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PHP Complete Download and Install Guide

Official Overview

PHP is a popular general-purpose scripting language that is especially suited to web development. Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.

PHP code may be embedded into HTML code, or it can be used in combination with various web template systems, web content management systems, and web frameworks. PHP code is usually processed by a PHP interpreter implemented as a module in the web server or as a Common Gateway Interface (CGI) executable.

The web server combines the results of the interpreted and executed PHP code, which may be any type of data, including images, with the generated web page. PHP code may also be executed with a command-line interface (CLI) and can be used to implement standalone graphical applications.

The standard PHP interpreter, powered by the Zend Engine, is free software released under the PHP License. PHP has been widely ported and can be deployed on most web servers on almost every operating system and platform, free of charge.

PECL For Windows PECL extensions for Windows is being worked on. Windows DLL can be downloaded right from the PECL website.

PHP Functions

PHP defines a large array of functions in the core language and many are also available in various extensions; these functions are well documented in the online PHP documentation.

Custom functions may be defined by the developer:

// define a function, this one is named “myAge”
function myAge(Int $birthYear) : String {

// calculate the age
$yearsOld = date(‘Y’) – $birthYear;

// return the age in a descriptive form
return $yearsOld . ‘ year’ . ($yearsOld != 1 ? ‘s’ : ”);
}

// Next, output the text concatenated
// with the return value of myAge()
// As the result of the syntax “myAge()”, the myAge function is called.
echo ‘I am currently ‘ . myAge(1995) . ‘ old.’;