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Your application stack
Data storage
Object model
Request controllers
Front controller / views
Web server
Edge cache
Load balancer
Network proxy
User agent (browser)
Firefox, Chrome, IE, Safari, Opera, Blackberry
ISP or corporate level, eg Squid
Edgecast, Amazon cloudfront, Akamai
Squid, Varnish, Nginx
Apache, IIS, Lighttpd
PHP script executed by web
server, template engine
PHP to handle this URI / request type
PHP for data access abstraction
MySQL, MongoDB, Postgresql, flatfile
Outside your
control
Your network
architecture
PHP app