Ubuntu PHP 致命错误：调用 PHP 脚本时调用未定义的函数 mysqli_connect() in..
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Ubuntu PHP Fatal error: Call to undefined function mysqli_connect() in.. when calling PHP script
提问by jt123
I run Ubuntu desktop 14.04LTS (Trusty Tahr), and I am trying to setup Apache 2, MySQL server and PHP, but I keep gettin the following error:
我运行Ubuntu 桌面 14.04LTS (Trusty Tahr)，并且我正在尝试设置 Apache 2、MySQL 服务器和 PHP，但我不断收到以下错误：
PHP Fatal error: Call to undefined function mysqli_connect() in..
PHP 致命错误：调用未定义的函数 mysqli_connect() in..
What I have done is these changes in the correct php.ini:
我所做的是在正确的 php.ini 中进行了这些更改：
uncomment:
取消注释：
extension=msqli.so
扩展名=msqli.so
set path aquired from phpinfo():
设置从 phpinfo() 获取的路径：
extension_dir = "./usr/lib/php5/20121212+lfs"
extension_dir = "./usr/lib/php5/20121212+lfs"
Why is the mysqli function to connect to the database still undefined?
为什么连接数据库的mysqli函数还是undefined？
回答by syyu
In my case php5-mysql was missing from my Ubuntu server. After installing the package it is working fine with mysqli adapter.
在我的情况下，我的 Ubuntu 服务器中缺少 php5-mysql。安装软件包后，它可以与 mysqli 适配器一起正常工作。
sudo apt-get install php5-mysql
It resolved my CodeIgniter 3.0 mysqli connection valid.
它解决了我的 CodeIgniter 3.0 mysqli 连接有效。
回答by Andrew
running updates is usually recommended
通常建议运行更新
sudo apt-get update
then install needed version
然后安装需要的版本
sudo apt-get install php5-mysql
sudo apt-get install php7.0-mysql
sudo apt-get install php7.1-mysql
sudo apt-get install php7.2-mysql
restart apache
重启阿帕奇
sudo service apache2 restart
