Every two weeks I send out a newsletter containing lots of interesting stuff for the modern PHP developer. You can expect quick tips, links to interesting tutorials, opinions and packages. Want to learn the cool stuff? Then sign up now!

PHP Session Garbage Collection: The unknown performance bottleneck

Here is one performance setting in your PHP configuration you probably haven’t thought about much before: How often does PHP perform random garbage collection of outdated session data in your application? Did you know that because of the shared nothing architecture PHP randomly cleans old session data whenever session_start() is called? An operation that is not necessarily cheap.


Freek Van der Herten is a partner and developer at Spatie, an Antwerp based company that specializes in creating web apps with Laravel. After hours he writes about modern PHP and Laravel on this blog. When not coding he’s probably rehearsing with his kraut rock band.