如何使用PHP實現公眾號的群發訊息功能

<?php
    // 定义公众号的App ID和App Secret
    $appId = 'your_app_id';
    $appSecret = 'your_app_secret';

    // 定义要发送的消息内容
    $message = 'Hello, World!';

    // 获取AccessToken
    $accessToken = getAccessToken($appId, $appSecret);

    // 构造群发消息的URL
    $url = 'https://api.weixin.qq.com/cgi-bin/message/mass/sendall?access_token=' . $accessToken;

    // 构造消息数据
    $data = array(
        'filter' => array(
            'is_to_all' => true  // 发送给所有用户
        ),
        'text' => array(
            'content' => $message  // 消息内容
        ),
        'msgtype' => 'text'  // 消息类型为文本
    );

    // 发送群发消息
    $result = httpPost($url, json_encode($data));

    // 输出结果
    echo $result;

    // 获取AccessToken
    function getAccessToken($appId, $appSecret) {
        $url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=' . $appId . '&secret=' . $appSecret;
        $result = file_get_contents($url);
        $resultJson = json_decode($result, true);
        return $resultJson['access_token'];
    }

    // 发送HTTP POST请求
    function httpPost($url, $data) {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            'Content-Type: application/json'
        ));
        $result = curl_exec($ch);
        curl_close($ch);
        return $result;
    }
?>