13. mac php install

http://php.net/manual/zh/install.unix.apache2.php

https://www.zhihu.com/question/38869703/answer/80630212

https://wiki.php.net/phpng#how_to_download_build_install_and_test

http://lihuan.blog.51cto.com/4391550/821448

http://dengxi.blog.51cto.com/4804263/1748091

http://www.jianshu.com/p/ca60cf12f9c7

http://blog.sina.com.cn/s/blog_67cc58f40100nkbc.html

http://www.mylinuxguide.com/apache-is-running-a-threaded-mpm-but-your-php-module-is-not-compiled-to-be-threadsafe/

https://xdebug.org/wizard.php

https://github.com/Homebrew/homebrew-php

brew uninstall http  // 卸载