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Merb is an MVC framework that is ORM-agnostic, JavaScript library agnostic, and template language agnostic, preferring plugins that add in support for a particular feature rather than trying to produce a monolithic library with everything in the core. In fact, this is a guiding principle of the project, which has led to third-party support for the ActiveRecord, DataMapper, and Sequel ORMs.

In addition, it means that the core code in Merb is kept simple and well organized. This has multiple benefits. It means it’s faster for one thing. It’s also easier to understand, maintain and extend.

Merb is already packed with good stuff; flexible routing, gem plugins, the provides API, part and mail controllers etc. To get a better idea check out the features.

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As of version 4.3.0, PHP supports a new SAPI type (Server Application Programming Interface) named CLI which means Command Line Interface. As the name implies, this SAPI type main focus is on developing shell (or desktop as well) applications with PHP. There are quite a few differences between the CLI SAPI and other SAPIs which are explained in this chapter. It’s worth mentioning that CLI and CGI are different SAPI’s although they do share many of the same behaviors.

The CLI SAPI was released for the first time with PHP 4.2.0, but was still experimental and had to be explicitly enabled with –enable-cli when running ./configure. Since PHP 4.3.0 the CLI SAPI is no longer experimental and the option –enable-cli is on by default. You may use –disable-cli to disable it.

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