redis - How does PHP prevent multiple processes from operating the same resource at the same time?

Question

How does PHP prevent multiple processes from operating the same resource at the same time?
For example: flash sale products in the mall? Stock lock? Avoid oversold inventory? What is the principle?

Answer 1

For example, if you have 10 products to be sold in a flash sale, you can create a queue and give flash sales to the first 10 items in the queue, and the subsequent ones will be returned to flash sales and fail~

Answer 2

You can use redis queue

Answer 3

kafka you deserve

Answer 4

redis optimistic lock