查看可按照版本：
brew search php
使用brew安装：
brew install php@7.4
但报错： Error: php@7.4 has been disabled because it is a versioned formula! 这是因为php7.4官方已经不再维护，所以Hombrew将该php版本移出了repository，所以安装不了。
解决方案 从第三方仓库中安装 比如(所有旧版php仓库地址https://github.com/shivammath…) //将第三方仓库加入brew brew tap shivammathur/php //安装PHP brew install shivammathur/php/php@7.4
2、替换Mac自带PHP环境并刷新环境变量
Linking /usr/local/Cellar/php@7.4/7.4.29.reinstall... 25 symlinks created.
If you need to have this software first in your PATH instead consider running:
echo 'export PATH="/usr/local/opt/php@7.4/bin:$PATH"' >> ~/.zshrc
echo 'export PATH="/usr/local/opt/php@7.4/sbin:$PATH"' >> ~/.zshrc ```
3、执行配置
echo ‘export PATH=“/usr/local/opt/php@7.4/bin:
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PATH"′>> /.zshrcecho′exportPATH="/usr/local/opt/php@7.4/sbin:PATH”’ >> ~/.zshrc ``
4、刷新环境变量 source ~/.zshrc
5、 输出php版本
PHP 7.4.29 (cli) (built: Apr 14 2022 11:48:33) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies ```
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