PHP 8 Revealed: Use Attributes, the JIT Compiler, Union Types, and More for Web Development​

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2021

G. EngebrethPHP 8 Revealedhttps://doi.org/10.1007/978-1-4842-6818-6_8

8. Mixed Type v2

Gunnard Engebreth¹  

(1)

Madison, WI, USA

 

Version: 0.9

Date: 2020-03-23

Author: Máté Kocsis, Danack

Implementation: https://github.com/php/php-src/pull/5313

Vote: 50 / 11

PHP 7 gave us scalar types, 7.1 brought nullables, objects were introduced in 7.2, and now union types have arrived in 8. Type information for most function parameters, function returns, and class properties can be declared, but there is still the need for a mixed type. Historically, PHP has allowed for type information to be unspecified, which, in the era of hyperspecification in programming, presents itself ...