<?php
if (!isset($_REQUEST)){
    return;
}

$confirmationToken = ''; // Токен подтверждения
$token = ''; // Токен сообщества
$secretKey = ''; // Секретная фраза
$data = json_decode(file_get_contents('php://input'));

if (strcmp($data->secret, $secretKey) !== 0) {
    return;
}

function getBtn($label, $color, $payload = '')
{
    return [
        'action' => [
            'type' => 'text',
            "payload" => json_encode($payload, JSON_UNESCAPED_UNICODE),
            'label' => $label
        ],
        'color' => $color
    ];
}

switch ($data->type)
{
    case 'confirmation':
        die($confirmationToken);
        break;
    case 'message_new':
        $userID = $data->object->from_id;
        $userMsg = $data->object->text;

        if ($userMessage == "Привет")
        {
            $keyboard = [
                'one_time' => false,
                'buttons' => [
                    [
                        getBtn("1", 'negative', '1'),
                        getBtn("2", 'negative', '2'),
                        getBtn("3", 'negative', '3'),

                    ],
                    [
                        getBtn("4", 'negative', '4'),
                        getBtn("5", 'negative', '5'),
                        getBtn("6", 'negative', '6'),
                    ],
                ]
            ];

            $request_params = array
                (
                    'message' => "Привет",
                    'user_id' => $userId,
                    'access_token' => $token,
                    'keyboard' => json_encode($keyboard),
                    'v' => '5.50'
                );

            $get_params = http_build_query($request_params);
            file_get_contents('https://api.vk.com/method/messages.send?' . $get_params);
        }
    echo('ok');
    break;
}