public static function wpHead()
{
$features = \Twitter\WordPress\Features::getEnabledFeatures();
// Twitter Cards markup
if (isset($features[\Twitter\WordPress\Features::CARDS])) {
add_action('wp_head', array('\\Twitter\\WordPress\\Head\\CardsMetaElements', 'outputMetaElements'), 99, 0);
}
// page-level customizations referenced by Twitter JavaScript
add_action('wp_head', array('\\Twitter\\WordPress\\Head\\WidgetsMetaElements', 'outputMetaElements'), 11, 0);
if (!is_singular() && !is_author()) {
// attribute authorship to site or site section when a post author does not exist
add_action('wp_head', array('\\Twitter\\WordPress\\Head\\AuthorshipLink', 'relMe'), 10, 0);
}
}