ASKER
PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.
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It does completely depend on how your users interact with your site. There is nothing wrong with your set up (and I'm assuming you meant Nginx for as a reverse-proxy page cache for auth'ed users).
Is there something your current architecture is not satisfying?