If you are new to CodeIgniter you may be confused as to when you need to use
get_instance and when you don't, it certainly tripped me up when I first came back to CodeIgniter after leaving the PHP community for some time.
Luckily it is pretty simple to remember.
If you are writing code that lives within a controller, a model or a view that is under CodeIgniter's control then you do not need to use
If however you are writing your own custom libraries or something that sits outside of the MVC files then you do need to use it.
So, if you are inside a model you could do something like this;
But if you are in a class you have written yourself then the $this object will not know about the CodeIgniter stuff, so you would do something like this;
$ci=& get_instance(); $ci->load->library("my_cool_library")
=& because we don't want to make a new copy of the CodeIgniter object, we want to use the original one.