You seem to have an unexpected “https://wordpress.stackexchange.com/” character here …/>%5$s</option> so the “option” tag is: <option … />Collection</option> instad of <option … >Collection</option> I am not sure if this causes a problem but i think it is worth checking :).
Is it possible to link an external stylesheet, exclusively within a specific single post template?
If I understand your question correctly, you need option to select page template in a custom post type. In order to do that you have to take a different approach. In your page-fullwidth.php add template name using the following code: /* Template Name: Full-width layout Template Post Type: l */ get_header(); In theory, the default … Read more
How to display a post(by id) along with css in a page?
The error is self explanatory: PLUGIN_PATH is not defined anywhere. It is not one of WordPress’ default constants (which are listed here, and all start with WP_). In the context of the code you’ve copied, it’s apparent that it was either supposed to be replaced with the path to your plugin (in which case using … Read more
Overriding the template files using a plugin for all themes
Custom post type single page uses the right template in preview mode but shows a different template after being posted
Customizing a new page used for blog posts with Avada theme
Using a SendGrid transactional template with wp_mail
Based on the limited detail of your question something as per the following is a rough gist of what you could do. In your theme functions.php file: <?php function handle_request () { if (isset($_GET[‘custom_id’]) && isset($_GET[‘custom_id_nonce’]) ) { if ( wp_verify_nonce($_GET[‘custom_id_nonce’], ‘custom_id_action’) ) { $id = $_GET[‘custom_id’]; // FIRST // do something with $id // … Read more