Highly Performant PHP Sessions with Redis

Highly Performant PHP Sessions with Redis

Highly Performant PHP Sessions with Redis. PHP provides a session handling mechanism. Sessions are off by default, and enabled with the `session_start()` function. You have worked with PHP sessions before you may have noticed performance issues caused by the `session_start()` function.

The web is stateless, but often the apps we build are not. To facilitate state in web apps, PHP provides a session handling mechanism. Sessions are off by default, and enabled with the session_start() function.

Read more about PHP session handling at  https://www.php.net/manual/en/book.session.php

If you have worked with PHP sessions before you may have noticed performance issues caused by the session_start() function. On a small scale your app may be ok, but as you scale up issues will pop up. In particular, if the app makes several ajax calls back to the server during a page load there will see issues. This happens because PHP stores its sessions as files on the drive. During each request, PHP opens the session file for reads and writes. The file is locked during the request. That means if there are three ajax requests to the server, request two and three will be blocked waiting on the request in front of them.

By way of example, let’s assume the web server responds in 300 milliseconds for a single request and we have the initial request with three ajax requests that run asynchronously.

redis performance sessions php

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