我现在正在使用linux mint，apache2，mySQL 5.7，php 7.2。
我试图在我的本地服务器http://192.168.xxx.xxx/上执行基本的php登录网页，但是当我登录我的页面时，总会出现白页。
我尝试安装php mysqli扩展，所以我在终端上编写命令如下：
taylor@C10ud-9 ~ $ sudo apt-get install php-mysql
Reading package lists... Done
Building dependency tree
Reading state information... Done
php-mysql is already the newest version (1:7.0+35ubuntu6.1).
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
taylor@C10ud-9 ~ $ sudo apt-get install php-mysqlnd
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'php7.0-mysql' instead of 'php-mysqlnd'
php7.0-mysql is already the newest version (7.0.25-0ubuntu0.16.04.1).
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
taylor@C10ud-9 ~ $ sudo apt-get install php7.0-mysql
Reading package lists... Done
Building dependency tree
Reading state information... Done
php7.0-mysql is already the newest version (7.0.25-0ubuntu0.16.04.1).
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
taylor@C10ud-9 ~ $ phpenmod mysqli
WARNING: Module mysqli ini file doesn't exist under /etc/php/7.2/mods-available
WARNING: Module mysqli ini file doesn't exist under /etc/php/7.2/mods-available
但无法找到mysqli。