What code do I use to associate a non-aMember page to to aMember

I know with v3, I used code like this:

<?php
$_product_id = range(1, 1256);
require_once '/home/domain/public_html/plugins/protect/php_include/check.inc.php';
?>

That way the user is required to login, and if they are logged in it will pull the data with custom fields I created in aMember.