My VirtualDocumentRoot setup

httpd-vhosts.conf

<IfModule dir_module>
	DirectoryIndex index.html default.html index.php
</IfModule>

<IfModule mime_module>
	AddHandler php5-script .phtml
	AddHandler php5-script .php
</IfModule>

<VirtualHost *:80>
  UseCanonicalName Off
  VirtualDocumentRoot /Users/Josh/Server/vhosts/%0/httpdocs
  
  CustomLog "/Users/Josh/Server/logs/access_log.txt" combined
  ErrorLog "/Users/Josh/Server/logs/error_log.txt"

  <Directory "/Users/Josh/Server/vhosts/*/httpdocs">
    AllowOverride all

    RewriteEngine On
    RewriteBase /
  </Directory>

  LogLevel debug
</VirtualHost>