REST API authentication in PHP

I am trying to authenticate using REST APIs, on my PHP backend. However, I am unable to obtain the auth code or access token.

 I've registered my application on https://dev.powerbi.com/apps as a server side web-app, and have selected "Read and Write Datasets" permission on the 

This is my code :

$url= "https://login.windows.net/common/oauth2/authorize" .

                                 "?response_type=code".

                                  "&client_id=<my_client_id>".

                                "&resource=https://analysis.windows.net/powerbi/api".

                                "&redirect_uri=<my_redirect_url>";

$ch=curl_init();

curl_setopt($ch, CURLOPT_URL, $url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

$head=curl_exec($ch);

curl_close($ch);

When I run this code, literally nothing happens. It doesn't redirect to my redirect URI. I would like to know how to get the auth code and access token, and use that to proceed making requests to create datasets.