Basic example of a Facebook Messenger Bot

facebook-messenger-bot.php

<?php
// parameters
$hubVerifyToken = 'TOKEN123456abcd';
$accessToken = "xxx";

// check token at setup
if ($_REQUEST['hub_verify_token'] === $hubVerifyToken) {
  echo $_REQUEST['hub_challenge'];
  exit;
}

// handle bot's anwser
$input = json_decode(file_get_contents('php://input'), true);

$senderId = $input['entry'][0]['messaging'][0]['sender']['id'];
$messageText = $input['entry'][0]['messaging'][0]['message']['text'];


$answer = "I don't understand. Ask me 'hi'.";
if($messageText == "hi") {
    $answer = "Hello";
}

$response = [
    'recipient' => [ 'id' => $senderId ],
    'message' => [ 'text' => $answer ]
];
$ch = curl_init('https://graph.facebook.com/v2.6/me/messages?access_token='.$accessToken);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($response));
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
curl_exec($ch);
curl_close($ch);

//based on http://stackoverflow.com/questions/36803518

$response = [
'recipient' => [ 'id' => $senderId ],
'message' => [ 'text' => $answer ]
];

can you please create an attachment format? like mine but

$response = [
'recipient' => [ 'id' => $senderId ],
'message' => ['attachment' =>
'type' => 'image',
'payload' => ['url' => $answer]
]
];

i cant seem to get it to work. i dont know if im doing the code above right.

Is there any possibility of sending 2 messages separately for a single reply by user ??
Example if users Types : Hi
Reply Should be :
Hello
I am fine
Both in separate messages , one followed by another

Hi
Please, I need your help to change a little bit the code.
With the code below, i would like to get 2 different text answers.
When I write "Hi", the bot should answer the 1st answer "Hello" and I'd like it answer too another separate answer. Example "Salut"
How i can code the 2 answers?
if($messageText == "Hi") {
$answer = ["text" => "Hello"];
$response = [
'recipient' => [ 'id' => $senderId ],
'message' => $answer
];
}
Thanks for your help !