1. PHP - Hypertext Pre-processor
Scripting Language for Web Development

2. PHP is probably the most popular scripting
language on the web. It is used to enhance
web pages.
 Using PHP, you can do things like create
username and password login pages, check
details from a form, create forums, picture
galleries, surveys, and a whole lot more.


3. Script:

A “script” is a collection of program or sequence of
instructions that is interpreted or processed out by
another program rather than by the computer processor.


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Client-side
Server-side
In server-side scripting, (such as PHP, ASP) the script is
processed by the server Like: Apache, ColdFusion, ISAPI and
Microsoft's IIS on Windows, JSP, PHP,PERL, Tcl and Python.

Client-side scripting such as JavaScript runs on the
web browser.

4. PHP - Introduction
• PHP stands for PHP: Hypertext Preprocessor.
• Developed by Rasmus Lerdorf in 1994
• It is a powerful server-side scripting language for
creating dynamic and interactive websites.
• It is an open source software, which is widely used and
free to download and use.
• It is an efficient alternative to competitors such as
Microsoft's ASP.

5. What is PHP?

Used to generate dynamic web-pages.

PHP scripts reside between reserved PHP tags

This allows the programmer to embed PHP scripts
within HTML pages

Personal Home Pages(Old Definition)

An alternative explanation is that the initials come
from the earliest version of the program, which was
called Personal Home Page Tools

6. What is PHP (cont’d)

Interpreted language, scripts are parsed at run-time
rather than compiled beforehand

Executed on the server-side

Source-code not visible for client

‘View Source’ in browsers does not display the
PHP code

Various built-in functions allow for fast development

7. What does PHP code look like?

Structurally similar to C/C++

Supports procedural and object-oriented
paradigm (to some degree)

All PHP statements end with a semi-colon

Each PHP script must be enclosed in the reserved
PHP tag
<?php
…
?>

8. Introduction to PHP

PHP is perfectly suited for Web development and can be
embedded directly into the HTML code.

PHP is often used together with Apache (web server) on
various operating systems. It can be used with Microsoft's
IIS on Windows.

PHP supports many databases (MySQL, Informix, Oracle,
Sybase, Solid, PostgreSQL, Generic ODBC, etc.)

9. Introduction to PHP
What is a PHP File?
• PHP files have a file extension of
".php", ".php3", or ".phtml"
• PHP files can contain text, HTML tags and
scripts
• PHP files are returned to the browser as
plain HTML

10. Introduction to PHP
What you need to develop PHP
Application:
 Install Apache (or IIS) on your own
server, install PHP, and MySQL
OR
 Install
Wampserver2 (a bundle of
PHP, Apache, and MySql server) on your
own server/machine

11. Benefits of PHP

PHP is an open source software & costs nothing, it is free to
download and use.

PHP is a server-side scripting language and is used for websites
and web
applications.

PHP scripts are executed on the server.

PHP supports a wide range of databases.

PHP runs on various platforms like Linux, Windows, Unix etc.

PHP supports most web servers (for example Apache, IIS).

PHP converses with several network protocols.

12. What you need to get started with PHP





Before you can write and test your PHP scripts,
there's one thing you'll need - a server!
Fortunately, you don't need to go out and buy
one.
In fact, you won't be spending any extra money.
That's why PHP is so popular! But because PHP is
a server-sided scripting language, you either have
to get some web space with a hosting company
that supports PHP, or make your computer affect
that it has a server installed.
This is because PHP is not run on your PC - it's
executed on the server. The results are then sent
back to the client PC (your computer).

13. Contd.,
We're going to be using some software
called Wampserver.
 This allows you to test your PHP scripts on
your own computer.
 It installs everything you need, if you have
a Windows PC. We'll explain how to get it
installed in a moment, and where to get it
from.


14. Benefits of PHP

PHP is an open source software & costs nothing, it is free to
download and use.

PHP is a server-side scripting language and is used for websites
and web
applications.

PHP scripts are executed on the server.

PHP supports a wide range of databases.

PHP runs on various platforms like Linux, Windows, Unix etc.

PHP supports most web servers (for example Apache, IIS).

PHP converses with several network protocols.

15. How PHP is Processed

When a PHP document is requested of a server, the server will
send the document first to a PHP processor

Two modes of operation

Copy mode in which plain HTML is copied to the output

Interpret mode in which PHP code is interpreted and the
output from that code sent to output

The client never sees PHP code, only the output produced by
the code