There are several ways of doing this. Making subdomains are maybe the most widespread. But I found this much easier – and intuitive 
First, I added a couple of new hosts in /etc/hosts
127.0.0.1 localhost 127.0.0.2 alpha 127.0.0.3 beta 127.0.0.4 gamma
In /var/www, I added the folders alpha, beta, gamma containing index.php
<?php echo getcwd(); ?>
Then I added a new site in /etc/apache2/sites-availabe/
sudo nano greek # alpha <VirtualHost 127.0.0.2> DocumentRoot /var/www/alpha/ </VirtualHost> # beta <VirtualHost 127.0.0.3> DocumentRoot /var/www/beta/ </VirtualHost> # gamma <VirtualHost 127.0.0.4> DocumentRoot /var/www/gamma/ </VirtualHost>
And finished of with:
sudo a2ensite greek sudo /etc/init.d/apache2 reload
firefox alpha now showed /var/www/alpha
This was first published here.
