Functions are used to perform a well defined task that is normally repeated at various places within a web site, web application, or other software application. The function sometimes needs certain information before performing its task, and sometimes returns a value to the calling page or program.

An example of how to use a simple function in PHP:

 function showMessage() {
echo "{$_SESSION["message"]}"; }

The above example shows a very simple function that displays the contents of a session variable called 'message'. The idea being that while a user is using a web site, etc, various messages are generated and stored in the 'message' session variable. Whenever the showMessage function is called, the contents of the session variable are displayed. So, for example, when the user logs on, you could display a message saying that they have done so. Likewise, when they log off, a different message could be displayed.

Calling a function

To call the showMessage function, you would just need to include the line:

showMessage()

in the web page (wrapped in php tags to distinguish it from normall HTML).

Passing values to a function

Often, a function requires one or more input values in order to perform its task. For example, take the following example that takes two numbers as input, and adds them together. The result is then returned to the calling web page or program.

function addNumbers($number1,$number2) {
$answer = $number1 + $number2;
return $answer; }

In the calling program we would have something similar to the following:

$number1 = "5";
$number2 = "6";
$sumOfNumbers = addNumbers($number1,$number2);
echo "$sumOfNumbers";

Obviously, in a real program you would not have the numbers hardcoded like this, but they would be obtained from user input or by some other means. Notice also that although the name of the returned variable is $answer, the calling program makes no reference to that. We could, if we wanted to, change the calling program to:

$answer = addNumbers($number1,$number2);
echo "$answer";

which might make things slightly easier to understand.

The concept of web development may include more than a singular ecommerce website.

I have talked about the subject of web development in light of positively constructing a website. I've also talked about the mentality needed to envision the entire site prior to launch so you have some idea of where you want to go. The goal also included the need for a plan for growth and site expansion.

This article looks at the subject from the point of view of a corporate office with a few satellite offices that support and expand the potential of the primary business.

In a brick and mortar store environment it is often true that a business will start in a singular location. As trust is built through longevity and commitment to quality and service the business grows. If the business does well the owner may decide to develop a second store in another city within the region of primary service and support. Other stores may be opened as a result of the ongoing success of the overall operation. The idea is multiple stores - one brand.

Web development may be the mirror image of the brick and mortar model. Why do I say mirror? Well, because in the case of an online environment an ecommerce business owner may be better served by starting with the secondary stores and building up to the primary online business portal.

If you're thinking, "That does seem backwards," allow me to explain.

These satellite stores should have direct links to your primary site. Each satellite may have its own emphasis, but will always relate to the thrust of your main business. The end goal remains the same, multiple stores - one brand.

Why develop more than one site?

In web development the idea of more than one site could mean improved site rankings for your primary site and additional opportunities to reach potential customers.

Think of it this way. Each satellite website you develop can take on a distinct list of keywords or phrases. Each will be associated with your primary product. All content on the site will be geared toward the specific keyword or phrase.

If you have four supporting sites that can go online at the same time as your primary site you have five distinct opportunities to reach consumers with your message. Work to optimize each site for search engines and select unique and researched keywords or phrases for each site.

Is that the only benefit?

By developing your web presence this way you begin the process with backlinks already in place from the satellite sites to your primary web presence. As your Search Engine Optimization (SEO) strategies begin yielding results they should do so in all five instances and ultimately this effort benefits your bottom line.

By having five separate sites that market the same product from a slightly different vantage point the potential improves for increased sales. This is true not just because there are more sites for consumers to view, but because search engines will connect with this scenario and provide improved rankings earlier.

Proper web development may include more than one site and more than one approach as the vehicle used to maximize the overall potential of the product or service being marketed.

You know when it comes to doing anything in life its all about implementation. Sure at this juncture you may be overwhelmed and a little confused about what to do. You may have lots of ideas but you just do not know where to start.

As a result you do not implement anything you just get confused and overwhelmed and then nothing happens. The first thing you need to do is identify your strengths. This is where you are going to begin.

When it comes to building a website you know that its core value is based upon the information it provides. Secondly that information needs to be organized logically. Then that information needs to make sense to your readers and also needs to be understood by the search engines.

So having good site structure will benefit all parties concerned. At this point you probably have something in mind about what you want to do online - in other words a subject that you want to build your site around.

If not you have some reason for wanting to build a site in the first place and that may be just to share it with friends and family or to make money.

Identify your ideas and write them down. Once you have cleared your mind then you will be in a far better position to move onto the next task.

The main thing is to understand the main structure of the internet and that is to provide information which can be delivered through multiple mediums such as video, audio, or straight content.

Then just make sure that you can deliver this effectively and you will have a solid foundation to build on.