What Is PHP?

The full form of PHP is Hypertext PreProcessor and is a server-side scripting language. The PHP code can be combined with regular HTML tags and parsed on the server. The creator of PHP, Rasmus Lerdorf first displayed the language in the form of a Perl script . In 1997 it was adapted by Andi Gutmans and Zeev Suraski to use a C-written compiler. They completely reconstructed the original PHP into the web language that we know and use today.

Uses of PHP

It is used in the creation of dynamic web pages. Web developers like it because of its fast parsing and flexibility and versatility. PHP is a popular tool for managing a form's data after it is submitted and comes built in with many different interfaces and API's. It has database capability built into the language, the most common database being MySQL. Typically the PHP can connect to any SQL enabled database.

The Syntax of PHP is similar in structure to Perl and C where curly braces { } define blocks of code and semi-colons specify the end of a statement PHP is as easy to learn as Perl. It maintains all the traditional loops, if/else, and subroutines that are expected in a programming language. One difference between the two is that the code'?' is embedded in with the HTML; you could however, use a separate file. The PHP code is different from HTML code by use of the opening and closing tags. When it finds a PHP file, it tells the server to scan through for these tags, and execute the code in between them. The server recognizes a PHP enabled file by its extension, .php. These are essentially HTML files with PHP codes in them.

Getting Started

To start PHP requires a server with PHP installed and a simple ASCII text editor such as Notepad or VI, eMacs, Kate, etc. for a UNIX/Linux machine.

What are the problems faced by PHP?

It is case sensitive. For example if you name a variable $MyVar, you cannot call it as $myvar or $mYvAr. In case you forget to close your curly brackets, then it helps to indent lines inside the curly braces so that any missing braces can be spotted easily.

What is PHP?

PHP stands for PHP: HyperText Preprocessor, it is a server-side scripting language, and as the name goes, it is to create dynamic and interactive Websites for your visitors. Maybe you currently make your Websites in HTML? HTML alone cannot create dynamic Web pages, HTML is clearly defined as a static language, as it is always static and mainly is used for structuring (or styling, in some cases) a document (or a Web page, if you like).

What do we mean by server-side scripting?

You may already know, but HTML is a client-side language, so the browser translates the HTML code into "bytecode" that the computer can understand, and so the computer translates bytecode into what we can clearly understand, text, for example. Server-side scripting is a little different, a little bit more added to the story. As with PHP, server-side scripting languages have an interpreter inside a machine, that translates the code (in our case, PHP code) to HTML code (that the browser can understand), and then the same process will take place with the browser translating the HTML code to bytecode, and so forth. With server-side scripting languages, you don't need anything adding to your browser or computer, as the interpreter inside the machine that hosts the particular Website does most of the work.

What's the fuss with server-side scripting languages, then?

The thing that makes server-side scripting a must nowadays is because it can generate dynamic Web pages, but what do we mean by dynamic Web pages? Well, imagine you wanted to start a forum, and you used HTML. Okay, you used a form to submit the data and it is sent to your e-mail address, and you have to edit the static Web page every time you want a new post added. That, to me, would be the most annoying job of creating a Website. However, with PHP (or any other server-side scripting language, for that matter), can be completely automated, and you'd not have to edit your file even once! The thing that PHP does, is sends the form data to a different page, saves it in "pre-defined" variables (things that store a value), and using something called a "while loop" that continually loops all the posts saved in the Web page - and that's it! PHP stores the posts in a MySQL database (something that holds data, if you like, like member accounts, etc) and uses that as long-term memory.

But if we're talking about server-side scripting languages, what makes PHP different from the rest? Well, simply put, PHP is probably the best thing that has come into the server-side scripting genre. If you have heard about other scripting languages like Perl or ASP/ASP.NET, you'll come to find that they are extremely hard to learn from. Put it this way, the majority of Web developers that use ASP.NET, for example, are those who have come from a different programming background, like have known VBScript, or other languages that's in relation to ASP.NET, the same with Perl. The difference between PHP and the rest, is PHP is incredibly easy to learn, especially for the newbies towards this industry, and PHP has took several steps to ensure an easy introduction to those newbies to the world of programming. Let's do an example, lets see which is the easiest to understand, out of PHP, VBScript and Perl, by doing a simple "Hello World" program, that outputs text to a Web page:

PHP:

echo "This is some text that'll be shown in a Web page...";

VBScript/ASP.NET:

Response.Write("This is some text that'll be shown in a Web page...");

Perl:

#!/usr/bin/perl

print "content-type: text/html nn";

print "This is some text that'll be shown in a Web page...";

Okay, now I am not going to say things like "well, obviously PHP is the easiest to understand" - as obviously, we all have different preferences, but what I can say is, that they all do the same thing. Which seems the most logical to you? In my opinion, the two most logical ones for me is PHP and VBScript/(ASP.NET).

Now it's up to you which one you want to go ahead with, experiment which one is best for you, after all, we all have dfferent tastes.

Good luck!

Below are a few resources to get started with PHP:

# - w3schools.com

# - php.net

# - mysql.com

In layman language Web 2.0 means the second generation of web development. The first generation web development is considered to be the great dot-com bubble of late 90's and the rupture of which around late 2001 triggered ubiquitous reactions that the Web was over hyped. Concept of second generation of Web development started after a media conference between O'Reilly and MediaLive International. In this brainstorming session it was realized that the web has thrown up more interesting applications and Web technology has emerged more important that ever and the word Web 2.0 was coined. Web 2.0 is a business revolution making a bent towards the web as a platform. Web 2.0 doesn't have a definite boundary and there are several things encompassing a core. Web 2.0 is visualized as principles and collection of numerous sites running on those principles at some distance from the core.

Since then Web 2.0 has remained a top level discussion for proper definition and boundary that is yet to be reached. One can simply say blogs, social bookmarking, wikis, podcasts, RSS feeds, and lightweight business over a single platform. Web is no more one way, now uploading, and downloading of information happens simultaneously, sharing and distributing contents across networks leveraging the power of "Long Tail".

Web 2.o includes numerous practices. Here are some typically implemented practices by websites:

• Well-off internet applications based on Flex or Ajax.
• This intend to allow information intended for end-users, such as contact information, calendar events, geographic coordinates, content life, social relationships etc
• Presentation is separated from content through Cascading Style Sheets (CSS).
• High-end APIs (Application programming interfaces).
• Content Syndication through RSS or Atom.
• Facility for content creation through users, also by machines from client side or server side.

Content Syndication: Syndicating partial or whole content through standard protocols such as RSS, Atom, and RDF by using XML so as to be used by the end-users for their need.

Some misconceptions on Web 2.0:

• Curvy designs (This curvy structures became widely popular at the same time, designers also started making more websites with this cool looking styles)
• Use of Ajax or Flex (Which happens to come in the same time of Web 2.0, No doubt that websites with web 2.0 architecture needs these to work well.)

Web 2.0 is not an alien to criticism and had its fair share. Here are some criticisms leveled at Web 2.0

• Web 2.0 is not a new version of World Wide Web at all. It merely uses the technologies and architectures of Web 1.0.
• Ajax is not substituting the HTML protocol; it's an additional layer over HTML.
• Blogs or social networking was features of Amazon.com since 1995 when the word called Web 2.0 dint exist. It's way more than only blogs and social networking.