I want to auto_prepend a php file based on the virtual host name

<VirtualHost *:80>
ServerName dev.inflash.com
ServerAlias dev.inflash.com
DocumentRoot /var/www/public_html/inflash
</VirtualHost>

How would I get a preloaded php loaded into that virtualhost alone?

As is now, I set auto_prepend in php.ini to load a file, but I don't want it for every virtual host.