PHP study notes: WeChat applet and public account development

PHP study notes: WeChat applet and public account development

With the rapid development of the mobile Internet, WeChat has become one of the most widely used social media platforms. . In order to meet the needs of users, WeChat provides two development methods: mini programs and official accounts. This article will introduce how to use PHP language to develop WeChat mini programs and public accounts, and provide some specific code examples.

1. WeChat Mini Program Development

1. Preparation work

First, we need to apply for a Mini Program account on the WeChat public platform and obtain the Mini Program account The AppID and AppSecret of the program. Then, build a PHP development environment locally and ensure that the PHP running environment and related extension libraries are installed.

2. Mini program login

Mini program login is an important function in mini program development. You can use the login API provided by WeChat to implement the user login and registration functions of the mini program. The following is a simple sample code:

<?php
// 获取小程序登录凭证code
$code = $_GET['code'];

// 调用接口，获取session_key和openid
$url = "https://api.weixin.qq.com/sns/jscode2session?appid=YOUR_APPID&secret=YOUR_APP_SECRET&js_code=$code&grant_type=authorization_code";
$response = file_get_contents($url);
$result = json_decode($response, true);

$session_key = $result['session_key'];
$openid = $result['openid'];

// 根据openid查询用户信息，如果不存在则注册新用户
// ...
?>

3. Data operation

Mini programs usually need to interact with the background database for data, and the PHP language can be used to operate the database. The following is a sample code using a MySQL database:

<?php
// 连接数据库
$mysqli = new mysqli('localhost', 'username', 'password', 'dbname');

// 查询数据
$query = "SELECT * FROM users";
$result = $mysqli->query($query);

// 处理查询结果
while ($row = $result->fetch_assoc()) {
    echo $row['name'];
}

// 插入数据
$name = $_POST['name'];
$age = $_POST['age'];
$query = "INSERT INTO users (name, age) VALUES ('$name', '$age')";
$mysqli->query($query);

// 更新数据
$id = $_POST['id'];
$name = $_POST['name'];
$query = "UPDATE users SET name='$name' WHERE id=$id";
$mysqli->query($query);

// 删除数据
$id = $_POST['id'];
$query = "DELETE FROM users WHERE id=$id";
$mysqli->query($query);

// 关闭数据库连接
$mysqli->close();
?>

2. WeChat public account development

1. Preparation work

Similarly, we need to create a WeChat public account The platform applies for a public account and obtains the AppID and AppSecret of the public account. Then, configure the URL and Token in the official account settings for message reception and verification.

2. Receive messages

The public account can receive text messages, picture messages, audio messages, etc. sent by users. The following is a sample code for receiving text messages:

<?php
// 验证消息的合法性
$signature = $_GET['signature'];
$timestamp = $_GET['timestamp'];
$nonce = $_GET['nonce'];
$token = 'YOUR_TOKEN';

$tmpArr = array($token, $timestamp, $nonce);
sort($tmpArr);
$tmpStr = implode('', $tmpArr);
$tmpStr = sha1($tmpStr);

if ($tmpStr == $signature) {
    // 验证成功
    // 处理接收的消息
    $postStr = file_get_contents('php://input');
    $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
    
    $type = $postObj->MsgType;
    switch ($type) {
        case 'text':
            $content = $postObj->Content;
            echo "接收到文本消息：$content";
            break;
        // 其他类型的消息
        // ...
    }
} else {
    // 验证失败
    echo "验证失败";
}
?>

3. Send message

Official accounts can send text messages, picture messages, graphic messages, etc. to users. The following is a sample code for sending text messages:

<?php
// 发送文本消息
$access_token = 'YOUR_ACCESS_TOKEN';
$openid = 'USER_OPENID';
$content = 'Hello, World!';

$url = "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=$access_token";
$data = array(
    'touser' => $openid,
    'msgtype' => 'text',
    'text' => array('content' => $content)
);

$options = array(
    'http' => array(
        'method' => 'POST',
        'header' => 'Content-Type:application/json',
        'content' => json_encode($data)
    )
);

$context = stream_context_create($options);
$response = file_get_contents($url, false, $context);
$result = json_decode($response, true);

if ($result['errcode'] == 0) {
    echo "发送成功";
} else {
    echo "发送失败";
}
?>

The above are some basic operations for developing WeChat applets and public accounts using PHP language. I hope it can be helpful to everyone. Of course, there is still a lot involved in WeChat development, which requires further in-depth study and practice. I wish everyone will go further and further on the road of WeChat development.

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