Smart Invoice Numbering

I wanted to output my invoice numbers into this form: 000022, 000023, etc… I decided to do this with a Smarty plugin, so that I wouldn't have to change any of the core code, only my invoice templates.

Upload the PHP file function.invoice_number.php inside the plug-in folder: /simpleinvoices/include/smarty_plugins/ to enable the plugin for all Simple Invoices' template files (all templates inside /simpleinvoices/templates/default).

You're not ready yet. The invoice templates (/templates/invoices/) won't load the plug-in. So, you also need to upload the file function.invoice_number.php into this folder: /templates/invoices/{yourinvoicetemplate}/plugins/.

Now the plug-in is automatically loaded and usable.

You can download the zip file here.
- or refer the below Code section

In most templates, the invoice number is printed with this code:

{$invoice.id}

Change it to this form:

{invoice_number invoiceId=$invoice.id}

This will invoke the Smarty function that adds the 0's, so that the invoice number is exactly 0 characters long, eg: 000022.

If you want to specify the length of your invoice number (default is 6), you can easily change this. Just add the parameter length=8, or any other length, to the smarty code. For example:

{invoiceNumber invoiceId=$invoice.id length=8}

This code is donated to the Simple Invoices community and is therefor part of the Simple Invoices project and freely usable (philosophy).

The original author is Gelderblom Webdesign, a Dutch webdesign company.

File: function.invoice_number.php

<?php
/**
 * Smarty plugin
 * @package Smarty
 * @subpackage plugins
 * @author Gelderblom Webdesign, www.gelderblomwebdesign.nl
 */
 
/**
 * Invoice number plugin
 * 
 * @param mixed $params Array with 'invoiceId' and 'length'. Length will be defaulted to 6, if not set.
 * @param Object $smarty
 * @example {invoiceNumber invoiceId=$invoice.id length=8}
 */
function smarty_function_invoice_number($params, &$smarty)
{
	if(empty($params['length']))
	{
		$params['length'] = 6;
	}
	$comp = $params['length'] - strlen($params['invoiceId']);
	for($i = 1; $i <= $comp; $i++) echo '0';
	echo $params['invoiceId'];
}
?>