WP_Query: Small fix for 'post__in' argument showing all results if empty array is passed

[edonramadani]

When an empty array is passed to

$args['posts__in']

it should return no results instead of all posts.
File: wp-includes/class-wp-query.php @line 1956

} elseif ( $q['post__in'] ) {
    if(count($q['posts__in']) > 0){
        $post__in = implode(',', array_map( 'absint', $q['post__in'] ));
    } else {
        $post__in = NULL;
    }
    $where .= " AND {$wpdb->posts}.ID IN ($post__in)";
}

[swissspidy]

Hey there,

Welcome to WordPress Trac! This was previously reported in #28099 and #12212 and it was decided to not change this behaviour because of backward compatibility concerns.

[edonramadani]

Hello there,

Thank you for your reply, and thank you for welcoming me to WordPress Trac!
I did not see the decision to not change this because of backward compatibility concerns, I apologize.