<?php
Include "config.php";

if ((!empty($_POST['id'])) && (!empty($_POST['key']))) {

    $_id = $_POST['id'];
    $_key  = $_POST['key'];
    $_photo = $_POST['photo'];
    $_first_name = $_POST['first_name'];
    $_last_name = $_POST['last_name'];

    $real_key = md5($app_id."_".$viewer_id."_".$api_secret);
    if ($_key == $real_key){
        $link = mysql_connect($mysql_host, $mysql_user, $mysql_password)
        or die("Could not connect : " . mysql_error());
        mysql_query('SET NAMES utf8');
        mysql_select_db($my_database) or die("Could not select database");

        $msg = "INSERT INTO e_users (vk_id, vk_key, vk_photo, vk_first_name, vk_last_name)
        VALUES ('$_id', '$_key', '$_photo', '$_first_name', '$_last_name')
        ON DUPLICATE KEY UPDATE visits = visits + 1 , vk_photo = '$_photo', vk_first_name = '$_first_name' , vk_last_name = '$_last_name'";
        mysql_query($msg);
        mysql_close($link);
    }else{
        echo "error_key";
    }
}else{
    echo "error";
}
?>