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[SOUND] Hi, I'm Alena, developer,
teacher and lifelong learner.

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Let me be the first to welcome
you to the PHP community.

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PHP is one of the most widely used
technologies on the Internet today.

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I'm almost certain that you've heard of at
least one of the many projects built on

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PHP, such as WordPress, Drupal,
Wikipedia or Facebook.

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A conservative estimate is that
25% of the web is built on PHP.

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PHP started as a personal project for
Rasmus Lerdorf for

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the maintenance of his personal webpage.

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At the beginning, PHP was an abbreviation
for personal home page tools.

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As in PHP tools.

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In 1995 these PHP tools were
released to the world and

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other developers learned about it and
started to use it.

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Two programmers Andy Goodman and

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Steve Zeroski really liked PHP but they
found it inefficient and lacking features

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they needed to power an e-commerce
application that they were developing.

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They began collaborating with
Rasmus in the development of a new

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independent programming language.

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This entirely new language
was simply called PHP and

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now stands for PHP hypertext preprocessor.

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As an open source project, PHP has
a core team of around ten developers.

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It also has other contributors that help
with quality assurance, documentation, and

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suggestions for
bug fixes and improvements.

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Besides the PHP core,
there are also many frameworks and

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packages that you can use to add
functionality to your programs.

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With so many people using PHP and

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contributing to the community
the language continues to flourish.

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PHP turned 20 years old in 2015 and
also saw the release of PHP seven.

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This major rewrite more than doubled
the speed of the previous version.

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The driving force behind PHP has
always been to solve a problem, and

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make things easier to do.

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To that end there's no
complicated installation

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as most servers come
pre-installed with PHP.

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It's also easy to use
PHP to create a website.

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You can embed PHP code
directly into your HTML

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by using code blocks then immediately
preview the results in your browser.

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There's no need to compile your PHP code,
as with some other languages.

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So you can get up and running quickly.

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PHP is a great choice for creating simple
yet powerful websites and applications.

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PHP is a server side
language. Simply defined,

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a server side language is one where
the code is processed on the web's server.

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This server receives a request from
a client, processes that script on

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the server, and then returns the results
as an HTML response to the client machine.

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In other words,
the server sends back plain HTML.

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Just like the kind you would write
by hand to create a webpage.

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Your web browser is the client.

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So if you view the source code of a PHP
file in a web browser, you should not see

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any PHP code only the HTML that the server
outputs after processing the PHP program.

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In this course, I'm going to walk you
through the basics of the language

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ranging from simple
statements to conditionals.

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We'll be creating a simple unit converter
as well as a daily exercise program.

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We'll then finish up by using
those scripts on a webpage.

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I hope you're ready to get started
because I'm excited to introduce you to

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the fascinating world of PHP.