How to call multiple files over HTTP in PHP without waiting for a response?

Question

PHP

How to send an HTTP request in PHP but not wait for a response?
That is, script1 requests script2, then script3, then scriptN via HTTP, but does not wait for each script to respond, thus getting these scripts to execute in parallel (unless they execute faster than the next HTTP request is sent, of course).
How to implement it?
The fact is that I have free hosting and therefore other methods do not work.

Answer 1

php.net/manual/en/function.curl-multi-exec.php
php.net/manual/en/function.socket-select.php
But in general you are sculpting something "terrible"