symfony2 rewrite rules .htaccess app.php

Try this in your .htaccess file (inside the web directory):

<IfModule mod_rewrite.c>    Options +FollowSymlinks    RewriteEngine On    # Explicitly disable rewriting for front controllers    RewriteRule ^app_dev.php - [L]    RewriteRule ^app.php - [L]    RewriteCond %{REQUEST_FILENAME} !-f    # Change below before deploying to production    #RewriteRule ^(.*)$ /app.php [QSA,L]    RewriteRule ^(.*)$ /app_dev.php [QSA,L]</IfModule>

To improve upon whistlergreg's answer, I added a line so that the bundles folder is not broken. This will make sure external resources such as images are not broken.

<IfModule mod_rewrite.c>    Options +FollowSymlinks    RewriteEngine On    # Explicitly disable rewriting for front controllers    RewriteRule ^/web/app_dev.php - [L]    RewriteRule ^/web/app.php - [L]    # Fix the bundles folder    RewriteRule ^bundles/(.*)$ /web/bundles/$1  [QSA,L]    RewriteCond %{REQUEST_FILENAME} !-f    # Change below before deploying to production    #RewriteRule ^(.*)$ /web/app.php [QSA,L]    RewriteRule ^(.*)$ /web/app_dev.php [QSA,L]</IfModule>

You don't have enabled rewrite module. This code is executed if mod_rewrite.c is enabled. You must only enable mod_rewrite in apache2.http://www.unixmen.com/how-to-enable-and-disable-apache-modules/

For example in Ubuntu:

sudo a2enmod rewritesudo service apache2 restart