$terms = get_terms( array(

            \'taxonomy\'   => \'category\',
            \'hide_empty\' => false,
        ) );
        $sort  = array();
        //loop to list through all category
        foreach ( $terms as $term ) {
            $id    = $term->ID;
            $name  = $term->name;
            $args  = array(
                \'post_type\' => \'post\',
                \'category\'  => $name,

            );

            $query = new WP_Query( $args );
            $sum   = 0;
            if ($query->have_posts() ):while ($query->have_posts() ):$query->the_post();
                // to add all the values of the custom field

                $sum += get_post_meta( get_the_ID(), \'_postviews \', true );
            endwhile;
                //adds term name and the total sum of all _postviews meta in array the term name as key abnd the sum as its value
                $sort[ $name ] = $sum;
            endif;
            //sort keys based on values HIGH TO LOW


        }
 arsort( $sort );       
 print_r( $sort );

它在你的类别中循环

请告诉我此代码是否适用于你