我需要建立PHP4环境结合mysql5，当我尝试连接mysql时遇到这个问题。
谢谢你的任何踪迹。
The solution http://chrisjean.com/2010/05/25/fix-php-4-client-does-not-support-authentication-protocol/就是利用MySQL的OLD_PASSWORD函数来更新数据库用户的密码。例如：
[chris@office ~]$ mysql -u root -p mysql
Enter password:
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 267
Server version: 5.1.41-3ubuntu12.1 (Ubuntu)
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use mysql;
Database changed
mysql> update user set Password=OLD_PASSWORD('password') WHERE User='username';
Query OK, 0 rows affected (0.02 sec)
Rows matched: 0 Changed: 0 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql>
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