My useful Symfony virtual hosts file - covers Symfony 1 & 2 - means every subdirectory becomes a virtual host, leaving you just to put an entry in your hosts file.

httpd-vhosts.conf

Listen 80
NameVirtualHost *:80

<virtualhost *:80>
  ServerName sf1.dev
  ServerAlias *.sf1.dev
  UseCanonicalName Off
  VirtualDocumentRoot "/Users/simon/Developer/SF1Projects/%1/web"
  
  <directory "/Users/simon/Developer/SF1Projects/*/web">
    Allow from All
    Options FollowSymLinks ExecCGI

    <IfModule mod_rewrite.c>
      # Copied from Symfony's .htaccess, with RewriteBase enabled
    
      RewriteEngine On
      RewriteBase /
      
      RewriteRule ^$ index.html [QSA]
      RewriteRule ^([^.]+)$ $1.html [QSA]
      RewriteCond %{REQUEST_FILENAME} !-f

      RewriteRule ^(.*)$ index.php [QSA,L]
    </IfModule>
  </directory>
  
  <directory "/Users/simon/Developer/SF1Projects/*/web/sf">
    AllowOverride All
    Allow from All
   </directory>
</virtualhost>

<virtualhost *:80>
  ServerName sf2.dev
  ServerAlias *.sf2.dev
  UseCanonicalName Off
  VirtualDocumentRoot "/Users/simon/Developer/SF2Projects/%1/web"
  <directory "/Users/simon/Developer/SF2Projects/*/web">
    Options Indexes FollowSymLinks MultiViews
     AllowOverride None
     Order allow,deny
     allow from all
     <IfModule mod_rewrite.c>
         RewriteEngine On
         RewriteCond %{REQUEST_FILENAME} !-f
         RewriteRule ^(.*)$ /app.php [QSA,L]
     </IfModule>
   </directory>
</virtualhost>