While WordPress is a Content Management System that is used for creating lighter websites, CodeIgniter is core PHP framework preferred for developing extensive web applications.
It is an open source framework and is mainly preferred for designing small and medium scale websites and applications.
Suited for Java-script driven applications, it is also useful for designing PHP based apps as well.
Also, it can easily be configured and managed in order to meet specific web development requirements.
Accordingly you can check the problem with the code and rectify it easily
WordPress is an open source free content management system that provides the facility of creating and designing attractive websites for businesses and blogging.
PHP CodeIgniter developers can hassle freely migrate specific website from one server to another on the web.