我引用了谷歌的一些教程，但它们不起作用，我猜这些方法已经过时了。
例如 https://developerjack.com/blog/2016/installing-php71-with-homebrew/
运行“brew install php@7.1”时出错
macOS Catalina 10.15.4
executed
brew install
brew tap
caskroom/cask
homebrew/bundle
homebrew/cask
homebrew/core
homebrew/services
mongodb/brew
brew -v
Homebrew 2.2.12
Homebrew/homebrew-core (git revision 53ccd; last commit 2020-04-08)
Homebrew/homebrew-cask (git revision 322a2; last commit 2020-04-08)
brew install php@7.1
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
No changes to formulae.
Error: No available formula with the name "php@7.1"
==> Searching for a previously deleted formula (in the last month)...
Warning: homebrew/core is shallow clone. To get complete history run:
git -C "$(brew --repo homebrew/core)" fetch --unshallow
Error: No previously deleted formula found.
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching taps...
==> Searching taps on GitHub...
Error: No formulae found in taps.
最佳答案
截至 2018 年 3 月末，所有 PHP 相关 brew 均由 Homebrew/php 处理。选项卡，但它已被弃用，所以现在我们使用 Homebrew/core 中可用的内容包裹。这应该是一个更好的维护，但不是一个完整的软件包集。
PHP 5.6 , PHP 7.0 , 和 PHP 7.1 已弃用并从 Brew 中删除 because they are out of support , 而它是 不推荐用于生产 ，有正当理由在开发环境中测试这些不受支持的版本。
只记得 PHP 7.2 到 7.4 Brew 官方支持，所以如果你想安装 PHP 5.6 , PHP 7.0 , 或 PHP 7.1 您需要添加此水龙头:
$ brew tap exolnet/homebrew-deprecated
Reference here
关于php - 2020年如何使用brew安装php7.1，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/61100623/