CMB2::process_fields PHP Method

    public function process_fields()
    {
        $this->pre_process();
        // Remove the show_on properties so saving works
        $this->prop('show_on', array());
        // save field ids of those that are updated
        $this->updated = array();
        foreach ($this->prop('fields') as $field_args) {
            $this->process_field($field_args);
        }
    }