Using get_terms for custom taxonomy in functions.php

You can add the action on the init itself, just increase the priority of the add_action call. The higher the priority the later the function is called.

add_action('init', 'retrieve_my_terms', 9999);

But my suggestion is that you should do these kind of things as late as possible, preferably just before the first time they are used. There’s an action 'wp_loaded' which gets called after full wordpress has been loaded & ready to start working on the output. That action might work for you.

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