如何阻止数组自行更新并仅显示最后一个任务

Question

 <h1>Calendar and Task Creator</h1>
    <div class="navigation-text">Click the arrows to switch between months</div>
    <div class="navigation-text">Click the dates to create tasks</div>
    <?php

    $month = isset($_GET['month']) ? $_GET['month'] : date('n');
    $year = isset($_GET['year']) ? $_GET['year'] : date('Y');

    // Links
    $prevMonth = ($month == 1) ? 12 : $month - 1;
    $prevYear = ($month == 1) ? $year - 1 : $year;
    $nextMonth = ($month == 12) ? 1 : $month + 1;
    $nextYear = ($month == 12) ? $year + 1 : $year;

    echo "<div class='navigation'>";
    echo "<a href='index.php?month=$prevMonth&year=$prevYear'>&lt;</a>";
    echo "<span>&nbsp;&nbsp;|&nbsp;&nbsp;</span>";
    echo "<a href='index.php?month=$nextMonth&year=$nextYear'>&gt;</a>";
    echo "</div>";

    // number of days 
    $numDays = cal_days_in_month(CAL_GREGORIAN, $month, $year);
    $firstDay = mktime(0, 0, 0, $month, 1, $year);

    $monthName = date('F', $firstDay);

    //day of the week for the first day of the month
    $dayOfWeek = date('D', $firstDay);

    $daysOfWeek = array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
    $firstDayIndex = array_search($dayOfWeek, $daysOfWeek);


    // Display 
    echo "<h2>$monthName $year</h2>";
    echo "<table>";
    echo "<tr>";
    foreach ($daysOfWeek as $day) {
        echo "<th>$day</th>";
    }
    echo "</tr>";
    echo "<tr>";
    $dayCount = 1;
    for ($i = 0; $i < $firstDayIndex; $i++) {
        echo "<td></td>";
    }
    while ($dayCount <= $numDays) {
        for ($i = $firstDayIndex; $i < 7; $i++) {
            if ($dayCount <= $numDays) {
                echo "<td><a href='form.php?day=$dayCount&month=$month&year=$year'>$dayCount</a></td>";
                $dayCount++;
            } else {
                echo "<td></td>";
            }
        }
        echo "</tr>";
        if ($dayCount <= $numDays) {
            echo "<tr>";
        }
        $firstDayIndex = 0;
    }
    echo "</table>";
// ** Here is where I'm unsure what to do **
    // printing tasks
  $task_name=$_GET['task_name'];
  $day=$_GET['day'];
  $month=$_GET['month'];
  $year=$_GET['year'];
    $tasks = array(
      array(
          'name' => '$task_name', 
          'day' => $day, 
          'month' => $month, 
          'year' => $year
      ),
    );
    
    // Display 
    echo "<h2>Tasks</h2>";
    echo "<table>";
    echo "<tr><th>Task Name</th><th>Date</th></tr>";
    foreach ($tasks as $task) {
        echo "<tr>";
        echo "<td>{$task_name}</td>";
        echo "<td>{$task['day']}/{$task['month']}/{$task['year']}</td>";
        echo "</tr>";
    }
    echo "</table>";
    ?>

问题是当我输入多个表单时，只显示最新的任务。我不确定是否必须将其存储在数据库中，或者是否有其他方法可以做到这一点。

我尝试这样做，如果任务名称与第一个任务名称不同，我会向 $tasks 添加一个新数组，但它仍然只显示第二个任务，因为变量 $task_name 对于两个任务仍然相同。

Answer 1

对于这种情况，理想情况下，您应该使用某种数据库来存储数据或在每次操作后保留数据。

如果您暂时不喜欢将数据存储在数据库中，最好是将数据存储在会话、cookie 或本地存储等客户端存储设施中。

参考下面的代码使用session来实现你所需要的：

<?php
session_start(); // Start or resume a session

$month = isset($_GET['month']) ? $_GET['month'] : date('n');
$year = isset($_GET['year']) ? $_GET['year'] : date('Y');

$prevMonth = ($month == 1) ? 12 : $month - 1;
$prevYear = ($month == 1) ? $year - 1 : $year;
$nextMonth = ($month == 12) ? 1 : $month + 1;
$nextYear = ($month == 12) ? $year + 1 : $year;

echo "<div class='navigation'>";
echo "<a href='index.php?month=$prevMonth&year=$prevYear'>&lt;</a>";
echo "<span>&nbsp;&nbsp;|&nbsp;&nbsp;</span>";
echo "<a href='index.php?month=$nextMonth&year=$nextYear'>&gt;</a>";
echo "</div>";

    
    $numDays = cal_days_in_month(CAL_GREGORIAN, $month, $year);
    $firstDay = mktime(0, 0, 0, $month, 1, $year);
    
    $monthName = date('F', $firstDay);
    
    
    $dayOfWeek = date('D', $firstDay);
    
    $daysOfWeek = array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
    $firstDayIndex = array_search($dayOfWeek, $daysOfWeek);
    
    
     
    echo "<h2>$monthName $year</h2>";
    echo "<table>";
    echo "<tr>";
    foreach ($daysOfWeek as $day) {
        echo "<th>$day</th>";
    }
    echo "</tr>";
    echo "<tr>";
    $dayCount = 1;
    for ($i = 0; $i < $firstDayIndex; $i++) {
        echo "<td></td>";
    }
    while ($dayCount <= $numDays) {
        for ($i = $firstDayIndex; $i < 7; $i++) {
            if ($dayCount <= $numDays) {
                echo "<td><a href='form.php?day=$dayCount&month=$month&year=$year'>$dayCount</a></td>";
                $dayCount++;
            } else {
                echo "<td></td>";
            }
        }
        echo "</tr>";
        if ($dayCount <= $numDays) {
            echo "<tr>";
        }
        $firstDayIndex = 0;
    }
    echo "</table>";
    
    
    if (isset($_GET['task_name'], $_GET['day'], $_GET['month'], $_GET['year'])) {
        $task_name = $_GET['task_name'];
        $day = $_GET['day'];
        $month = $_GET['month'];
        $year = $_GET['year'];
    
        $_SESSION['tasks'][] = array(
            'name' => $task_name,
            'day' => $day,
            'month' => $month,
            'year' => $year
        );
    }
    
    
    echo "<h2>Tasks</h2>";
    echo "<table>";
    echo "<tr><th>Task Name</th><th>Date</th></tr>";
    if (isset($_SESSION['tasks'])) {
        foreach ($_SESSION['tasks'] as $task) {
            echo "<tr>";
            echo "<td>{$task['name']}</td>";
            echo "<td>{$task['day']}/{$task['month']}/{$task['year']}</td>";
            echo "</tr>";
        }
    }
    echo "</table>";
    
?>