magento - Cake Php 3.0 how to use OAuth php extenstion -

i trying utilize php extension oauth in cakephp 3 application authentication magento.

the module installed in php when utilize in application gives error.

the code written (i got magento site)

$oauthclient = new oauth($consumerkey, $consumersecret,oauth_sig_method_hmacsha1, $authtype);

the error got

class 'app\controller\oauth' not found

the error simple, new php , don't know much structure

need add

utilize oauth;

php magento cakephp oauth

Five