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As I mentioned in the last video,

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you've already started to work
with this separation of concerns.

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When you move the header and footer
of your website into separate files.

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Or, when you organize functions and
classes into an include folder.

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We're going to continue to separate
components in a clearly defined way.

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All applications functions in the same
basic way, regardless of whether

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this is a website or mobile app,
or even a voice activated device.

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The application takes in a request and

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returns a response,
this is called the request response cycle.

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The cycle may start with a request for

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a contact page on a website with
it's corresponding form response.

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A mobile app,
may request the weather information and

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respond with the weekly forecast.

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Or, you may ask Alexa to tell you a joke.

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This Ask/Tell, Request/Response cycle

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is handled by the controller
in an MVC application.

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We could build the entire
application ourselves.

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But being a programmer,

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is all about knowing how to use
the tools at your disposal.

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One of those tools is a framework.

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Developers saw the commonalities
between projects.

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And being in the business of solving
problems, wanted to make it faster and

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easier to get a project up and running.

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A framework in development is
much like framing a house.

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It's the underlying structure of
the application, or house, being built.

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Using a framework, can help us
build an application more rapidly,

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by giving us the basic
functionality right out of the box.

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It can also make it easier to
bring on new people to a project.

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Because new developers may be
familiar with the framework itself.

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Or at the very least,
have the documentation and

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community support
surrounding that framework.

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PHP gives us many different
frameworks to choose from.

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Each framework may be geared for
certain types of applications.

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And therefore,
come package with certain functionality.

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There are also micro frameworks,

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which are designed to be
a minimal approach to development,

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by giving you only the functionality most
commonly seen throughout any application.

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One of the dangers of using a framework,

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is that many things can happen
by what may seem like magic.

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Since we're going to build
a very basic site, and

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also because I don't want
you to be confused by magic.

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We're going to be using a micro
framework known as Slim.

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The goal of this course is not
to teach you to use Slim, but

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to introduce you to the concept
of MBC frameworks in general.

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This will prepare you to use any
framework you may encounter.

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All reputable frameworks, we use
a standard dependency management tool.

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For PHP that tool is Composer.

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If you need more information about
setting up or using Composer,

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check the notes associated
with this video.

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In the next video,
we'll be using Composer and

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setting up a minimum website using
a controller with Slim Framework.