PHP创建Mysql数据库，然后给用户使用这个库的使用权限操作，如何实现？

mysql 创建一个用户 hail，密码 hail，指定一个数据库 haildb 给 hail

mysql -u root -p
password
use mysql;
insert into user(host,user,password) values('localhost','hail',password('hail'));
flush privileges;
create database haildb;
grant all privileges on haildb.* to hail@localhost identified by 'hail';
flush privileges;
如果想指定部分权限给用户

grant select,update on haildb.* to hail@localhost identified by 'hail';
flush privileges;
删除用户

delete from user where user='hail' and host='localhost';
flush privileges;
删除用户数据库

drop database haildb;
修改指定用户密码

update user set password=password('new_password') where user='hail' and host='localhost';
flush privileges;

这个是用mysql端设置的，如果你用来php开发环境有phpmyadmin的话，就在
phpmyadmin设置