Oh Dear is the all-in-one monitoring tool for your entire website. We monitor uptime, SSL certificates, broken links, scheduled tasks and more. You'll get a notifications for us when something's wrong. All that paired with a developer friendly API and kick-ass documentation. O, and you'll also be able to create a public status page under a minute. Start monitoring using our free trial now.

Union Types vs. Intersection Types

Link – Sep 25th 2018 – medium.com

In an older but still relevant blogpost, Ondřej Mirtes, the author of PHPStan, explains the difference between union types and intersection types.

One of the headlining features of PHPStan 0.9 is the introduction of intersection types. Since this is a very useful feature that helps us understand the code much better, but the terminology is largely unknown and mysterious to the PHP community, I decided to write up and compare these two kinds of compound types.