在安裝phpthink時報錯

SQLSTATE[HY000] [2000] mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication. Please use an administration tool to reset your password with the command SET PASSWORD = PASSWord('your_existing_password'). This will store a new, and more secure, hash value in mysql.user. If this user is used in other scripts executed by PHP 5.2 or earlier you might need to remove the old-passwords flag from your my.cnf file

原因：使用高版本mysql數(shù)據(jù)庫導入了低版本數(shù)據(jù)引起的，其中高版本數(shù)據(jù)庫的password hashes 是41位的hashes，而低版本數(shù)據(jù)庫的數(shù)據(jù)存儲的root 的password是16位的hashes，需要修改user表的password字段數(shù)據(jù)為41為的hashes。

解決辦法：

use mysql；    // 進入存儲user表的數(shù)據(jù)庫

set session old_passwords=0;   //修改session使用41位hashes（16為1，41的為0）

select password('root');   //查看你的password函數(shù)是否可以生成41位的hashes

set password for 'root' @'localhost' = password('root');   //使用password函數(shù)修改你的root密碼為41的hashes