WP_CLI\Formatter::show_single_field PHP Method

    private function show_single_field($items, $field)
    {
        $key = null;
        $values = array();
        foreach ($items as $item) {
            $item = (object) $item;
            if (null === $key) {
                $key = $this->find_item_key($item, $field);
            }
            if ('json' == $this->args['format']) {
                $values[] = $item->{$key};
            } else {
                \WP_CLI::print_value($item->{$key}, array('format' => $this->args['format']));
            }
        }
        if ('json' == $this->args['format']) {
            echo json_encode($values);
        }
    }