我正在使用 Homebrew 来管理它们，并且它们都是最新的。
~ $ brew --version
Homebrew 1.8.4
Homebrew/homebrew-core (git revision a166; last commit 2018-12-08)
~ $ php --version
PHP 7.3.0 (cli) (built: Dec 7 2018 11:00:11) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.0-dev, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.3.0, Copyright (c) 1999-2018, by Zend Technologies
~ $ php-cs-fixer --version
PHP needs to be a minimum version of PHP 5.6.0 and maximum version of PHP 7.2.*.
~ $ brew upgrade php-cs-fixer …