How to implement the date picker in WeChat applet with PHP

With the popularization and use of smart phones, the development of WeChat mini programs has become more and more popular. Among them, the date picker in a mini program is a basic and commonly used function. Today we will discuss how to use PHP to implement a date picker in a mini program.

1. Understand the basic functions of the date picker:

The date picker is a control used to select dates, usually including "year", "month" and "day" The selection bar contains two basic functions:

1. Date picker menu bar presented to the user: This menu bar allows the user to select the desired year, month and day;
2. From the menu bar Calculate some specific information from the selected date: for example, the day of the week of the date, the number of weeks within a certain period of time, etc.

2. Use PHP's date and time processing functions to implement a date picker

Before using PHP to implement a date picker, we need to understand some date and time processing functions. PHP has many built-in date and time processing functions that can easily manipulate dates. The following are some commonly used date processing functions:

1.date(): used to format the timestamp into a more readable date and time
2.time(): returns the Unix time of the current time Stamp
3.mktime(): Returns the Unix timestamp of the specified date
4.strtotime(): Converts any non-date and time string into a Unix timestamp.

On this basis, we can use PHP to develop the date picker in the WeChat applet. The following are the specific steps:

1. Create an operation bar containing "Year", "Month", and "Day" and add buttons;

2. Use JavaScript to implement: When selecting " "Year", "Month", and "Day", submit the data to the background and obtain the new date data return value;

3. Use AJAX or JSON to obtain the year, month, and day data from the server, and use HTML populates the date picker bar.

3. Sample code

The following is a sample code for implementing a date picker using PHP. The specific functions implemented by this code are: click the "Year" button to update the calendar and display it on the page; click the "Month" button to update the month and display it on the page.

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<title>显示当前月份的日历</title>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/jquery/3.4.0/jquery.min.js"></script>
<script type="text/javascript">
    $(document).ready(function () {
        $('#year, #month').on('change', function () {
            var year = $('#year').val();
            var month = $('#month').val();

            $.ajax({
                url: '<?php echo $calendar_path; ?>',
                type: 'post',
                data: {
                    year: year,
                    month: month,
                    calendar: true
                },
                dataType: 'json',
                success: function (response) {
                    console.log(response);

                    if (response.success == true) {
                        $('.calendar-container').html(response.calendar);
                    }
                }
            });
        });
    });
</script>

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<form>
    <select name="year" id="year">
        <?php
        for ($i = date('Y'); $i <= date('Y') + 10; $i++) {
            $selected = ($i == $current_year) ? ' selected="selected" ' : '';
            echo '<option value="' . $i . '" ' . $selected . '>' . $i . '</option>';
        }
        ?>
    </select>

    <select name="month" id="month">
        <?php
        foreach ($month_names as $key => $value) {
            $selected = ($key + 1 == $current_month) ? ' selected="selected" ' : '';
            echo '<option value="' . ($key + 1) . '" ' . $selected . '>' . $value . '</option>';
        }
        ?>
    </select>
</form>

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<?php echo $calendar; ?>

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< ;/html>

Through the above steps, a date picker in a WeChat applet implemented using PHP is completed. When the user clicks the button, new date information will be submitted to the server and new date data will be returned, such as the selected year, month, etc. Through the page "php_calendar.php" of the above sample code, you can use the date picker in the WeChat applet.

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