This resolves a few WPCS warnings:
{{{
Variable "$cat_ID" is not in valid snake_case format, try "$cat_i_d"
}}}
Follow-up to [2695], [4490], [52958].
Props hilayt24, viralsampat, desrosj, robinwpdeveloper, tanazmasaba, costdev, SergeyBiryukov.
See #56754.
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