Facebook聊天机器人(PHP webhook)发送多个回复

Question

我的Facebook聊天机器人正在工作，但它在我的初始消息之后会发回多条消息。这是我的webhook脚本（我很感激这是一个非常粗糙的工作示例）：

$challenge = $_REQUEST['hub_challenge'];
$verify_token = $_REQUEST['hub_verify_token'];
if ($verify_token === 'MY_VERIFICATION_TOKEN') {
  echo $challenge;
}
$input = json_decode(file_get_contents('php://input'), true);
$sender = $input['entry'][0]['messaging'][0]['sender']['id'];
$message = $input['entry'][0]['messaging'][0]['message']['text'];

//API Url
$url = 'https://graph.facebook.com/v2.6/me/messages?access_token=<my-token>';
//Initiate cURL.
$ch = curl_init($url);
//The JSON data.
$jsonData = '{
    "recipient":{
        "id":"'.$sender.'"
    }, 
    "message":{
        "text":"Hey Lee!"
    }
}';
//Encode the array into JSON.
$jsonDataEncoded = $jsonData;
//Tell cURL that we want to send a POST request.
curl_setopt($ch, CURLOPT_POST, 1);
//Attach our encoded JSON string to the POST fields.
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonDataEncoded);
//Set the content type to application/json
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
//Execute the request
$result = curl_exec($ch);

Answer 1

我认为这是因为您没有验证发送的消息是否为空：

试试这个：

$challenge = $_REQUEST['hub_challenge'];
$verify_token = $_REQUEST['hub_verify_token'];
if ($verify_token === 'MY_VERIFICATION_TOKEN') {
  echo $challenge;
}
$input = json_decode(file_get_contents('php://input'), true);
$sender = $input['entry'][0]['messaging'][0]['sender']['id'];
$message = $input['entry'][0]['messaging'][0]['message']['text'];

//API Url
$url = 'https://graph.facebook.com/v2.6/me/messages?access_token=<my-token>';
//Initiate cURL.
$ch = curl_init($url);
//The JSON data.
$jsonData = '{
    "recipient":{
        "id":"'.$sender.'"
    }, 
    "message":{
        "text":"Hey Lee!"
    }
}';
//Encode the array into JSON.
$jsonDataEncoded = $jsonData;
//Tell cURL that we want to send a POST request.
curl_setopt($ch, CURLOPT_POST, 1);
//Attach our encoded JSON string to the POST fields.
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonDataEncoded);
//Set the content type to application/json
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
//Execute the request
if(!empty($input['entry'][0]['messaging'][0]['message'])){
$result = curl_exec($ch);
}

Answer 2

FB用原始传入消息点击你的webhook url，然后你处理它。然后你向用户发送一个响应，脚本结束。然后，一旦消息被传递给用户，FB就会向webhook url发送一个传递确认。由于您的脚本总是被设置为在任何时候调用时发送"嘿，Lee！"，因此传递回调实际上是在触发另一条要发送的消息，然后又收到另一条传递确认，然后这个过程会自己重复。要解决此问题，请在代码周围放置if语句以发送消息。下面是一个例子。

$challenge = $_REQUEST['hub_challenge'];
$verify_token = $_REQUEST['hub_verify_token'];
if ($verify_token === 'MY_VERIFICATION_TOKEN') {
  echo $challenge;
}
$input = json_decode(file_get_contents('php://input'), true);
$sender = $input['entry'][0]['messaging'][0]['sender']['id'];
$message = $input['entry'][0]['messaging'][0]['message']['text'];
//API Url
$url = 'https://graph.facebook.com/v2.6/me/messages?access_token=<my-token>';
//Initiate cURL.
$ch = curl_init($url);
if($message=="hello")
{
        //The JSON data.
        $jsonData = '{
        "recipient":{
                "id":"'.$sender.'"
        },
        "message":{
                "text":"Hey Lee!"
        }
        }';
}
//Encode the array into JSON.
$jsonDataEncoded = $jsonData;
//Tell cURL that we want to send a POST request.
curl_setopt($ch, CURLOPT_POST, 1);
//Attach our encoded JSON string to the POST fields.
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonDataEncoded);
//Set the content type to application/json
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
//Execute the request
$result = curl_exec($ch);

希望能有所帮助。

Answer 3

尝试了同样的操作，第一个请求保存实际的用户消息，其他请求不保存。如果
$message = $input['entry'][0]['messaging'][0]['message']['text'];不为空：

if ($message){
//send your message here
}