query to update post with featured images from array

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This is pseudo-code answer.

  1. First get the posts you want with get_posts (you can pass the
    post_type as an argument)
  2. Then get the ID of the images you want to set as thumnbail

  3. Now do a loop and try with a query similar to this one:

    “UPDATE wp_postmeta SET meta_value = $image_id WHERE post_id = $post_id AND meta_key = ”_thumbnail_id””

NOTE: To get the $image_id from the array of key you could use array_rand. You are gonna need wpdb to run the query.

Read the docs, and ask a question if you have any doubts.