wp_query_post__in.php

<?php 

function get_items_by_ids( $post_type = 'post', $post_ids = '' ) {

	$items = new WP_Query([
		'post_status'   => 'publish',
		'post_type'     => $post_type,
		'showposts'     => 100,
		'post__in'      => $post_ids,
		'orderby'       => 'post__in',
	]);

	return $items;
}