Clean URLs Nginx Rewrites - php

Question

After searching the interweb for hours and none of the "guides" working I turn to you guys and girls for help.
I am attempting to clean all my urls for all files in any directory so www.foo.com/foo.php becomes www.foo.com/foo.
Also I want to tidy up requests such as www.foo.com/foo.php?foo=foo to www.foo.com/foo/foo
Here is my current failed attempt:
server {
# Change these settings to match your machine
listen 80 default_server;
server_name example.com www.example.com;
# Everything below here doesn't need to be changed
access_log /var/log/nginx/example.access.log;
error_log /var/log/nginx/example.error.log;
root /var/www/example.com;
try_files $uri $uri/ #extensionless-php;
index index.html index.htm index.php;
location ~ \.php$ {
include /etc/nginx/fastcgi_params;
fastcgi_pass 127.0.0.1:9000;
# The next two lines should go in your fastcgi_params
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}
location #extensionless-php {
rewrite ^(.*)$ $1.php last;
}
location /phpmyadmin {
root /usr/share/;
index index.php index.html index.htm;
location ~ ^/phpmyadmin/(.+\.php)$ {
try_files $uri =404;
root /usr/share/;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include /etc/nginx/fastcgi_params;
}
location ~* ^/phpmyadmin/(.+\.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt))$ {
root /usr/share/;
}
}
location /phpMyAdmin {
rewrite ^/* /phpmyadmin last;
}
}
It works but I can still access the old .php url aswell which as far as im aware is bad for SEO? as its duplicate content?
Thanks in Advance
Danny