<?
$mysqli = new mysqli ("***", "***", "***", "***");
if(isset($_POST['button'])){
$inn = $_POST('inn');
$fio = $_POST('fio');
$phone = $_POST('phone');
$email = $_POST('email');
}
if($mysqli){
$success = $mysqli->query("INSERT INTO `users` (`INN`, `FIO`, `Phone`, `Email`) VALUES ('$inn', '$fio', '$phone', '$email')");
//echo $success;
}
?>
