How to use PHP to implement the calendar function in WeChat applet

As one of the most popular social platforms in today’s mobile Internet era, WeChat mini programs have become the first choice platform for many developers. Among them, the calendar function is often used in various scenarios. This article will implement the calendar function in the WeChat applet through PHP.

1. Calendar function requirements

1. Display the calendar of the current month, including year, month, week, date and other information;
2. To implement date selection, you can select a single Date, you can also select a date;
3. Mark special dates, such as holidays, birthdays, anniversaries, etc.

2. PHP implements calendar function

1. Determine the calendar display date range

The requirement requires the calendar to display the current month, so we need to obtain the year and month of the current date . Then, calculate the number of days in the month and the number of weeks in which the first day is. The code is as follows:

//获取当前日期的年份和月份
$year = isset($_POST['year']) ? $_POST['year'] : date('Y');
$month = isset($_POST['month']) ? $_POST['month'] : date('m');

//计算当月的天数和第一天的星期数
$days = date('t', strtotime($year . '-' . $month . '-01'));
$firstWeekday = date('w', strtotime($year . '-' . $month . '-01'));

Among them, the date function is used to obtain the year and month of the current date, and the strtotime function is used to convert a string into a timestamp. Once you have calculated the number of days in the month and the number of weeks in which the first day is, you can determine the date range displayed by the calendar.

2. Draw the calendar table

After determining the date range of the calendar, we can start to draw the calendar table. The code is as follows:

<table>
  <thead>
    <tr>
      <th>日</th>
      <th>一</th>
      <th>二</th>
      <th>三</th>
      <th>四</th>
      <th>五</th>
      <th>六</th>
    </tr>
  </thead>
  <tbody>
    <?php
      $day = 1;
      $weekday = $firstWeekday;
      $flag = true;
      while ($flag) {
        echo '<tr>';
        for ($i = 0; $i < 7; $i++) {
          if ($day > $days) {
            $flag = false;
            break;
          }
          if ($i < $weekday) {
            echo '<td></td>';
          } else {
            echo '<td>' . $day . '</td>';
            $day++;
          }
        }
        echo '</tr>';
        $weekday = 0;
      }
    ?>
  </tbody>
</table>

This code uses a double-layer loop to draw the calendar table. The outer loop controls the number of rows, and the inner loop controls the number of columns. When all cells of the calendar table are drawn, the calendar within the date range is completed.

3. Implement date selection and special date marking

Selecting dates and marking special dates in the calendar are two key points of the calendar function. In PHP, we can select dates through forms. The code is as follows:

<form method="post">
  <select name="year">
    <?php
      for ($i = 1970; $i < 2100; $i++) {
        echo '<option value="' . $i . '">' . $i . '年</option>';
      }
    ?>
  </select>
  <select name="month">
    <?php
      for ($i = 1; $i <= 12; $i++) {
        echo '<option value="' . str_pad($i, 2, 0, STR_PAD_LEFT) . '">' . $i . '月</option>';
      }
    ?>
  </select>
  <input type="submit" value="查询">
</form>

This code uses two drop-down boxes to select the year and month respectively. After the user completes the selection, it will be submitted to the server for processing.

Mark special dates, which can be achieved using CSS. For example, to mark January 1, 2019 as a special date, the code is as follows:

table td:nth-child(3):before {
  content: '元旦';
  font-size: 14px;
  color: #f00;
}

The above code will insert a pseudo element with the content "New Year's Day" in front of the square on January 1, 2019, and Set font size and color.

3. Summary

Through the above implementation steps, we can quickly and simply implement the calendar function in the WeChat applet. Of course, in practical applications, further optimization and expansion are needed. For example, add click date events, implement calendar page turning function, customize special date styles, etc. I believe that through studying this article, you have already had a preliminary understanding of the calendar function in WeChat applet implemented in PHP. I wish you can be handy in your future development work!

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