Use function in controller AND view

Hi

Ive a function which converts a number to currency value (e.g. 10 -> 10,00 EUR).

So far I have a custom "TextHelper" with that method within (becuase its view related).

The problem is, now I need this (exactly same) method in a controller (for generating a flash message). Of course I could place this as a simple function in bootstrap.php (and use it in both, controller and view), but as far as I remember this is bad practice. Bad practice too is to clone this functionality in a component for DRY reasons.

So whats the best practice for such a case?

Thanks,

Frank

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