items with children

add_shortcode('items_with_children', 'items_with_children_func');
function items_no_child_func(){

$args = array(
    'post_type' => array('subtitle-project'),
    'post_status' => array( 'publish' ),
    'posts_per_page'  => -1,
    'fields'    => 'ids'
 );
$posts = get_posts( $args );
$drama = array();
foreach ($posts as $item){
$drama[] = toolset_get_related_post( $item, 'related-drama', 'parent' );
}
if(!empty($drama)) {
return implode(', ', $drama);
}

}