Login Redirect To Referrer?

I am using the Leaky Paywall Plugin, so I need a way to redirect users back to the post they clicked through to the login page from (a custom redirect set in the plugin will not work, since they could have clicked through from any posts).

I tried the snippet below, which I think would work on the default wp-admin login, but doesn’t work via the UWP Login.

`add_filter(‘login_redirect’, ‘redirect_previous_page’, 10, 1);

function redirect_previous_page( $redirect_to ){
global $user;

$request = $_SERVER[“HTTP_REFERER”];

if ( in_array( $user->roles[0], array( ‘administrator’) ) ) {

return admin_url();

} elseif ( in_array( $user->roles[0], array( ‘subscriber’) ) ) {

return $request;
}

return $redirect_to;
}’

Is there any way to send Subscribers back to the referring page?