安装PHP

• 安装更新与PHP证书安装

apt update && apt upgrade
apt install ca-certificates apt-transport-https 
wget -q https://packages.sury.org/php/apt.gpg -O- | sudo apt-key add -
echo "deb https://packages.sury.org/php/ buster main" | tee /etc/apt/sources.list.d/php.list

• 安装PHP

apt update
apt install php7.3
apt install php7.3-cli php7.3-common php7.3-curl php7.3-gd php7.3-json php7.3-mbstring php7.3-mysql php7.3-xml 

• 配置pdo(去掉注释)

nano /etc/php/7.3/apache2/php.ini
extension=pdo_mysql

安装MariaDB

1. 安装MariaDB
   apt install mariadb-server -y
2. 设置开机启动MariaDB
   systemctl enable mariadb.service
systemctl restart mariadb.service
3. 设置MariaDB权限与密码等

• 登陆MariaDB:无密码mysql -uroot有密码用mysql -uroot -p123456
• 显示数据库show databases;
• 选择数据库use mysql;
• 查询用户SELECT host,user,password from user;
• 设置密码set password for 'root'@'localhost' =password('123456');
• 远程连接设置grant all privileges on *.* to root@'%'identified by '123456';
• 如果是不是root则先新建用户
  create user '用户名'@'%' ip地址 by '密码'
  测试pdo代码(方便不懂的人使用修改,注意127.0.0.1与localhost有可能不一样!请修改mysql密码)

重启apache服务

systemctl restart apache2.service
```
以上完成相关设置