Facebook PHP Messenger Bot - receive two messages - php

Question

I would like to write messenger bot based on this script:
<?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);
}
?>
All works correctly but i receive two responses to variable $message, for example:
Send "Hello";
$message = "Hello";
Receive message: "Hi";
$message = "Hi";
I would like to skip 3 and 4 points and receive only "Hello" message because i have to check if $message is my question or answer. Is it possible?
Greetings

Answer 1

You should skip any read and delivery messages, like this:
if (!empty($input['entry'][0]['messaging'])) {
foreach ($input['entry'][0]['messaging'] as $message) {
// Skipping delivery messages
if (!empty($message['delivery'])) {
continue;
}
// Skipping read messages
if (!empty($message['read'])) {
continue;
}
}
}
Or, you can deselect message_reads & message_deliveries checkboxes in Page Subscription section of your Facebook Page Settings/Webhooks.