php实现一个日历表

实现PHP日历表的方法

使用PHP内置函数生成日历

PHP内置的cal_days_in_month和date函数可以方便地生成日历。以下代码创建一个基本的月历视图：

function generateCalendar($year, $month) {
    $daysInMonth = cal_days_in_month(CAL_GREGORIAN, $month, $year);
    $firstDay = date('N', strtotime("$year-$month-01"));

    echo "<table border='1'>";
    echo "<tr><th>Mon</th><th>Tue</th><th>Wed</th><th>Thu</th><th>Fri</th><th>Sat</th><th>Sun</th></tr>";

    $dayCount = 1;
    echo "<tr>";
    for ($i = 1; $i < $firstDay; $i++) {
        echo "<td></td>";
    }

    for ($i = $firstDay; $i <= 7; $i++) {
        echo "<td>$dayCount</td>";
        $dayCount++;
    }
    echo "</tr>";

    while ($dayCount <= $daysInMonth) {
        echo "<tr>";
        for ($i = 1; $i <= 7 && $dayCount <= $daysInMonth; $i++) {
            echo "<td>$dayCount</td>";
            $dayCount++;
        }
        echo "</tr>";
    }
    echo "</table>";
}

generateCalendar(date('Y'), date('m'));

添加导航功能

扩展日历功能，添加月份和年份导航：

function calendarWithNavigation() {
    $year = isset($_GET['year']) ? $_GET['year'] : date('Y');
    $month = isset($_GET['month']) ? $_GET['month'] : date('m');

    $prevMonth = $month - 1;
    $prevYear = $year;
    if ($prevMonth < 1) {
        $prevMonth = 12;
        $prevYear--;
    }

    $nextMonth = $month + 1;
    $nextYear = $year;
    if ($nextMonth > 12) {
        $nextMonth = 1;
        $nextYear++;
    }

    echo "<div style='text-align:center;'>";
    echo "<a href='?year=$prevYear&month=$prevMonth'>Previous</a> ";
    echo date('F Y', strtotime("$year-$month-01"));
    echo " <a href='?year=$nextYear&month=$nextMonth'>Next</a>";
    echo "</div>";

    generateCalendar($year, $month);
}

calendarWithNavigation();

高亮当前日期

修改日历函数，突出显示当前日期：

function generateCalendarWithHighlight($year, $month) {
    $currentDay = date('j');
    $currentMonth = date('n');
    $currentYear = date('Y');

    $daysInMonth = cal_days_in_month(CAL_GREGORIAN, $month, $year);
    $firstDay = date('N', strtotime("$year-$month-01"));

    echo "<table border='1'>";
    echo "<tr><th>Mon</th><th>Tue</th><th>Wed</th><th>Thu</th><th>Fri</th><th>Sat</th><th>Sun</th></tr>";

    $dayCount = 1;
    echo "<tr>";
    for ($i = 1; $i < $firstDay; $i++) {
        echo "<td></td>";
    }

    for ($i = $firstDay; $i <= 7; $i++) {
        $highlight = ($dayCount == $currentDay && $month == $currentMonth && $year == $currentYear) ? "style='background-color:yellow;'" : "";
        echo "<td $highlight>$dayCount</td>";
        $dayCount++;
    }
    echo "</tr>";

    while ($dayCount <= $daysInMonth) {
        echo "<tr>";
        for ($i = 1; $i <= 7 && $dayCount <= $daysInMonth; $i++) {
            $highlight = ($dayCount == $currentDay && $month == $currentMonth && $year == $currentYear) ? "style='background-color:yellow;'" : "";
            echo "<td $highlight>$dayCount</td>";
            $dayCount++;
        }
        echo "</tr>";
    }
    echo "</table>";
}

使用DateTime类实现

更现代的PHP实现方式，使用DateTime类：

function calendarUsingDateTime($year, $month) {
    $date = new DateTime("$year-$month-01");
    $daysInMonth = $date->format('t');
    $firstDay = $date->format('N');

    echo "<table border='1'>";
    echo "<tr><th>Mon</th><th>Tue</th><th>Wed</th><th>Thu</th><th>Fri</th><th>Sat</th><th>Sun</th></tr>";

    $dayCount = 1;
    echo "<tr>";
    for ($i = 1; $i < $firstDay; $i++) {
        echo "<td></td>";
    }

    for ($i = $firstDay; $i <= 7; $i++) {
        echo "<td>$dayCount</td>";
        $dayCount++;
    }
    echo "</tr>";

    while ($dayCount <= $daysInMonth) {
        echo "<tr>";
        for ($i = 1; $i <= 7 && $dayCount <= $daysInMonth; $i++) {
            echo "<td>$dayCount</td>";
            $dayCount++;
        }
        echo "</tr>";
    }
    echo "</table>";
}

这些方法提供了不同复杂度的PHP日历实现，从基本功能到包含导航和高亮功能的完整日历系统。可以根据项目需求选择适合的实现方式或进行组合使用。