do_action( 'post_submitbox_start', WP_Post|null $post )

Fires at the beginning of the publishing actions section of the Publish meta box.

Parameters

$post: (WP_Post|null) WP_Post object for the current post on Edit Post screen, null on Edit Link screen.

Used By
Used By	Description
wp-admin/includes/meta-boxes.php: link_submit_meta_box()	Display link create form fields.
wp-admin/includes/meta-boxes.php: post_submit_meta_box()	Displays post submit form fields.

Changelog
Version	Description
WP-4.9.0	Added the `$post` parameter.
WP-2.7.0	Introduced.