所以这是来自一本非常糟糕的 PHP 书。它假定您已经知道如何使用 PHP,并针对它提出的问题给出了完全不适用的示例。我需要将任务保存到一个数组中,这样当页面打开备份时,它会显示您之前所做的任务。除了极其简单和极其困难之外,Web 几乎没有任何 PHP 示例。
<?php
$lifetime = 60 * 60 * 24 * 365 ;
session_set_cookie_params($lifetime, "/");
session_start();
if (empty($_SESSION['tasks'])) $_SESSION['tasks'] = array();
if (isset($_POST['tasklist'])) {
$task_list = $_POST['tasklist'];
} else {
$task_list = array();
}
$errors = array();
switch( $_POST['action'] ) {
case 'add':
$new_task = $_POST['newtask'];
if (empty($new_task)) {
$errors[] = 'The new task cannot be empty.';
} else {
$task_list[] = $new_task;
}
break;
case 'delete':
$task_index = $_POST['taskid'];
unset($task_list[$task_index]);
$task_list = array_values($task_list);
break;
}
任务列表.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Task List Manager</title>
<link rel="stylesheet" type="text/css" href="main.css"/>
</head>
<body>
<div id="page">
<div id="header">
<h1>Task List Manager</h1>
</div>
<div id="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 . '. ' . $task; ?></li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<br />
<!-- part 3: the add form -->
<h2>Add Task</h2>
<form action="." method="post" >
<?php foreach($task_list as $task) : ?>
<input type="hidden" name="tasklist[]" value="<?php echo $task; ?>"/>
<?php endforeach; ?>
<input type="hidden" name="action" value="add"/>
<label>Task:</label>
<input type="text" name="newtask" id="newtask" /> <br />
<label> </label>
<input type="submit" value="Add Task"/>
</form>
<br />
<!-- part 4: the delete form -->
<?php if (count($task_list) > 0) : ?>
<h2>Delete Task</h2>
<form action="." method="post" >
<?php foreach($task_list as $task) : ?>
<input type="hidden" name="tasklist[]" value="<?php echo $task; ?>"/>
<?php endforeach; ?>
<input type="hidden" name="action" value="delete"/>
<label>Task:</label>
<select name="taskid">
<?php foreach($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; ?>
</div><!-- end main -->
</div><!-- end page -->
</body>
</html>