multi-threading in Slim

Hi! I need to use the concept of multi-threading in Slim. how should I do? Is there currently this possibility? Thanks.

PHP is shared nothing by default. Please add more technical details.

Hi! I need to start a process, triggering a post to a REST API that will take time to return while the page remains operable for the user. Much like AJAX behavior.

There are different ways to solve this. It depends on your specific requirements.
How do you start / invoke / trigger the process? Via HTTP, Cronjob etc?