Can a continuously running PHP script load the server?

Question

PHP

It is planned that a certain PHP script will run once and work continuously, in a cycle, according to the following algorithm:
- a request to a third-party server;
- record in the database;
sleep(5);
- request to a third-party server;
- record in the database;
sleep(5);
- etc.
Wouldn't that be a noticeable load on the server?
PS: "cron" is definitely not good.

Answer 1

No.

Answer 2

Provided that it will not flow from memory - no.

Answer 3

The server will not load, but the script will be destroyed in 30 seconds if you do not have your own server))) Yes, and = hosters will definitely be interested.
I can’t even imagine why cron definitely didn’t please. Do you really need a pause accuracy of 5 seconds?)) If 5-15 seconds is enough, then use the trigger on the hit, and form the hit with any page accessibility service, the same uptime robot