CSS
CSS (Cascading Style Sheet) is a computer language used to represent file styles such as HTML (an application of Standard Markup Language) or XML (a subset of Standard Markup Language). CSS can not only modify web pages statically, but also format elements of web pages with various scripting languages dynamically.

What is PHP?
For PHP language, basic definition tells us PHP (full name of PHP: Hypertext Preprocessor, original name as “Personal Home Page”) is a open source scripting language. Meanwhile, PHP script is running and executing on the server. As a recognized and popular programming language, PHP is easy to learn for beginners, and also it provides so many advanced functions for senior programmers.Steel Pipe Suppliers

What is PHP file?
Normally we have to know what is PHP file after we have understood about its definition as hypertext pre-processor. Continue to read below,

 PHP files can contain text, HTML, JavaScript code, and PHP code
 PHP code is executed on the server and the results are returned to the browser in pure HTML form
 The default file extension for PHP files is “.php”

Why generally is PHP popular?
 PHP can run on different platforms (Windows, Linux, Unix, Mac OS X, etc.)
 PHP is compatible with almost all servers currently in use (Apache, IIS, etc.)
 PHP provides extensive database support
 PHP is free and can be downloaded from official PHP resources.

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