Prefix & Invoice Number in DB

Hi there,
You can do this by filtering the invoice number. Place this code in your theme’s functions.php:

add_filter( 'wpo_wcpdf_invoice_number', 'wpo_wcpdf_invoice_number', 999, 4 );
function wpo_wcpdf_invoice_number( $invoice_number, $order_number, $order_id, $order_date ) {
	$template_settings = get_option('wpo_wcpdf_template_settings');

	// get format settings
	$formats['prefix'] = isset($template_settings['invoice_number_formatting_prefix'])?$template_settings['invoice_number_formatting_prefix']:'';
	$formats['suffix'] = isset($template_settings['invoice_number_formatting_suffix'])?$template_settings['invoice_number_formatting_suffix']:'';
	$formats['padding'] = isset($template_settings['invoice_number_formatting_padding'])?$template_settings['invoice_number_formatting_padding']:'';

	// Replacements
	$order_year = date_i18n( 'Y', strtotime( $order_date ) );
	$order_month = date_i18n( 'm', strtotime( $order_date ) );
	foreach ($formats as $key => $value) {
		$value = str_replace('[order_year]', $order_year, $value);
		$value = str_replace('[order_month]', $order_month, $value);
		$formats[$key] = $value;
	}

	// check if prefix/suffix in DB
	$invoice_prefix = get_post_meta( $order_id, '_wcpdf_invoice_prefix', true );
	$invoice_suffix = get_post_meta( $order_id, '_wcpdf_invoice_suffix', true );
	if (empty($invoice_prefix)) {
		//store prefix/suffix
		update_post_meta( $order_id, '_wcpdf_invoice_prefix', $formats['prefix'] );
		update_post_meta( $order_id, '_wcpdf_invoice_suffix', $formats['suffix'] );
	} else {
		//use prefix/suffix from db
		$formats['prefix'] = $invoice_prefix;
		$formats['suffix'] = $invoice_suffix;
	}

	// Padding
	if ( ctype_digit( (string)$formats['padding'] ) ) {
		$invoice_number = sprintf('%0'.$formats['padding'].'d', $invoice_number);
	}

	$formatted_invoice_number = $formats['prefix'] . $invoice_number . $formats['suffix'] ;

	return $formatted_invoice_number;
}

Ewout

Thanks, this filter works perfectly!
By the way we’ve bought your plugin WooCommerce Print Address Labels https://wpovernight.com/downloads/woocommerce-print-address-labels/
and it’s also great!

That’s great and thanks for the compliment!

Happy selling!
Ewout