Get the email of my friends using Graph API

Is there any possible 开发者_Go百科way from which i can access my friends email using php-sdk? Assuming that I am logged in is it possible to see the same info through a php script .What i want to do is send a gmail invite to all my friends on facebook using graph.facebook.com/$id/ it asks for a access token please help me with it .

1. While login, set the permissions for email also, and you would be able to access the email

   $facebook->api('/FRIEND_ID?fields=email')
   

2. for access token , use -

   $facebook->getAccessToken()