PHP学习笔记：微信小程序与公众号开发

<?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
// ...
?>

<?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();
?>

<?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";
}
?>

<?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";
}
?>