doHooks(); } return self::$instance; } function __construct() { } private function doHooks(){ add_action('acf/include_field_types', array($this, 'include_field')); // v5 add_action('acf/register_fields', array($this, 'include_field')); // v4 } function include_field($version = false) { if (!$version) $version = 4; include_once('ACF/acf-field-filebird-v' . $version . '.php'); } }