I'm brand new to nginx and I am trying to convert the app I wrote over from Apache as I need the ability to serve a lot of clients at once without a lot of overhead! I'm getting the hang of setting up nginx and FastCGI PHP but I can't wrap my head around nginx's rewrite format just yet. I know you have to write some simple script that goes in the server {} block in the nginx config but I'm not yet familiar with the syntax. Could anyone with experience with both Apache and nginx help me convert this to nginx format? Thanks!

# ------------------------------------------------------ #
# Rewrite from canonical domain (remove www.)            #
# ------------------------------------------------------ #

    RewriteCond %{HTTP_HOST} ^www.domain.com
    RewriteRule (.*) http://domain.com/$1 [R=301,L]

# ------------------------------------------------------ #
# This redirects index.php to /                          #
# ------------------------------------------------------ #

    RewriteCond %{THE_REQUEST} ^[A-Z]+\ /(index|index\.php)\ HTTP/
    RewriteRule ^(index|index\.php)$ http://domain.com/ [R=301,L] 

# ------------------------------------------------------ #
# This rewrites 'directories' to their PHP files,        #
# fixes trailing-slash issues, and redirects .php        #
# to 'directory' to avoid duplicate content.             #
# ------------------------------------------------------ #

    RewriteCond %{DOCUMENT_ROOT}/$1.php -f
    RewriteRule ^(.*)$ $1.php [L]

    RewriteCond %{DOCUMENT_ROOT}/$1.php -f
    RewriteRule ^(.*)/$ http://domain.com/$1 [R=301,L]

    RewriteCond %{THE_REQUEST} ^[A-Z]+\ /[^.]+\.php\ HTTP/
    RewriteCond %{DOCUMENT_ROOT}/$1.php -f
    RewriteRule ^([^.]+)\.php$ http://domain.com/$1 [R=301,L]

# ------------------------------------------------------ #
# If it wasn't redirected previously and is not          #
# a file on the server, rewrite to image generation      #
# ------------------------------------------------------ #

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d 
    RewriteRule ^([a-z0-9_\-@#\ "'\+]+)/?([a-z0-9_\-]+)?(\.png|/)?$ generation/image.php?user=${escapemap:$1}&template=${escapemap:$2} [NC,L]