If your server supports PHP you don’t need to do anything.
Just create some .php files in your web directory, and the server will parse them for you. Because it is free, most web hosts offer PHP support.
However, if your server does not support PHP, you must install PHP.
Here is a link to a good tutorial from PHP.net on how to install PHP5: http://www.php.net/manual/en/install.php

Download PHP

Download PHP for free here: http://www.php.net/downloads.php

Download MySQL Database

Download MySQL for free here: http://www.mysql.com/downloads/index.html

Download Apache Server

Download Apache for free here: http://httpd.apache.org/download.cgi

Web Development is a process of developing website. It includes web designing , client/server side scripting , web server & security.

PHP is a server side scripting language &  is used to create dynamic &  interactive web site.

The term server side side scripting language means that the whole processing is done at server and finally the output is rendered at client whereas client side scripting language like javascript  runs at client side.

When browser returns web page,what actually happening at back-end is, it is actually in HTML format because browser only understand HTML.

PHP Basics before you start your PHP mission you need to see how php cycle works.

First of all let’s talk about PHP life cycle. Is it easy? You will come to know it here.  Now look at these terms.

• Parsing: Group of tokens are collected into simple meaningful expressions
• Compilation : Expressions are translated into instructions (Opcode)
• Scanning : The human readable source code is turned into tokens
• Execution : Opcode stacks are processed (one opcode at a time) to perform the scripted tasks

PHP Facts :

PHP is not started by itself. When we start Apache, it starts PHP interpreter along with itself. PHP is linked to apache ( in general term we can say SAPI i.e. a server API.

Well, now we will be talking about PHP modules, and they are

• Core PHP : Core PHP is the module that handles the requests, filestreams, error handling and other such operations
• Zend Engine : Zend Engine is one which converts human readable code into machine understandable opcode/tokens
• Extension Layer : Extensions are a bunch of functions, classes, streams that are available to PHP to perform various tasks. For example as we need MySQL extension to connect MySQL database with PHP

Continued in Stage 2…