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@nuprn1 Or is this about remove_action and add_action? I found the groups_post_update but I can’t change it with my theme’s functions.php file. Because there’s a problem with filter or action thing…

Actually I don’t know how to replace functions with my_sample_function. For example I want to change something in the plugin’s function. But if I do that in the plugin’s file, I’ll lose changes when I upgrade. So what might be the solution to avoid this?

add_action, add_filter etc… How can I do that?
Thanks.