/**
* Gets the filename identifier for the given error code.
* Used when handling responses under error conditions.
*
* @param int $statusCode A HTTP Statuscode, typically 404 or 500
* @param ErrorPage $instance Optional instance to use for name generation
* @return string
*/
protected static function get_error_filename($statusCode, $instance = null)
{
if (!$instance) {
$instance = ErrorPage::singleton();
}
// Allow modules to extend this filename (e.g. for multi-domain, translatable)
$name = "error-{$statusCode}.html";
$instance->extend('updateErrorFilename', $name, $statusCode);
return $name;
}