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Flickr and PHP - Cal Henderson
This document summarizes Flickr's architecture and use of PHP. [1] Flickr uses PHP for its application logic and templating, with Smarty templating and PEAR libraries. [2] The logical architecture includes photo storage, databases, node services, application logic, page/API logic, and templates/endpoints. [3] PHP allowed Flickr to scale horizontally by making the application stateless and storing all data in databases.
