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.

When it comes to building websites you need to understand what you fundamentally wish to achieve. This should be front and center. This way you stay focused on your overall goal which will help you stay on track when it comes to research.

One thing a lot of people fail to remember when building a site is that you will need to effectively communicate with people. Sure you will be doing a lot of keyword research but behind those keywords are people who need something and you need to communicate with them.

The mechanics of the site will be based upon the keywords you choose. This will determine the navigation and overall theme of your site. Getting this right is really important. This will also help you to achieve good rankings on the search engines.

For effective keyword research you will need to visit multiple sites to determine how best you can position your new site. Everyone will tell you that you need low competition keywords with high volume searches - while this is sound advice it can be tuff to achieve but that does not mean that you should not do it.

Where I change the game a little is by starting with the article directories and looking for keywords with articles that achieve high number of page views, this way I know I can write an article and get immediate quality traffic without having to wait for the search engines.

This can bring you advertising revenue and sales. When it comes to building the site itself there are lots of site building software out there. The one I had the most success with starting out helped me to get into the search engines and took care of hosting and good link development along with a solid site structure.

To learn how you can put this work for you select any of the following links.

How's your website, then?

I'm not asking whether it's a good site or not, but what its performance is like. Is it slow to load? Does it have problems with certain web browsers? Occasionally you'll find that code working perfectly on, say Internet Explorer, doesn't work with Firefox. And vice-versa. Any coding problems?

How should I know? Who... who cares? I hear you ask.

Because it's important. You only have seconds -- tenths of seconds, even -- to make an impression on people who come to your site. If the site isn't working, has dead links or some old code that doesn't work and leaves the site with blank areas, you can bet your life those lovely, potential customers will click away at the drop of a pixel. And more than likely they'll be clicking away to the welcoming site of one of your competitors.

Wake up and smell the Mugicha! After reading this post you no longer have any excuses for not knowing. There's a website I often turn to when I want to see how my own site is doing, performance-wise. It makes for uncomfortable reading sometimes, because it doesn't hesitate to tell me stuff I don't particular want to hear -- the site's too heavy, too many images, too many elements, you've failed at life, you're a bad, bad person... et depressing cetera. But it's well worth it.

I have no connection whatsoever with the owners of the site and this isn't an affiliate link, so click in confidence. Here it is:

http://www.websiteoptimization.com/services/analyze/

Put in the full address of your website and have a look at what it says. Pretty eye-opening stuff, eh? You didn't realise it was that bad, did you?!

I'm not particularly interested in contacting the owners of the site to ask for their optimization services, but the results I get when I check my site are very interesting. Useful, too. Oh, and completely free. Check it out.