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<?php
// include code from https://gist.github.com/niraj-shah/ab1c74ad83df172e6075
 
// generate login url with scope, each permission as element in array
$loginUrl = $helper->getLoginUrl( array( 'email', 'user_friends' ) );
 
// output login link
echo '<a href="' . $loginUrl . '">Login</a>';