Where to format numbers in CodeIgniter?

Question

Should I format my numbers 1234.20 => 1'234.20 in model or in the view using php and codeigniter?

Answer 1

It belongs to the view layer.
The model only cares about the value, not how you present it to the user. Also, you may need to display it differently, if your site is multilingual.

Answer 2

In the view, since the transformation is presentational in nature.