WordPress function for redirecting users on login based on user role

WordPress Login Redirect

/**
 * WordPress function for redirecting users on login based on user role
 */
function login_redirect( $url, $request, $user ){
    // Is there a user to check?
    if( !is_wp_error($user) && is_array($user->roles) ){
        // Check for admins
        if( in_array('administrator', $user->roles) )
            return admin_url();
        else
            return $url . '?var=test';
    }
}

add_filter('login_redirect', array($this, 'login_redirect'), 10, 3 );

Thanks... worked beautifully. In my case I wanted subscribers to be redirected the the home_url so I added another function for that that works nicely.
`/**

• WordPress function for redirecting users on login based on user role
  */
  function my_logout_redirect( $url, $request, $user ){
  if( $user && is_object( $user ) && is_a( $user, 'WP_User' ) ) {
  if( $user->has_cap( 'administrator' ) ) {
  $url = admin_url();
  } else {
  $url = home_url('/');
  }
  }
  return $url;
  }

add_filter('logout_redirect', 'my_logout_redirect', 10, 3 );`