How to organize the structure of the dynamic filters for site ads?

As will be to organize the structure of dynamic filters/fields for the classifieds site for MySQL?
Maybe there are examples of code implementation or at least the database structure, I'd be grateful.

Example of this is the Mega Filter for opencart
or Do Tamaranga
June 10th 19 at 16:18
1 answer
June 10th 19 at 16:20

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