Adds a PDF invoice attachment to checkout emails.

pmpro-add-pdf-invoice-attachment.php

<?php
/*
Add a PDF attachement of the invoice to the checkout email. This code gist must be configured...

1) Download the DOMPDF library: https://github.com/dompdf/dompdf
	1.1) Save to wp-content/your-plugin/
2) Download the PHP SVG library: https://github.com/PhenX/php-svg-lib
	2.1) Save to dompdf/lib/
3) Download the PHP FONT library: https://github.com/PhenX/php-font-lib
	3.1) Save to dompdf/lib/

Upon checkout, will create a folder (...wp-content/invoices/[user_name]/ and add a PDF invoice. The content is the exact copy of the email.

*/

use Dompdf\Dompdf;

function my_init()
{
	include( dirname( __file__ ) . 'dompdf/autoload.inc.php' );
	
	global $dompdf;
	
	$dompdf = new Dompdf();

}

add_action('init', 'my_init');

function my_pmpro_email_attachments($attachments, $email)
{
	global $dompdf;
	
	//make sure it's a checkout email (but not the admin one)
	if(strpos($email->template, "checkout_") !== false && strpos($email->template, "admin") === false)
	{
		//make sure attachments is an array
		if(is_array($attachments))
			$attachments = array();
			
		$dompdf->loadHtml($email->body);
		$dompdf->render();
		$output = $dompdf->output();
		
		$user_login = $email->data['user_login'];
		
		$upload_dir = wp_upload_dir();
		$user_dirname = $upload_dir['basedir'].'/invoices/'.$user_login;
		if (!file_exists( $user_dirname ))
		{
			wp_mkdir_p( $user_dirname );
		}
		
		$date = date("Y-m-d");
		
		$path = $user_dirname."/invoice-".$date.".pdf";
		
		file_put_contents($path, $output);
		
		//add our attachment
		$attachments[] = $path;
	}
	
	return $attachments;
}
add_filter('pmpro_email_attachments', 'my_pmpro_email_attachments', 10, 2);

Hi Andrew,
here is the error message:
An error of type E_ERROR was caused in line 21 of the file /customers/0/2/2/fitcoach24.com/httpd.www/wp-content/plugins/pmpro-customizations/pmpro-customizations.php. Error message: Uncaught Error: Class 'Dompdf\Dompdf' not found in /customers/0/2/2/fitcoach24.com/httpd.www/wp-content/plugins/pmpro-customizations/pmpro-customizations.php:21
Stack trace:
#0 /customers/0/2/2/fitcoach24.com/httpd.www/wp-includes/class-wp-hook.php(287): my_init('')
#1 /customers/0/2/2/fitcoach24.com/httpd.www/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#2 /customers/0/2/2/fitcoach24.com/httpd.www/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#3 /customers/0/2/2/fitcoach24.com/httpd.www/wp-settings.php(540): do_action('init')
#4 /customers/0/2/2/fitcoach24.com/httpd.www/wp-config.php(123): require_once('/customers/0/2/...')
#5 /customers/0/2/2/fitcoach24.com/httpd.www/wp-load.php(37): require_once('/customers/0/2/...')
#6 /customers/0/2/2/fitcoach24.com/httpd.www/wp-admin/admin.php(34): require_once('/customers/0/2/...')
#7 /customers/0/2/2/fitcoach24.com/httpd.www/wp-admin/plugins.php(10): require_once('/customers/0/2/...')
#8 {main}
thrown

I tried to update the folder hierarchy according to your code, so now it looks like this:

+wp-content/plugins
| +pmpro-customizations
| | +Dompdf/Dompdf
| | | +php-svg-lib
| | | +php-font-lib
| | | - ..
| | | - ..
| | - pmpro-customizations.php

but still facing a technical issue

@duduslm, I've moved over to building a plugin for this instead. You can grab it off Github if you'd like to test it. I think the path on line 20 should be adjusted a bit further to be:

include( dirname(__file__) . '/dompdf/autoload.inc.php' );

I have updated the code and it should fix the issue now.

Problem with the logo
pmpro-pdf-invoices {{logo_image}}
image not found or type unknown

Hi @dloignon

Sorry to hear about this issue, please can you reach out to https://yoohooplugins.com/support and we'll assist you further.