原因：Mac升级到Monterey，移除了自带的php.
可能触发连环升级，过程一定要有耐心。
使用brew安装php
brew install php
有可能报错：
Error: homebrew-core is a shallow clone.
原因：brew需要先升级
brew upgrade
如果报错：
==> Upgrading readline 7.0.5 -> 8.1
==> Downloading https://ftp.gnu.org/gnu/readline/readline-8.1.tar.gz
######################################################################## 100.0%
Error: Your Command Line Tools (CLT) does not support macOS 12.
It is either outdated or was modified.
Please update your Command Line Tools (CLT) or delete it if no updates are available.
Update them from Software Update in System Preferences or run:
softwareupdate --all --install --force
可以用这个方案
sudo rm -rf /Library/Developer/CommandLineTools
sudo xcode-select --install
