/** * @param $mode * @param bool $includeCustomFields * * @return array|null */ public static function defaultReturnProperties($mode = 1) { if (!isset(self::$_defaultReturnProperties)) { self::$_defaultReturnProperties = array(); } if (!isset(self::$_defaultReturnProperties[$mode])) { if (empty(self::$_defaultReturnProperties[$mode])) { self::$_defaultReturnProperties[$mode] = array('contact_id_a' => 1, 'contact_id_b' => 1, 'contact_a' => 1, 'contact_b' => 1, 'relationship_type_id' => 1, 'relationship_type' => 1, 'start_date' => 1, 'end_date' => 1, 'is_active' => 1); } } return self::$_defaultReturnProperties[$mode]; }