Will there be any concurrency and consistency issues when PHP sessions are stored in redis? Isn't redis writing atomic?

This is my setup:

<code>ini_set(“session.save_handler”,”redis”);
ini_set(“session.save_path”,”tcp://127.0.0.1:6379″);
</code>

Reply content:

This is my setup:

<code>ini_set(“session.save_handler”,”redis”);
ini_set(“session.save_path”,”tcp://127.0.0.1:6379″);
</code>

It really won’t happen, it’s already been said here: PHP writes to redis

---

I researched and found that it still happens, because after reading a key, redis is not locked, so another http request may change the data, and then the original value will be overwritten.