Hi,
where I can find PHP API for MikroTik v.7.x?
You don’t replaced with:
https://help.mikrotik.com/docs/display/ROS/REST+API
https://web.archive.org/web/20170210102259/http://wiki.mikrotik.com/wiki/API_PHP_class
But I will suggest quite opposite and use REST API with some PHP HTTP client and json_encode() / json_decode() for request / response processing.
Also this link is useful