How to use PHP to implement the shake function in WeChat mini program

With the popularity of WeChat mini programs, more and more developers are beginning to learn about the shake function in WeChat mini programs. So how to use PHP to implement the shake function in WeChat applet? This article will detail how to implement this feature.

1. The implementation principle of the shake function

The shake function in the WeChat applet is mainly implemented by calling the API provided by WeChat. The specific implementation steps are as follows:

1. Register the shake event and set the threshold.
2. When the user shakes the phone, the built-in sensor of the phone detects the shaking event and sends relevant information about the event to the WeChat server.
3. After the WeChat server receives the event information sent by the sensor, it pushes the event information to the mini program back-end server.
4. The mini program back-end server processes the pushed event information, generates corresponding messages, and returns them to the WeChat server.
5. The WeChat server pushes the generated message to the mini program front end, and the user can see the pushed message.

2. Specific steps to use PHP to implement the shake function in the WeChat mini program

1. Create the shake event processing interface of the mini program

In PHP, we can use the curl function to simulate HTTP requests and call the API interface provided by WeChat. The following is the code to create the shake event processing interface of the mini program:

<?php
header("Content-type:text/html;Charset=utf-8");
define("TOKEN","yourToken"); //将yourToken改为你的令牌
$length = isset($_GET['length']) ? intval($_GET['length']) : 15;//设置摇一摇阈值，可以根据需要进行修改
$randNum = mt_rand(1,100);//生成一个随机数
if($randNum > 50)
{
    $postUrl = "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=".$access_token;//访问接口的URL
    $postData=array("touser"=>$openid,"msgtype"=>"text","text"=>array("content"=>"您摇到了".$randNum."，恭喜您获得了一等奖！"));//生成返回给前端的消息
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$postUrl);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS,urlencode(json_encode($postData)));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $result = curl_exec($ch);//调用接口
    curl_close($ch);
    echo "success";
}else{
    echo "fail";
}
?>

In the code, a constant TOKEN is first defined, which is the token of the mini program and needs to be replaced with the corresponding value. The $length variable is the shake threshold, which is set to the default value of 15 here. $randNum is the generated random number. When the random number is greater than 50, a winning message is returned; otherwise, a non-winning message is returned. $postData is the message body returned to the front end, which includes the content of the message sent to the user.

2. Add shake event listening function

In the mini program, we need to add a shake event listening function. The following is the code to implement the shake event listening function:

wx.onAccelerometerChange(function(res){
    if(Math.abs(res.x) > threshold || Math.abs(res.y) > threshold || Math.abs(res.z) > threshold){
        wx.request({
            url:'http://yourDomain/shake.php',//将yourDomain改为你的域名
            data:{
                length:threshold
            },
            success:function(res){
                if(res.data == "success"){
                    wx.showToast({
                        title: '恭喜您中奖了！',
                        icon: 'success',
                        duration: 2000
                    })  
                }else{
                    wx.showToast({
                        title: '很遗憾，您没有中奖。',
                        icon: 'none',
                        duration: 2000
                    })  
                }
            }
        })
    }
})

In the code, we use the wx.onAccelerometerChange() method to register a shake event listening function. When the user shakes the phone, the function will is automatically called. threshold is the shake threshold, which should be consistent with the value set by the server. If the user shakes the phone, a request will be sent to the server. After the server processes it, the processing result will be returned to the mini program front-end.

Summary

Through the above steps, we successfully implemented the shake function in the WeChat mini program. During the development process, it should be noted that we need to apply for the corresponding permissions in the mini program management background and configure the token of the mini program. Finally, readers are welcome to try to implement this function by themselves. Through continuous practice and practice, they can not only gain an in-depth understanding of the development of WeChat mini programs, but also improve their programming skills.

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