Starting from WordPress 4.4, you can use add_term_meta function to store metadata for a term. This is basically a key-value pair information which is stored in wp_termmeta table.
Original Answer(Prior to WP 4.4)
WordPress doesn’t have the option to add extra information to taxonomies. There isn’t any taxonomy_meta table. So, you have two options.
- Create a new custom table and save the extra information(image link) there.
- You can also use
optionstable to store the information.
You can follow this post of as it shows how to implement what you are trying to do: http://en.bainternet.info/wordpress-taxonomies-extra-fields-the-easy-way/
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