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[MUSIC]

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In this section we are going to focus on
the concept of sharing code

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between multiple developers.

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There are concepts such as auto loading,
name spaces, and

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file structures that help make all of this
possible.

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Then there are tools such as Composer
which handle dependency management.

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Depending on code from other developers
means you need a way to

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handle those dependencies.

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Which is a bit more robust than
downloading zip files and

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copying things around.

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Composer lets you do this.

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So why would you want to use somebody
else's code?

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If you're doing something very common but

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quite complex, like interacting with a
popular API, integrating with oAuth, or

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doing image manipulation, then you might
benefit from using an existing package.

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Popular code packages exist for a lot of
these problems, and

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they have been battle tested by hundreds
or thousands of other users.

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They might have features that you haven't
considered yet, or

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cater to edge cases that you have not yet
discovered.

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And generally, they'll help you get your
job done much more quickly.

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Thanks to Composer and

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Packagist, PHP has more high quality
packages than it's ever had before.

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The majority of them use name spaces and

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auto loading to make interacting with them
incredibly easy.

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Let's look how you can use Composer to
install code from third party

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developers so you can spend more time
working on something awesome.