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Union Types vs. Intersection Types

Link – 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.

Read more [medium.com]

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