如何通过 PHP 显示下个月和上个月

Question

我只是想为此数组添加功能，以便在点击时显示下个月。它目前显示当月的所有天数。

我的代码：

  <?php
      $workdays = array();
      $type = CAL_GREGORIAN;
      $month = date('n'); // Month ID, 1 through to 12.
      $year = date('Y'); // Year in 4 digit 2009 format.
      $day_count = cal_days_in_month($type, $month, $year); // Get the amount of days
      $next_date = date('n', strtotime($month .' +1 month'));
      $prev_date = date('n', strtotime($month .' -1 month'));
      //loop through all days
      for ($i = 1; $i <= $day_count; $i++)
      {
        $date = $year.$month.$i; //format date
        $get_name = date('l', strtotime($date)); //get week day
        $day_name = substr($get_name, 0, 3); // Trim day name to 3 chars
        //if not a weekend add day to array
        if($day_name != 'Sun' && $day_name != 'Sat')
        {
          $workdays[] = $i;
         }
      }
      foreach ($workdays as $workday => $test) {
        echo $test;

     }
   ?>

输出：

3 4 5 6 7 10 11 12  13 14 17 18 19  20  21  24  25  26  27  28

我需要这样的东西：

  <a href="?date=<?=$prev_date;?>">Previous month</a>
    <a href="?date=<?=$next_date;?>">Next month</a>

Answer 1

根据我的理解，您需要显示一些 link 到当前月份的工作日，以及一个 link 到上个月和下个月。

The below code requires PHP5.4 or higher.

以下函数将 return link 秒到一个月中的工作日：

const DATE_FOMAT = 'Y-m-d';
const LINK_SEPARATOR = " | ";

// get the reference date from the Query string so that we can print the calendar for any month
$refDateStr = $_GET['dt'] ?? date(DATE_FOMAT); // this requires PHP 7.1 or above

// this function will return the links to all working days
// in the given month (based on the $refDateStr)
function getDateLinks($refDateStr) {
    try {

        // first we check if the given date is valid or not
        $refDateDt = date_create_from_format(DATE_FOMAT, $refDateStr);

        if (!$refDateDt || $refDateDt->format(DATE_FOMAT) !== $refDateStr) {
            // date is not valid. We cannot proceed with this date
            throw new Exception('Invalid date supplied. Dates should be in ' . DATE_FOMAT .'.');
        }

        // now lets find first and last days of the given month
        // for convenience, the start date is set to the last date of past month
        $startDate = new DateTime($refDateDt->modify('first day of this month')->format(DATE_FOMAT));
        $startDate->sub(new DateInterval("P1D"));

        $endDate = new DateTime($refDateDt->modify('last day of this month')->format(DATE_FOMAT));

        $dateLink = null;
        // lets create the date links
        while ($startDate < $endDate) {
            $startDate->add(new DateInterval("P1D"));
            // exclude weekends... :-)
            if (in_array($startDate->format('D'), ['Sat', 'Sun']))
                continue;
            $dateLink .= getDateLinksFormated($startDate);
        }
        return rtrim($dateLink, LINK_SEPARATOR);
    } catch (Exception $exception) {
        echo $exception->getMessage();
    }
}

让我们决定如何显示日期 links

// This function create the date links
function getDateLinksFormated(DateTime $dt):string 
{
    return sprintf(
        "<a href='?%s'>%s</a>%s",
        $dt->format(DATE_FOMAT),
        $dt->format('d'),
        LINK_SEPARATOR
    );
}

现在是展示日历的时候了！！！

// Link to the past month
echo "<a href='?dt=" . date(DATE_FOMAT, strtotime('-1 month', strtotime($refDateStr))) . "'><< PREV MONTH </a>";

// Link to the next month
echo getDateLinks($refDateStr);

// Link to the next month
echo "<a href='?dt=" . date(DATE_FOMAT, strtotime('+1 month', strtotime($refDateStr))) . "'> NEXT MONTH >></a>";

Read more about PHP DateTime Class here

如何通过 PHP 显示下个月和上个月

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