Fatal error: Uncaught Error: Call to undefined function mysqli_connect()

• sudo apt-get install php7.2-mysql  //版本号肯能不一样
• sudo dpkg-reconfigure  php7.2-mysql
• sudo /etc/init.d/mysql restart
• sudo /etc/init.d/apache2 restart

原文：https://www.cnblogs.com/jiangfeilong/p/10561042.html