关于 macos 下 PHP -v 和 PHP -fpm -v 版本不同的问题

我使用了macos10.13系统，用phpbrew来管理多版本 php，系统自带的 php 版本是 7.1.16 ，我用 phpbrew 下载来 php5.6 的版本，然后我用命令phpbrew switch 5.6切换了 php 版本，然后在终端下输入命令php -v

输出结果为：

PHP 5.6.30 (cli) (built: May 14 2019 18:30:16)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

输入命令php-fpm -v

输出结果为：

PHP 7.1.16 (fpm-fcgi) (built: Mar 31 2018 03:00:16)
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2018 Zend Technologies

web 页面输出phpinfo()也是 7.1.16

系统自带的php-fpm位置在/usr/sbin,我尝试把我下载的 php-fpm5.6 的替换到这里，页面就 404

nginx 报错为：

2019/05/15 18:35:48 [error] 3125#0: *51 kevent() reported that connect() failed (61: Connection refused) while connecting to upstream, client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1:82"
2019/05/15 18:35:48 [error] 3125#0: *51 open() "/usr/local/Cellar/nginx/1.15.12/html/50x.html" failed (2: No such file or directory), client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1:82"
2019/05/15 18:35:48 [error] 3125#0: *51 kevent() reported that connect() failed (61: Connection refused) while connecting to upstream, client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1:82"
2019/05/15 18:35:48 [error] 3125#0: *51 open() "/usr/local/Cellar/nginx/1.15.12/html/50x.html" failed (2: No such file or directory), client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1:82"
ailed (2: No such file or directory), client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1:82"
2019/05/15 18:48:03 [error] 3125#0: *64 kevent() reported that connect() failed (61: Connection refused) while connecting to upstream, client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1:82"
2019/05/15 18:48:03 [error] 3125#0: *64 open() "/usr/local/Cellar/nginx/1.15.12/html/50x.html" failed (2: No such file or directory), client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1:82"

html 解析的正常的，问题就出在 php-fpm，google 搜索两天也没解决，各位师傅可以帮我看看吗，我想让 php-fpm 变成 5.6 的