I am currently using WP Gridbuilder to filter my data stored in Meta Box Custom Fields (Woocommerce products).
One of the fields contains a string with many different type names, each separated by a comma.
Mercedes-Benz A220, BMW X6, VW Nutzfahrzeuge
I now need to filter all products by the individual vehicle models. For this I need the Meta Box Custom Field content as a nested array. Unfortunately, I don't seem to be doing this correctly. Where do I have the error and how should it read correctly?
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