Countdown implementation method developed in PHP in WeChat mini program

WeChat mini programs are becoming more and more popular in application development, and PHP language is a scripting language widely used on the server side. This article will introduce how to use PHP to develop a countdown function in WeChat mini programs.

1. Development environment preparation

Before using PHP for development, you need to set up a PHP development environment. It is recommended to use the integrated development environment WAMP, XAMPP, etc., so that PHP, MySQL, Apache and other software can be installed with one click.

2. Implement the countdown function

To count down in the WeChat applet, you need to first determine the start and end time of the countdown, as well as the time interval for each countdown update and other factors. Use PHP on the back end to implement the countdown logic, and use the API of the mini program on the front end to implement it.

(1) Determine the start and end time of the countdown

You can obtain the current time through the PHP function date() to determine the time when the countdown starts; at the same time, determine the end time of the countdown according to the design requirements.

For example, suppose we want to implement a countdown that ends at 0:00 on June 30, 2021:

$start_time = date("Y-m-d H:i:s");//获取当前时间
$end_time = "2021-06-30 00:00:00";//设定倒计时结束时间

(2) Calculate the countdown time

Calculate the countdown time using PHP The strtotime() function and time() function respectively obtain the timestamp of the specified time point, and then calculate the time difference:

$duration = strtotime($end_time) - time();//计算时间差

(3) Format countdown time

Format the time difference into The format of the countdown, such as the format of "days: hours: minutes: seconds":

$day_seconds = 86400;//一天的时间总秒数
$hour_seconds = 3600;//一小时的时间总秒数
$minute_seconds = 60;//一分钟的时间总秒数

$countdown_data = array();//保存倒计时的数据
$countdown_data['day'] = floor($duration / $day_seconds);//计算剩余天数
$countdown_data['hour'] = floor(($duration % $day_seconds) / $hour_seconds);//计算剩余小时数
$countdown_data['minute'] = floor(($duration % $hour_seconds) / $minute_seconds);//计算剩余分钟数
$countdown_data['second'] = floor($duration % $minute_seconds);//计算剩余秒数

(4) Return countdown data

Return the countdown data to the front end as JSON data, for example:

header("Content-Type:application/json;charset=utf-8");
echo json_encode($countdown_data);

At this point, the countdown function of the PHP backend has been implemented.

(5) Front-end implementation

The front-end needs to use the API of the mini program to regularly update the countdown data. You can use the setInterval() function to implement the timer function:

var countdown_data = {};//保存倒计时数据
var update_interval;//更新时间间隔，单位：毫秒

//从后端获取倒计时数据
function getCountdownData() {
  wx.request({
    url: 'http://localhost/countdown.php',//后端PHP脚本的地址
    success: function (res) {
      countdown_data = res.data;
    }
  })
}

//更新倒计时显示
function updateCountdown() {
  var countdown_text = countdown_data['day'] + '天 ' + countdown_data['hour'] + '时 ' + countdown_data['minute'] + '分 ' + countdown_data['second'] + '秒';
  //将倒计时数据更新到界面
  // ...
}

//启动定时器
function startCountdown() {
  getCountdownData();//获取倒计时数据
  updateCountdown();//更新倒计时显示
  update_interval = setInterval(updateCountdown, update_interval);//定时更新倒计时数据
}

//停止倒计时
function stopCountdown() {
  clearInterval(update_interval);//清除定时器
}

At this point, countdown The function has been completed in the WeChat applet.

3. Summary

This article introduces the implementation method of using PHP to develop the countdown function in WeChat applet. As a very commonly used and flexible server-side scripting language, PHP can provide richer functions and interactivity for small program development. At the same time, the use of timers can optimize the user experience of mini programs and improve user satisfaction with mini programs.

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