PHP code is executed on the server.
What You Should Already Know
Before you continue you should have a basic understanding of the following front languages:
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 code is executed on the server, and the result is returned to the browser as plain HTML
- PHP files have extension
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 server-to-server 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, PDF files, and even Flash movies. You can also output any text, such as XHTML and XML.
- 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: www.php.net
- PHP is easy to learn and runs efficiently on the server side
What's new in last PHP 8.1
PHP 8.1 is a major update of the PHP language.
It contains many new features, including enums, readonly properties, first-class callable syntax, fibers, intersection types, performance improvements and more.
- Performance Improvements
- New Classes, Interfaces, and Functions:
- New Sodium XChaCha20 functions
PHP code example
An example of embedding PHP code in an HTML document:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Example</title> </head> <body> <?php echo "Hello world! - it's written with PHP"; ?> </body> </html>