MySQL 4.0 with php-mysql rpm: Help!

[dapdrums]

Running
MySQL 3.23.58.1
php-mysql-3.23.58-1.i386

However, I need to be running the MySQL 4.0 version. Does an equivalent php-mysql library even exist? The mysql-shared library associated with MySQL 4.X seems to install libmysqlclient.so.12 and php-mysql-3.23.58-1 needs libmysqlclient.so.10.

thanks for any help.