How to update post parent?

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I have an array of image id’s and i want assign them to the specific post:

foreach ($image_ids as  $image_id)
    var_dump(wp_insert_post(array('ID' => $image_id, 'post_parent' => $new_post_id), TRUE));

But there occurs error:

object(WP_Error)#252 (2) {
  ["errors"]=>
  array(1) {
    ["empty_content"]=>
    array(1) {
      [0]=>
      string(38) "Content, title, and excerpt are empty."
    }
  }
  ["error_data"]=>
  array(0) {
  }
}

So is it possible to update the post_parent without updating other data?

2 Answers
2

Use wp_update_post(), not insert.

wp_update_post(
    array(
        'ID' => $image_id, 
        'post_parent' => $new_post_id
    )
);

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