I remember making a stack overflow entry on something similar. Not worked with nginx of late but if this may help, here it is .
http://stackoverflow.com/questions/15423500/nginx-showing-blank-php-pages/25838675#25838675

On 24 August 2015 at 08:54, Allan Kibet via skunkworks <skunkworks@lists.my.co.ke> wrote:
Hi Guys,

I am trying to set up an nginx server that will run PHP on ubuntu 14.04. I have managed to work out the setup and it also runs PHP files well. However when adding a laravel project to my /usr/share/nginx/html directory I can only access the root path i.e. the index page only. All other pages are either returning a 406 or 404 error. I have really tried my best to research on the best configuration for the server however, internet forums aren't helping much. Kindly if you have managed to set-up one, please feel free to share tips. I am new with nginx.

Thanks

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Alex Nyika Omuyonga