mysqlnd cannot connect to MySQL 4.1+ using the...

mysql数据库提示错误！

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

用这一个很好的方法，把密码改过。就OK了

SET PASSWORD FOR username@"%" = PASSWORD('123456');