Set the default index page for Apache
To set a custom default index page for Apache, you would need to use the DirectoryIndex directive
E.g. set the default page to index.php
Add the following lines to the Apache configuration (httpd.conf)
DirectoryIndex index.php index.html
The meaning of above config: If index.php is found, use it as the default page, else, fall back to look for index.html.
Restart Apache to take effect
# apachectl -k graceful