PHP / PHP Introduction

PHP means Hypertext Preprocessor (earlier name is Personal Home Pages.) is an open source general-purpose programming language originally designed for web development. It is a server scripting language and is used making Static and dynamic (interactive) Web pages.

Its code is processed by a PHP interpreter implemented as a module in a 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 can be used for many programming tasks outside of the web context, such as standalone graphical applications and robotic drone control.

Script Languages
1. Script is a set of instruction used to perform certain task either on client side / server side.
2. PHP is a server side scripting language.
3. Client interacts with server with the help of software called as browser.
4. Server interacts with the database with the help of software called as server software.
5. In 3 tier architecture client, server and database are having their own software’s.

Types of Scripting Languages
Client Side Server Side

Examples
1. JavaScript.
2. VBScript.
3. Jscript.
4. WML Script. e.t.c
Examples
1. PHP.
2. .NET.
3. JAVA.
4. Ruby on rails. e.t.c

3 Tier Architecture
three Tier Architecture


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