mysql数据库问题（php）

Warning: mysql_connect() [function.mysql-connect]: Client does not support authentication protocol requested by server; consider upgrading MySQL client in D:\web\hengjie\conn.php on line 3

Warning: mysql_select_db() [function.mysql-select-db]: Client does not support authentication protocol requested by server; consider upgrading MySQL client in D:\web\hengjie\conn.php on line 4

Warning: mysql_select_db() [function.mysql-select-db]: A link to the server could not be established in D:\web\hengjie\conn.php on line 4

答案：
有两种可能：1) 如果你的php的服务器和mysql服务器不在一个机器上，那有可能就是php服务器的mysql版本太低了，最好升级到与mysql服务器版本一致 2) 如果两者在一台机器上，那就要用OLD_PASSWORD对mysql库中user表里面的password重新复位一下：
mysql>SET PASSWORD FOR 'some_user'@'some_host' = OLD_PASSWORD('newpwd');
D:\web\hengjie\conn.php 这个文件的第三行出错了