WordPress how to get the total count of posts from specific category

A custom function which will return total post counts from the specified category and its child categories.


function wp_get_cat_postcount($id) {

    $cat = get_category($id);

    $count = (int) $cat->count;

    $taxonomy = 'category';

    $args = array(

      'child_of' => $id,

    );

    $tax_terms = get_terms($taxonomy,$args);

    foreach ($tax_terms as $tax_term) {

        $count +=$tax_term->count;

    }

    return $count;

}