How to get the absolute path of a css/js file by an area, theme and module?

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1

I have a requirement to change css file dynamically for that I need absolute physical path of css in frontend and adminhtml area.
I want css file path based on area, theme and module in pub/static folder.
Thanks for your time.

2

I think you just use a wrong way of solving the task.

3

Your suggested way seems better, Thank you very much for quick reply.