Very Simple Facebook Chat Bot PHP Webhook Script Example

webhook.php

<?php
$challenge = $_REQUEST['hub_challenge'];
$verify_token = $_REQUEST['hub_verify_token'];

// Set this Verify Token Value on your Facebook App 
if ($verify_token === 'testtoken') {
  echo $challenge;
}

$input = json_decode(file_get_contents('php://input'), true);

// Get the Senders Graph ID
$sender = $input['entry'][0]['messaging'][0]['sender']['id'];

// Get the returned message
$message = $input['entry'][0]['messaging'][0]['message']['text'];

//API Url and Access Token, generate this token value on your Facebook App Page
$url = 'https://graph.facebook.com/v2.6/me/messages?access_token=<ACCESS-TOKEN-VALUE>';

//Initiate cURL.
$ch = curl_init($url);

//The JSON data.
$jsonData = '{
    "recipient":{
        "id":"' . $sender . '"
    }, 
    "message":{
        "text":"The message you want to return"
    }
}';

//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, $jsonData);

//Set the content type to application/json
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));

//Execute the request but first check if the message is not empty.
if(!empty($input['entry'][0]['messaging'][0]['message'])){
  $result = curl_exec($ch);
}
?>

I want to get the sender name or profile. How to do that?
I am using this,
$sender = $input['entry'][0]['messaging'][0]['sender']['id']; $url = "https://graph.facebook.com/v8.0/$sender?fields=first_name,last_name,profile_pic&access_token=" . $access_token; curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); $result = curl_exec($ch);

But I get the response,

{"error":{"message":"(#33) This object does not exist or does not support this action","type":"OAuthException","code":33,"fbtrace_id":"AiMUy1AR8LoGXvgta0vE2Of"}}

It looks like the $sender is not the actual user ID, How to get the actual user ID to get sender info.

Please help me. This is a roadblock for me.

Please help, dont work for me, I do not receive data from facebook.

update please!