/**
* Adds a headline alternative experiment in self::$headline_exps.
*
* @param NelioABHeadlineAlternativeExperiment $exp The Headline Alternative Experiment to be added.
* @param int $alt_index The index of the alternative that this visitor is supposed to see.
*
* @since 4.0.0
*/
private static function add_headline_exp($exp, $alt_index)
{
$alt = $exp->get_original();
if ($alt_index > 0) {
--$alt_index;
$alts = $exp->get_alternatives();
if ($alt_index < count($alts)) {
$alt = $alts[$alt_index];
}
}
self::$headline_exps[$exp->get_originals_id()] = array('exp' => $exp, 'alt' => $alt);
}
