How to setting Prestashop Invoice Number for PDF without a module?

In default, Prestashop create an invoice PDF filename, invoice number… with format: #IN000001, #IN000002…

if you want change this formatting, you can use either of the ways:

1st way – best

Download & Install Prestashop Invoice & Delivery Slips, Credit Slips Template Builder with Custom Number Pro at here: https://buy-addons.com/store/prestashop/module/prestashop-invoice-template-builder-module.html

Use this module, you can change invoice number, delivery number, credit slip number from backoffice, no need modify any PHP file. Also you can design your PDF template file from Backoffice in this module.

2nd way – Good – Manual Edit PHP file, follow steps below:

In this post, Buy-Addons team will take to help you how to modify, change this format.

Step 1: change Disable all overrides to No

Go to Advanced Parameters > Performance, change Disable all overrides to No

Step 2: Download OrderInvoice.php.txt at here:  OrderInvoice.php.txt

Rename this file to OrderInvoice.php, then upload this file to PRESTASHOP_ROOT\override\classes\order\OrderInvoice.php

Step 3: Open PRESTASHOP_ROOT\override\classes\order\OrderInvoice.php

Modify getInvoiceNumberFormatted() method, Prestashop use value that returned from this function to make Invoice Number.

Example 1: if we change this method to code

public function getInvoiceNumberFormatted($id_lang, $id_shop = null)
{
return ‘INVOICE-HELLO’;
}

All Prestashop Invoice PDF file in your store will have the same Invoice number is INVOICE-HELLO

Example 2: if we change this method to code:

public function getInvoiceNumberFormatted($id_lang, $id_shop = null)
{
return ‘INVOICE-‘.$this->id_order;
}

Invoice PDF number will have formatt: INVOICE-[order_id] as INVOICE-1, INVOICE-2…

Also you can open a PHP Class: PRESTASHOP_ROOT\classes\order\OrderInvoice.php in order to find variables, methods, functions that can use them in PRESTASHOP_ROOT\override\classes\order\OrderInvoice.php

Because PHP class PRESTASHOP_ROOT\override\classes\order\OrderInvoice.php extends from a class PRESTASHOP_ROOT\classes\order\OrderInvoice.php

Go to Prestashop Backoffice > Orders, view an Order Detail and see Invoice number changed:

Step 4: Download file HTMLTemplateInvoice.php_1359.txt at here:  HTMLTemplateInvoice.php_1359.txt

Rename this file to HTMLTemplateInvoice.php, upload this file to: PRESTASHOP_ROOT\override\classes\pdf

Also you can open a PHP Class: PRESTASHOP_ROOT\classes\pdf\HTMLTemplateInvoice.php in order to find variables, methods, functions that can use them in PRESTASHOP_ROOT\override\classes\pdf\HTMLTemplateInvoice.php

Because PHP class PRESTASHOP_ROOT\override\classes\pdf\HTMLTemplateInvoice.php extends from a class PRESTASHOP_ROOT\classes\pdf\HTMLTemplateInvoice.php

Step 5: Go to Prestashop Backoffice > Orders, view an Order Detail and download Invoice PDF, you can see PDF file is changed

PDF filename is changed to new format: