首先，我参考How to Install PHP 7.0 / 7.1 using HomeBrew on Mac Big Sur用exolnet/homebrew-deprecated 这个源装置失败了

/bin/sh ./config.sub -apple-darwin20.2.0 failed

多方查找如果，最初应用shivammathur/php装置胜利了

装置php7.1

$brew tap shivammathur/php$brew search php==> Formulaebrew-php-switcher ✔            php@7.2                        phpmd                          shivammathur/php/php           shivammathur/php/php@7.2php                            php@7.3                        phpmyadmin                     shivammathur/php/php@5.6       shivammathur/php/php@7.3php-code-sniffer               php@7.4 ✔                      phpstan                        shivammathur/php/php@7.0       shivammathur/php/php@7.4 ✔php-cs-fixer                   phplint                        phpunit                        shivammathur/php/php@7.1     shivammathur/php/php@8.1==> Caskseclipse-php                                         netbeans-php                                        phpstorm$brew install php@7.1

切换版本

装置brew-php-swither切换工具

$brew install brew-php-switcher==> Downloading https://github.com/philcook/brew-php-switcher/archive/v2.2.tar.g==> Downloading from https://codeload.github.com/philcook/brew-php-switcher/tar.#=#=-#  #                                                                     ==> Installing brew-php-switcher ????  /usr/local/Cellar/brew-php-switcher/2.2: 6 files, 11.0KB, built in 4 seconds$brew install php@7.1

brew切换php版本

$brew-php-switcher 7.1Switching to php@7.1Switching your shellUnlinking /opt/homebrew/Cellar/php@7.1/7.1.33... 0 symlinks removedUnlinking /opt/homebrew/Cellar/php@7.4/7.4.14_1... 25 symlinks removedLinking /opt/homebrew/Cellar/php@7.1/7.1.33... 25 symlinks createdIf you need to have this software first in your PATH instead consider running:  echo 'export PATH="/opt/homebrew/opt/php@7.1/bin:$PATH"' >> ~/.zshrc  echo 'export PATH="/opt/homebrew/opt/php@7.1/sbin:$PATH"' >> ~/.zshrcYou will need sudo power from now onSwitching your apache confRestarting apacheAll done!

环境变量

$echo 'export PATH="/opt/homebrew/opt/php@7.1/bin:$PATH"' >> ~/.zshrc$echo 'export PATH="/opt/homebrew/opt/php@7.1/sbin:$PATH"' >> ~/.zshrc$source .zshrc $php -vPHP 7.1.33 (cli) (built: Dec 25 2020 07:27:59) ( NTS )Copyright (c) 1997-2018 The PHP GroupZend Engine v3.1.0, Copyright (c) 1998-2018 Zend Technologies    with Zend OPcache v7.1.33, Copyright (c) 1999-2018, by Zend Technologies

装置mongodb扩大

$sudo pecl install mongodb………………Build process completed successfullyInstalling '/opt/homebrew/Cellar/php@7.1/7.1.33/pecl/20160303/mongodb.so'install ok: channel://pecl.php.net/mongodb-1.9.0Extension mongodb enabled in php.ini$php -i | grep mongomongodb