How can I produce multiple webpages with a different output based on one entry/Page/custom Page?

Question

My problem:

I have a custom page format for events. Now I would like to get different outputs for each of these events.

1. Normal webpage › for visitors
2. Custom look › for easy copy and paste to other platforms for seminars.

My question

Is it possible to design two templates with different URLs. So that I have the possibility to call these pages with custom templates/designs?

Answer 1

Query string parameters are a helpful friend in this situation. It will allow you to keep the same single-$posttype.php file for both formats of the page.

So if someone visits your page using the URL:
https://yourwebsite.com/events
They will see your normal webpage for visitors. But if someone uses the URL:
https://yourwebsite.com/events?seminar=true
They will see something completely different.

This is accomplished by using the $_GET global variable provided by PHP. Documentation is here.

So you could do the following using a single-event.php page (providing event is a post type):

<?php
$is_seminar = $_GET['seminar'];

if ( $is_seminar === 'true' ) : ?>
  <h1>Custom look for seminars.</h1>
<?php else : ?>
  <h1>Normal webpage</h1>
<?php endif;

Or if you want a little bit of a cleaner look to your URL, take a look at Get URL query string parameters using $_SERVER['QUERY_STRING']. Also see How can I make different page templates for one category? for another alternative solution using your post's meta info.