Any advantages of using nginx as a reverse proxy server in mainly php driven dynamic non-static webites?

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http://serverfault.com – My question is there any advantage using nginx as reverse proxy when most of the content is dynamically generated via php ? As far as i am concern the nginx is very useful in caching the static content into a cache and serving the multiple requests at once .. is this true ? or is there any other advantages of the running nginx as a reverse proxy in mostly php driven dynamic content websites ? (HowTos)