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Introduction & Overview of PHP

May17
2011 Written by mandar

PHP is a general-purpose scripting language originally designed for web development to produce dynamic web pages. For this purpose, PHP code is embedded into the HTML source document and interpreted by a web server with a PHP processor module, which generates the web page document. It also has evolved to include a command-line interface capability and can be used in standalone graphical applications. PHP can be deployed on most web servers and as a standalone interpreter, on almost every operating system and platform free of charge. PHP is installed on more than 20 million websites and 1 million web servers.

PHP was originally created by Rasmus Lerdorf in 1995. The main implementation of PHP is now produced by The PHP Group and serves as the de facto standard for PHP as there is no formal specification. PHP is free software released under the PHP License; it is incompatible with the GNU General Public License (GPL) due to restrictions on the usage of the term PHP.

While PHP originally stood for “Personal Home Page”, it is now said to stand for “PHP: Hypertext Preprocessor”, a recursive acronym.

After reading all the things written it’s natural for one to get attracted towards PHP.

Well, PHP is simple than other server side scripting.. If you are familiar with C,C++ , perl or Java  , it’s easy for you to understand PHP.

Most of the syntax are from C and java. Also, PHP started supported OOP programming since PHP 3.0 but it was improved in PHP 4.0 and finally the implementation of OOP in PHP was totally rewritten in PHP 5.0

Being open source it’s highly supported, also it’s open source. Most of the webs are written in PHP, Facebook is one of the popular website. So you can imagine how good PHP is.

So in next lesson we see basic things like getting PHP and all.

Installation of PHP Getting PHP

May17
2011 Written by mandar

For Windows Environment, getting PHP is very easy. Well we need a web server to run PHP files, PHP interpreter is with us, but it can’t run your WEB page directly by putting some address.

So it’s required for us to install a web server. I would recommend going for Apache Web Server for that purpose.

Don’t worry, you don’t need to install everything separately. There is a better way in Windows , to obtain PHP along with MySQL( database) , and Apache Server.

I would recommend Installing either WAMP server or XAMPP server for the PCs running with Windows Operating system.

You can get it from following Links:

Note: Download only one the two, I will suggest WAMP for new user. And all of the lessons ahead, I will be using WAMP.

WAMP Server downloads:

Download WAMP HERE

XAMPP Server downloads:

Download XAMPP here

So download one of these , and just install it :) , It’s installation is very simple, so I won’t show any pictures here.

In next lesson, we will write our first PHP script saying Hello World.

Hello World from PHP – First PHP Program

May17
2011 Written by mandar

Assuming that you have already installed WAMP or XAMPP server, we will proceed further.

Our first task is to print Hello World from php, i.e. just let the end user know something, that’s our task.

It’s very easy to do so, let’s write the code for it.

The Code for Hello World from PHP , would be like below:

You can write the code in Notepad , JEdit or any other editor.

<?php
echo "Hello World";
 
 
 
 
?>

As you can see, the statements in PHP are terminated by ” ; ” same as C,C++ or java.

Save this file with any name , you like.

I am saving it as first.php

You are supposed to save file in installation directory of WAMP or XAMPP. As i told earlier I am using WAMP , so According to my installation , I have saved file in

C:wampwwwphptut

In WAMP folder, www folder would be by default, I have created new folder with name phptut inside it. And saved my file with name as first.php.

You have to start WAMP server first, via,  start->Wamp server->start Wamp Server.

Then,

you can access page via

http://localhost/phptut/first.php

Output would be like:

Hello World from PHP

Hello World from PHP

 

 

 

 

 

 

 

 

 

What just happened??

Basically, when we request for PHP page, it’s parsed and output is sent to browser.

echo is defined by php, which can output strings.

So the thing which we pass in “” (double quotes) is printed straight a way.

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