$username = $_POST["username"];
$email = $_POST["email"];
$password = $_POST["password"];

$required = array(
     array('name' => 'User Name', 'value' => $username),
     array('name' => 'Email', 'value' => $email),
     array('name' => 'Password', 'value' => $password)
);

foreach ($required as $recrecord){
     if ($required[$recrecord]["value"] == NULL){
          $error = $error.' You have not inputed your '.$required[$recrecord]["name"].'</br>';
     }
}

if (!$error){
     include($_SERVER["DOCUMENT_ROOT"]."/kotel/config/signups_stage3.php");
}

else{
     print($error);
}