boujphoenix on "Display pages by role"

Hi,
thanks in advance for the help and support you are giving.
i am a rea beginner in this area of wordpress and the coding stuff. Iused to find a plugin for everything i need, but not this time.
i am trying to show pages to users by roles. here what i am trying to do:
global $user;
if ( isset( $user->roles ) && is_array( $user->roles ) ) {
switch ($roles)
case subscriber:
wp_list_pages('exclude=23; 34;35;' );
break;
case editor:
wp_list_pages('exclude=34;35' );
break;