Understanding architecture and folder structure in Symfony2?

I'm completely new to Symfony 2 and i can't really understand the folder structure and开发者_运维知识库 organization of a project. I know what a bundle is, but what is unclear to me is:

• what's the main directory (the directory to be copied on the web server for deployment)
• where assets (css, javascript) should be placed
• if (and how) environment should be changed when publishing my website

I've already read the book on Symfony website and i can't find those answers.

• The web root of a Symfony2 app is the 'web' directory, but when you push to production the entire symfony2 project should be pushed not just the web root.

From the symfony2 book

app/: This directory contains the application configuration;
src/: All the project PHP code is stored under this directory;
vendor/: Any vendor libraries are placed here by convention;
web/: This is the web root directory and contains any publicly accessible files;

• The assets should be kept in the bundles 'Resources/public/[css/js/images]' folders. From here you would have to copy or symlink those directories into the web root to make them accessible. Symfony2 comes with a command line utility located in the 'app' directory. app/console assets:install web --symlink command executed from the command line of your symfony2 project root will install all of the bundle's assets for you.

• To change environments and you are using Apache you would use a .htaccess file and mod_rewrite to select which environment you would want to use

  RewriteEngine On 
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule ^(.*)$ /app.php [QSA,L]
  

  using /app.php puts me into production mode and using /app_dev.php would put me in development mode.

• The main directory contains the app folder.
• The assets should be placed in the bundles folder they're related to. This folder is named "public".
• Read this. All you need to do is remove the app_dev.php file.