Introduction to PHP

PHP-Hypertext preprocessor

•It is an open source scripting language

•PHP scripts are executed on the server

PHP Files:

•PHP files can contain text, HTML, CSS, JavaScript, and PHP code

•PHP code are executed on the server, and the result is returned to the browser as plain HTML

•PHP files have extension ".php"

Purpose of PHP:

•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 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 server on your pc:

However, if your server does not support PHP, you must:

• install a web server(Apache,IIS etc)
• install PHP
• install a database, such as MySQL

The official PHP website (PHP.net) has installation instructions for Authenticated PHP link: http://php.net/manual/en/install.php

Sample PHP program:
PHP program starts with the following syntax:
<?php
//code
?>

//program 

<html>
<body>
<h1>My PHP</h1>
<?php
echo "Hai friends"
?>
</body>
</html>

NOTE:
Save the program with extension .php
The output is obtained only when we start the webserver and click the file name found on it.