PHP8.1 new features explained pure intersection type

This article is a translation, original address: https://stitcher.io/blog/new-in-php-81#pure-intersection-types-rfc

Pure intersection types (Pure intersection types)

You already know about union types in PHP 8.0, and intersection types are a similar feature. Union types require that the input be one of the given types, and intersection types require that the input be all of the specified types.

The intersection type is especially useful when you are working with a large number of interfaces:

function generateSlug(HasTitle&HasId $post) {
    return strtolower($post->getTitle()) . $post->getId();
}

If you like this programming style, you need to create a new interface Sluggable and implement it in $post, intersection Types get rid of this overhead.

See RFC for details: https://wiki.php.net/rfc/pure-intersection-types

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