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CodeIgniter Cache - Naming files and turning md5 off - krystian2160 - 07-12-2017

Page Caching

I heard that
Quote:they are hash md5($uri); of your URI. so its similar to controllername+function name but in a hashed format.

Why codeigniter hashes files named 

Code:
controller_name+function

 with md5? Is it necessary? Or security option? Even if, what does it secure and how?
And main question, Can I turn it off, to have files in cache folder named like 'controller+function' ? And how to achieve it?