WordPress at a glance
function is not described

wp_after_insert_post() WP 5.6.0

Fires actions after a post, its terms and meta data has been saved.

Hooks from the function
Return

null. Null. Nothing.

Usage

wp_after_insert_post( $post, $update, $post_before );
$post(int|WP_Post) (required)
The post ID or object that has been saved.
$update(true|false) (required)
Whether this is an existing post being updated.
$post_before(null|WP_Post) (required)
Null for new posts, the WP_Post object prior to the update for updated posts.

Changelog

Since 5.6.0 Introduced.

Code of wp_after_insert_post() WP 5.7

<?php
function wp_after_insert_post( $post, $update, $post_before ) {
	$post = get_post( $post );
	if ( ! $post ) {
		return;
	}

	$post_id = $post->ID;

	/**
	 * Fires once a post, its terms and meta data has been saved.
	 *
	 * @since 5.6.0
	 *
	 * @param int          $post_id     Post ID.
	 * @param WP_Post      $post        Post object.
	 * @param bool         $update      Whether this is an existing post being updated.
	 * @param null|WP_Post $post_before Null for new posts, the WP_Post object prior
	 *                                  to the update for updated posts.
	 */
	do_action( 'wp_after_insert_post', $post_id, $post, $update, $post_before );
}