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I am wondering when I am importing posts from my old site into my new website, which has already some posts in it. Do the imported posts get a new ID or do they overrule the existing posts ID's?

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I can confirm that the imported post will get a new unique ID if (and only if) there already is an existing/conflicting ID in the target database.

Given a post to be imported with an ID of 7579 (represented in the WXR export file as <wp:post_id>7579</wp:post_id>) and an existing post with that exact same ID already in the target database, the generated ID for the imported post was 7583.

(As far why 7583? I would have thought auto increment but 7579 was an existing post, 7580 a revision of that post and 7581 a draft of some sort. So not exactly sure why 7582 was skipped.)

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  • Does it handles posts IDs in wp_term_relationships table?. We may lose that relationship between posts and terms.
    – Nabil Lemsieh
    Mar 14, 2018 at 14:32
  • From my experience posts are OK with relationships. But attachments collide.
    – Michael Rogers
    Jun 10, 2020 at 23:51
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The imported posts will get a new ID.

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  • Please add an explanation to your answer. How do you know that?
    – fuxia ♦
    Aug 19, 2014 at 15:41
  • I exported my database to give it a try and in the generated .sql file I have INSERT INTO wp_posts VALUES (1900,2,'2014-08-18 17:10:21' etc. where 1900 is the ID of the post. So I'm not entirely sure that a new ID is assigned if you import back when post or page with ID 1900 is still in the database. I would do it with codex.wordpress.org/Function_Reference/wp_insert_post if the database already has data.
    – WPRookie82
    Aug 19, 2014 at 16:43

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