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In wp-config.php you're able to change how WordPress deals with post revisions. Specifically you're able to turn them off or specify a max number of revisions.

I'd like to be able to set a max number or revisions on a post type basis.

Is this possible?

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up vote 1 down vote accepted
  1. Remove the action 'wp_save_post_revision' from 'pre_post_update'. It is set per default in wp-includes/default-filters.php with the default priority (10).

  2. Add your own function to this hook. You get the $post_ID as parameter, so detecting the post type is easy.

  3. In your callback copy the code from wp_save_post_revision() but use the constant WP_POST_REVISIONS for the post type post only, and use different values for other post types. Not sure if it is possible to pass extra values in register_post_type()

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This is the winner: gist.github.com/2884090 You do have to roll your own revision meta box, however. The built in one still uses WP_POST_REVISIONS. – chrisguitarguy Jun 6 '12 at 19:24

This is possible but it's not as simple as changing the WP_POST_REVISIONS property in the wp-config.php. This is possible by adding a filter to the 'wp_insert_post_data'.

Adding a filter is done like this:

add_filter('wp_insert_post_data' , 'my_insert_post_data');

function my_insert_post_data($data , $postarr) {
  // Check the revision stuff
  return $data;
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Except wp_insert_post_data does not take care of deleting extra revisions, which is what I want to avoid. – chrisguitarguy Jun 4 '12 at 22:09
Upvoted. @ChristopherDavis Completely understand what you're after. On the other hand, this could be extended to maybe handle it... – kaiser Jun 4 '12 at 23:01

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