WordPress at a glance
function is not described

_publish_post_hook() WP 2.3.0

Hook to schedule pings and enclosures when a post is published.

Uses XMLRPC_REQUEST and WP_IMPORTING constants.

This is an internal function for using it by WP core itself. It's not recommended to use this function in your code.

Hooks from the function
Return

````. Null. Nothing.

Usage

_publish_post_hook( $post_id );
$post_id(int) (required)
The ID in the database table of the post being published.

Changelog

Since 2.3.0 Introduced.

Code of _publish_post_hook() WP 5.7

<?php
function _publish_post_hook( $post_id ) {
	if ( defined( 'XMLRPC_REQUEST' ) ) {
		/**
		 * Fires when _publish_post_hook() is called during an XML-RPC request.
		 *
		 * @since 2.1.0
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'xmlrpc_publish_post', $post_id );
	}

	if ( defined( 'WP_IMPORTING' ) ) {
		return;
	}

	if ( get_option( 'default_pingback_flag' ) ) {
		add_post_meta( $post_id, '_pingme', '1', true );
	}
	add_post_meta( $post_id, '_encloseme', '1', true );

	$to_ping = get_to_ping( $post_id );
	if ( ! empty( $to_ping ) ) {
		add_post_meta( $post_id, '_trackbackme', '1' );
	}

	if ( ! wp_next_scheduled( 'do_pings' ) ) {
		wp_schedule_single_event( time(), 'do_pings' );
	}
}