回退Mac上用Brew安装的PHP版本
昨天随手一点 brew upadte brew upgrade 后phpunit出现了各种F，细查下来原来是 php 5.5.17 的一个bug fix 引起的。为了暂时正常使用phpunit，只能回退php的版本。 版本切换方式 通过brew安装的php可以通过 brew link 和 brew unlink 来切换不同版本。 例如
昨天随手一点
brew upadte & brew upgrade后phpunit出现了各种F，细查下来原来是 php 5.5.17 的一个bug fix 引起的。为了暂时正常使用phpunit，只能回退php的版本。
版本切换方式
通过brew安装的php可以通过brew link和brew unlink来切换不同版本。
例如
brew list brew unlink php56 brew link php55
大版本可以用brew list来查，如果是小版本的话只能去/usr/local/Cellar/php55看了。这个时候使用php-version可以更方便一点。
安装php-version
php-version是一个帮助管理从brew安装的php版本切换的工具。
安装非常简单
brew install php-version
然后执行
source $(brew --prefix php-version)/php-version.sh && php-version 5
使用php-version
直接执行
php-version
就可以看到现有的版本，比如我自己的
$ php-version 5.5.15 * 5.5.16 5.5.17
然后使用以下命令切换即可
php-version 5.5.15
再看php的版本，已经切换好了。
原文地址：回退Mac上用Brew安装的PHP版本, 感谢原作者分享。
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