I’m afraid I’m unfamiliar with the meaning of “machine codes” and how they’d apply to a WordPress post custom field. Maybe you can elaborate or share some specifics about what you’re looking to accomplish with using custom fields?
The custom field has a field for the title of the thing and then a field for the machine readable field name, ie: ‘Crazy Name’ and then the corresponding ‘crazy_name’. How do I get those second corresponding field strings so I can do the CSV export thing I need to do from existing custom fields?
If you’re referring to these, then it sounds like you’re looking for the meta_key. So one way to find those is look in the database at the _postmeta table and look at the cells under the meta_key column.
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