?>
</main>
</body>
</html>
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