想当然的进来就是一行
$sudo pecl install xdebugpecl/xdebug requires PHP (version >= 7.2.0, version <= 8.0.99), installed version is 7.1.33No valid packages foundinstall failed查阅了一下xdebug的下载页，默认装置的xdebug3曾经不反对php7.1了。
php7.1只配装置xdebug2，依据在下载页查到的最初一个反对php7.1的版本是2.9.8
$sudo pecl install xdebug-2.9.8 downloading xdebug-2.9.8.tgz ...Starting to download xdebug-2.9.8.tgz (245,293 bytes)...................................................done: 245,293 bytesBuild process completed successfullyInstalling '/opt/homebrew/Cellar/php@7.1/7.1.33/pecl/20160303/xdebug.so'install ok: channel://pecl.php.net/xdebug-2.9.8Extension xdebug enabled in php.ini检查一下是否装置胜利
$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 Xdebug v2.9.8, Copyright (c) 2002-2020, by Derick Rethans with Zend OPcache v7.1.33, Copyright (c) 1999-2018, by Zend Technologies $php -m | grep debugxdebugXdebug