Conditional Logic for Email Templates

I want to share my solution to make the use of template conditional.

In my use case I needed a different header image for each newsletter. And I want all the other mails sent by wordpress or plugins to use the configured settings of “Email Templates” plugin.

I copied the plugins template folder into my theme, put this in functions.php:

add_filter('mailtpl/customizer_template', 'custom_mail_template');
function custom_mail_template() {
  return get_stylesheet_directory() . "/mail-templates/default.php";
};

In default.php I can get $_POST variable to find out, if the email is a newsletter and load different templates.

$settings = Mailtpl::opts();
$args = $_POST;
if ( ! isset( $_POST ) ) {
  $type = 'default';
} elseif ( ! isset( $_POST["es_templ_heading"] ) ) {
  $type = 'admin';
} else {
  $type = 'newsletter';
  $newsletter_id = $_POST["es_templ_heading"];
  $settings['newsletter_id'] = (int)$newsletter_id;
}

if ( $type == 'newsletter' ) {
  include_once( 'partials/header_newsletter.php' );
} else {
  include_once( 'partials/header.php' );
}
include_once( 'partials/email-content.php');
include_once( 'partials/footer.php' );

I get the post id from “es_templ_heading” and put that in $settings, to be able to load the newsletter header from a custom field in newsletter post.

Maybe this solution can help others… and thanks for the plugin!

Krabbe