服务器请求客户端未知的身份验证方法[caching_sha2_password]

Question

当我尝试连接数据库时，php向我显示此错误

$bdd=new PDO('mysql:host=localhost;dbname=php','root','Projet_');

我尝试过

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'Projet_';

但是它给了我mysql错误1805预期51在mysql.user中找到48