n my site root directory. there are donghua.php and index.php. now, is there a way to use .htaccess file to let the visitor access my site .the default shows example.com/donghua.php. not example.com/index.php. thank you. the server is Apache.

ps:The user still can access example.com/index.php

i using
DirectoryIndex donghua.php
in the .htaccess. the default page is ok. but when i access example.com/index.php it redirect to example.com/donghua.php. if i forbid it redirect how do i do?