_publish_post_hook( int $post_id )

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

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

Description

Uses XMLRPC_REQUEST and WP_IMPORTING constants.

Parameters

$post_id

(int) (Required) The ID in the database table of the post being published.

Source

File: wp-includes/post.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' );
	}
}

Uses

Uses Description
wp-includes/cron.php: wp_next_scheduled()

Retrieve the next timestamp for an event.
wp-includes/cron.php: wp_schedule_single_event()

Schedules an event to run only once.
wp-includes/plugin.php: do_action()

Calls the callback functions that have been added to an action hook.
wp-includes/option.php: get_option()

Retrieves an option value based on an option name.
wp-includes/post.php: xmlrpc_publish_post

Fires when _publish_post_hook() is called during an XML-RPC request.
wp-includes/post.php: get_to_ping()

Retrieve URLs that need to be pinged.
wp-includes/post.php: add_post_meta()

Adds a meta field to the given post.

Changelog

Version Description
2.3.0 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/_publish_post_hook