Facebook Messenger bot is not sending message to the sender - php

Question

I was following this Tutorial to create A Facebook Messenger bot using php
Everything is working fine, except sender don't receive my message.
there is my code
<?php
$access_token =""; //Token
$verify_token = ""; //Verify Token
$hub_verify_token = null;
if(isset($_REQUEST['hub_challenge'])) {
$challenge = $_REQUEST['hub_challenge'];
$hub_verify_token = $_REQUEST['hub_verify_token'];
}
if ($hub_verify_token === $verify_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'];
$message_to_reply = "Huh? You are talking to me?";
$url = 'https://graph.facebook.com/v2.6/me/messages?access_token='.$access_token;
//Initiate cURL.
$ch = curl_init($url);
//The JSON data.
$jsonData = '{
"recipient":{
"id":"'.$sender.'"
},
"message":{
"text":"'.$message_to_reply.'"
}
}';
//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'));
//curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));
//Execute the request
if(!empty($input['entry'][0]['messaging'][0]['message'])){
$result = curl_exec($ch);
}
?>
I can receive the message and see it, But the user don't receive back my message.

Answer 1

This is fixed by adding following lines of code before //Execute the request
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
Hope it helps.

Answer 2

$jsonData = '{
"messaging_type": "RESPONSE",
"recipient":{
"id": "' . $sender . '"
},
"message":{
"text": "teste web"
}
}';
$s="";
//Tell cURL that we want to send a POST request.
curl_setopt($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'));
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$ret = curl_exec($ch);