How to set meta_query if get_post_meta returns nested array for that key? [duplicate]

You have miss the last parameter from get_post_meta().

Try below code:

$literature = get_post_meta(get_the_ID(), 'popis_literature', true);

It gives you array of IDs. E.g.

array (size=2) 0 => string '32985' (length=5) 1 => string '59956' (length=5)

So in query you can use them like:

$args = array( 'post_status' => 'published', 'posts_per_page' => -1, 'post_type' => 'post', 'meta_query' => array( array( 'key' => 'popis_literature', 'value' => $literature, 'compare' => 'IN' ) ), );

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