Bot vk on php sends greetings 2 times. How to fix?

Question

PHP

There is a code in which if a person enters hello or Hello, then the bot will answer him - Hello!
The trouble is that sometimes the bot sends 2 messages Hello!
Maybe the problem lies in the hosting? (I have it free)
Here is the code itself ->

<?php


$confirmationToken = 'Тут что должен ответить сервер VK';

$token = 'Тут ключ API';


$secretKey = 'Тут секретный ключ';

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


if(strcmp($data->secret, $secretKey) !== 0 && strcmp($data->type, 'confirmation') !== 0)
    return;


switch ($data->type) {
    case 'confirmation':
        echo $confirmationToken;
        break;
case 'message_new': 
    $user_id = $data->object->user_id; 
    $user_info = json_decode(file_get_contents("https://api.vk.com/method/users.get?user_ids={$user_id}&v=5.0")); 
    $user_name = $user_info->response[0]->first_name; 
    $message = $data->object->body; 
    $messages_array = [ 
        'Привет' => "Привет!", 
    ]; 
    foreach($messages_array as $k => $v){ 
        if(strtolower($message) == strtolower($k)){$otwet = $v;}
} 
$request_params = [ 
'message' => $otwet, 
'user_id' => $user_id, 
'access_token' => $token, 
'v' => '5.0' 
]; 
$get_params = http_build_query($request_params); 
file_get_contents('https://api.vk.com/method/messages.send?'. $get_params); 
echo('ok'); 
break; 
return false;

}
?>

Answer 1

most likely, the event model sends you your own message, check the flag that you only respond to incoming messages, if I remember correctly, then after you call the api with the message send, you receive it in events and probably do not correctly process what you receive.