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Illustrate how to check the value of ```post__in``` before it is used to construct a new ```WP_Query``` object.
$my_posts = false;
$my_post_ids = mytheme_get_special_post_ids();
if ( ! empty( $my_post_ids ) ) {
$my_posts = new WP_Query( array(
'post__in' => $my_post_ids,
'post_status' => 'publish',
'posts_per_page' => 10,
'no_found_rows' => true,
) );
if ( $my_posts ) {
// Do something with the posts here.
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