1、安装PHP
brew install php@7.4
brew install php@5.6
2、安装PHP旧版
提示错误
Error: No available formula with the name "php@5.6"
==> Searching for a previously deleted formula (in the last month)...
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.
试图搜索php相关信息的话，也无法找到php@5.6的字样
brew search php
tap一下
brew tap exolnet/homebrew-deprecated
再次安装
经过tap后，brew就可以识别出php@5.6了。
brew install php@5.6
brew install php@5.6 -vvv
brew reinstall --build-from-source php@5.6
安装PHP5.6出现如下错误：
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make: *** [ext/openssl/openssl.lo] Error 1
make: *** Waiting for unfinished jobs....
If reporting this issue please do so to (not Homebrew/brew or Homebrew/core):
exolnet/deprecated
Error: A newer Command Line Tools release is available.
Update them from Software Update in System Preferences or run:
softwareupdate --all --install --force
If that doesn't show you any updates, run:
sudo rm -rf /Library/Developer/CommandLineTools
sudo xcode-select --install
Alternatively, manually download them from:
https://developer.apple.com/download/more/.
You should download the Command Line Tools for Xcode 11.3.1.
第2部分参考：https://newsn.net/say/brew-install-php56.html
相关文章
http://blog.tvtvu.com/thread-413.htm
https://github.com/exolnet/homebrew-deprecated/pull/25
