Debian 彻底删除 PHP 7.0
NextCloud 目录下执行 PHP，老是报错版本不对，可我明明安装了 PHP 7.2.3。后来发现原来是以前的 PHP 7.0 没卸载干净。
This version of Nextcloud requires at least PHP 7.1
You are currently running 7.0.33-0+deb9u6. Please update your PHP version.
NextCloud 目录下执行 PHP，老是报错版本不对，可我明明安装了 PHP 7.2.3。后来发现原来是以前的 PHP 7.0 没卸载干净。
This version of Nextcloud requires at least PHP 7.1
You are currently running 7.0.33-0+deb9u6. Please update your PHP version.