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I must override qa_answer_create function in qa-include/app/post-create.php. (or qa_page_q_add_a_submit func. in qa-include/pages/question-sumbit.php)

Is this possible?

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As documented, only functions that begin with the following line can be overridden:

if (qa_to_override(__FUNCTION__))

You can patch the code of other functions, of course, but those changes will be lost when you upgrade Q2A, so you would have to re-apply them after an upgrade.