Java and PHP run in virtual machines, which means that neither perform as well as compiled C or C++. In the great language shootout, Java beat PHP on most of the performance benchmarks, even substantially on some.
There are three basic web architectures
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Two-Tier Architecture
A two-tier application web application has one tier for the display and application logic, connected to a second tier, which is the database server. Two-tier web applications perform best because they require the least processing for a single request
Three-Tier Architecture
A three-tier architecture separates the display and application logic into two separate tiers. To the left, a physical three-tier architecture puts the three tiers onto three separate machines or processes. To the right, a logical three-tier architecture has the application and business logic layer together in one process, but still divided by an API layer.
a J2EE web server application architecture. Externally to the Java community, the application structure looks clear: JSPs talk to EJBs, which talk to the database. Within the Java community, the standard J2EE topology is anything but clear. A comparison is only valid between two things, so to decide whether \"Java scales and PHP doesn\'t,\" I need to be clear about what a Java web application server is.
PHP Web Server Architecture
PHP has always been capable of running the gamut between a two-tier architecture and a logical three-tier architecture. Early versions of PHP could abstract the business and database access logic into a functional second tier. More recent versions can abstract the business logic with objects, and with PHP 5, these objects can use public, protected, and private access control.
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