``++include_once++`` and ``++include++`` only generate a warning if an error occurs during the operation. Because of this they should only be used after possible error conditions have been checked.
== Noncompliant Code Example
----
include_once $user.'_history.php'; // Noncompliant
== Compliant Solution
if (is_member($user)) {
include_once $user.'_history.php';
}
