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Hook – action and filter

  • I’m studying the code of wordpress, but I still can not understand how the hook works.
    I understand the difference between “actions” and “filters”, but sometimes I find it difficult.
    For example, the hook “user_edit_form_tag”. This hook is called one times in the file at line 192 in user_edit.php with
    do_action (‘user_edit_form_tag’).
    This means that there should be a function that is called user_edit_form_tag(), but it’s not, and I don’t understand what code is produced.
    Someone I can do to help?
    Exists a function for each hook type “action”?

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