3
/**
 * Fires after meta boxes have been added.
 *
 * Fires once for each of the default meta box contexts: normal, advanced, and side.
 *
 * @since 3.0.0
 *
 * @param string  $post_type Post type of the post.
 * @param string  $context   string  Meta box context.
 * @param WP_Post $post      Post object.
 */
do_action( 'do_meta_boxes', $post_type, 'normal', $post );

I found these in wp-admin/edit-form-advanced.php and I can't figure out purpose of these actions ( checked for add_action( 'do_meta_boxes' ... ) there is no such actions ).

Documentation says

Fires after meta boxes have been added.

Fires once for each of the default meta box contexts: normal, advanced, and side.

But what's purpose is for these action? When should I use these actions?

NOTE: it's not the same as do_meta_boxes() function and has nothing common with it!

  • do_meta_boxes Can be used to manipulate the previously registered meta boxes but before they are echoed. It fires after add_meta_boxes hook. – Ignat B. Sep 8 '15 at 15:37
  • add_meta_boxes can be used to manipulate previosly registred meta boxes to... i.e. that there should be some othere reason why they puted these action.. – Maikal Sep 8 '15 at 15:40
  • Dont get you.. what i'm saying is that add_meta_boxes - registering of metabox do_meta_boxes - displaying metabox – Ignat B. Sep 8 '15 at 15:45
  • do_meta_boxes hook isn't for displaying meta boxes.. do_meta_boxes function is for displaying meta boxes.. if you try to echo something in do_meta_boxes hook it will show an error headers already sent. – Maikal Sep 8 '15 at 15:48
  • Again, do_meta_boxes hook fires when meta box have been added but before echoed. You can test it, for example, to remove the "featured image" meta_box from your editor. function test_callback($page, $context, $post){ remove_meta_box( 'postimagediv', $page, $context ); } add_action( 'do_meta_boxes', 'test_callback', 10,3 ); – Ignat B. Sep 8 '15 at 16:28
0

As explained here:

[The] do_meta_boxes [action] is designed to let people manipulate the registered meta boxes once they are registered but before they are rendered.

So the do_meta_boxes hook is not for doing (that is: displaying) the meta boxes. This is because:

When the do_meta_boxes actions was moved out of do_meta_boxes() it should have had its name changed. add_meta_boxes was added in 3.0 to be the hook that we should have renamed do_meta_boxes to be.

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