Virtual host definition:

location / {
  try_files $uri $uri/ =404;
}
location ~ \.php$ {
  try_files $uri =404;
  fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  include fastcgi_params;
  fastcgi_pass unix:/var/run/php5-fpm.sock;
  fastcgi_max_temp_file_size 0;
}

NOTE: change version of sock file to match version of php installed.