在PHP中实现微信公众号新用户自动欢迎消息发送

$postStr = $GLOBALS["Http_RAW_POST_DATA"];
if (!empty($postStr)){
    $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
    $fromUsername = $postObj->FromUserName;//用户openid
    $toUsername = $postObj->ToUserName;
    $event = $postObj->Event;//事件类型
    $time = time();
    if($event == "subscribe"){
        // 欢迎消息处理逻辑
    }
}

$welcomeMsg = "感谢关注我们的公众号，我们将会为您提供最全面的资讯和最贴心的服务。";

$url = "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=" . $accessToken;
$data = '{
    "touser":"' . $fromUsername . '",
    "msgtype":"text",
    "text":
    {
         "content":"' . $welcomeMsg . '"
    }
}';
$result = postOpenSSL($url, $data);//post请求发送数据，调用定义好的函数postOpenSSL()

$accessTokenUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" . $appId . "&secret=" . $appSecret;
$accessTokenData = httpsRequest($accessTokenUrl);
$accessToken = JSON_decode($accessTokenData, true)["access_token"];

function postOpenSSL($url, $data){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_URL, $url);
    $headerArr = array('Content-Type: application/json', 'Content-Length: ' . strlen($data));
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headerArr);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
}