On Getting Permission for to Access User's Email - php

Question

I am using Google APIs PHP client to to access the Google Drive API.
My problem is that I want to get permission to access user email. However the authenticate screen doesn't show the permission I am seeking. It just display "Application would like to ....Have offline access. But when done from the Google API playground, it correctly displays access to users email prompt.
So I think there is something wrong in my code level while creating authenticate url. Please help me to resolve the issue.
$client = new Google_Client();
$guzzleClient = new \GuzzleHttp\Client(array( 'curl' => array( CURLOPT_SSL_VERIFYPEER => false, ), ));
$client->setHttpClient($guzzleClient);
$client->setAuthConfig($oauth_credentials);
$client->setRedirectUri($redirect_uri);
$client->setAccessType('offline');
$client->setApprovalPrompt('force');
$client->setState($this->uri->segment(3));
$client->addScope("https://www.googleapis.com/auth/drive");

Answer 1

If all you want is the email address of the current authencated user you can simply go though the google drive api.
About.get method Gets information about the user, the user's Drive, and system capabilities.
{
"user": {
"kind": "drive#user",
"displayName": "Linda Lawton",
"photoLink": "xxxx",
"me": true,
"permissionId": "xxxx",
"emailAddress": "xxxx#gmail.com"
}
}
Side note on scope:
Scopes are what tells the user what data you want to access. https://www.googleapis.com/auth/drive basically says you want full access to their Google drive account https://www.googleapis.com/auth/classroom.profile.emails would request access to their email address.
Offline access
'offline' tells the user you want to be able to access their account when they are not using your application. By adding this you will receive a refresh token which you can save and use at anytime to get a new access token to access a users data.