[OciXCrom]

There is no method to directly block class selection in the menu in ZP 4.3. This must be done before the class is applied.

public zp_user_infected_pre(id) 
{
    if(zp_get_user_next_class(id) == g_ZombieClassID)
    { 
        if(crxranks_get_user_level(id) < zombieclass_unlock_level)
        { 
            zp_set_user_zombie_class(id, 0) 
            client_print(id, print_chat, "* You must reach level %i in order to use this class!", zombieclass_unlock_level)
        }
    }
}