Get Posts From A Certain Post Type In An ID Array

Question

I have some post ids in an ID array, like:

$ids = array(20,34,65,126) ;

There is many custom post types in my project, these ids are related to different post types, but I dont know which id is related to which post type in that condition. In another word, I need to do something like this:

$posts = my_get_posts(
   'ids' => array(20,34,65,126),
   'post_type' => 'product',
) ;

That function has to be eliminate ids which is not a producy.

How to do this?

Answer 1

I am assuming this-- "That function has to be eliminate ids which is not a producy"-- means "I only want to pull the post associated with the ID if that post is a product". In that case a simple query should do it:

$pqry = new WP_Query(
  array(
    'fields' => 'ids', // if you only want the Post IDs
    'post_type' => 'product',
    'post__in' => array(20,34,65,126)
  )
);

Reference:

http://codex.wordpress.org/Class_Reference/WP_Query