WC_Order::get_order_number PHP 메소드

    public function get_order_number()
    {
        return apply_filters('woocommerce_order_number', $this->get_id(), $this);
    }

 /**
  * Generates and saves the invoice to the uploads folder.
  * @param $dest
  * @return string
  */
 public function save($dest)
 {
     if ($this->exists()) {
         die('Invoice already exists. First delete invoice.');
     }
     // If the invoice is manually deleted from dir, delete data from database.
     $this->delete();
     if ($this->template_options['bewpi_invoice_number_type'] === "sequential_number") {
         if (!$this->reset_counter() && !$this->new_year_reset()) {
             $this->number = $this->template_options['bewpi_last_invoice_number'] + 1;
         }
     } else {
         $this->number = $this->order->get_order_number();
     }
     $this->number_of_columns = $this->get_number_of_columns();
     $this->colspan = $this->get_colspan();
     $this->formatted_number = $this->get_formatted_number(true);
     $this->year = date('Y');
     $this->filename = BEWPI_INVOICES_DIR . (string) $this->year . '/' . $this->formatted_number . '.pdf';
     // Template
     $this->css = $this->get_css();
     $this->header = $this->get_header_html();
     $this->body = $this->get_body_html();
     $this->footer = $this->get_footer_html();
     add_post_meta($this->order->id, '_bewpi_invoice_number', $this->number);
     add_post_meta($this->order->id, '_bewpi_invoice_year', $this->year);
     $this->template_options['bewpi_last_invoice_number'] = $this->number;
     $this->template_options['bewpi_last_invoiced_year'] = $this->year;
     delete_option('bewpi_template_settings');
     add_option('bewpi_template_settings', $this->template_options);
     parent::generate($dest, $this);
     return $this->filename;
 }