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

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

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

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.

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

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/post_submitbox_start