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PHP Introduction
PHP code is executed on the server.

What You Should Already Know
Before you continue you should have a basic understanding of the following:

HTML
CSS
JavaScript
If you want to study these subjects first, find the tutorials on our Home page.

What is PHP?
PHP is an acronym for “PHP: Hypertext Preprocessor”
PHP is a widely-used, open source scripting language
PHP scripts are executed on the server
PHP is free to download and use
PHP is an amazing and popular language!

It is powerful enough to be at the core of the biggest blogging system on the web (WordPress)!
It is deep enough to run large social networks!
It is also easy enough to be a beginner’s first server side language!

What is a PHP File?
PHP files can contain text, HTML, CSS, JavaScript, and PHP code
PHP code is executed on the server, and the result is returned to the browser as plain HTML
PHP files have extension “.php”
What Can PHP Do?
PHP can generate dynamic page content
PHP can create, open, read, write, delete, and close files on the server
PHP can collect form data
PHP can send and receive cookies
PHP can add, delete, modify data in your database
PHP can be used to control user-access
PHP can encrypt data
With PHP you are not limited to output HTML. You can output images or PDF files. You can also output any text, such as XHTML and XML.

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Why PHP?
PHP runs on various platforms (Windows, Linux, Unix, Mac OS X, etc.)
PHP is compatible with almost all servers used today (Apache, IIS, etc.)
PHP supports a wide range of databases
PHP is free. Download it from the official PHP resource: http://www.php.net
PHP is easy to learn and runs efficiently on the server side
What’s new in PHP 7
PHP 7 is much faster than the previous popular stable release (PHP 5.6)
PHP 7 has improved Error Handling
PHP 7 supports stricter Type Declarations for function arguments
PHP 7 supports new operators (like the spaceship operator: <=>)

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