How to use post_submitbox_start action in WordPress

post_submitbox_start action

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

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

Description

This is action hook , its fires at the beginning of the publishing actions section of the Publish meta box.
Its consists of one parameter, $post_id ,which is belongs to current post on Edit Post screen, or can be null on Edit Link screen.

Parameters

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

Live Example

To run the hook, copy the example below.

// run the action 
  do_action( 'post_submitbox_start', $post )
  

The following example is for adding a hook callback.

// define the post_submitbox_start callback 
function action_post_submitbox_start( $post ) { 
    // make action magic happen here... 
}; 
         
// add the action 
add_action( 'post_submitbox_start', 'action_post_submitbox_start', 10, 0 );  

To remove a hook callback, use the example below.

// remove the action 
remove_action( 'post_submitbox_start', 'action_post_submitbox_start', 10, 0 );